Update prometheus/client_golang to v1.0.0 (#5682)

Signed-off-by: beorn7 <beorn@grafana.com>

cmd/promtool/main.go

@@ -348,7 +348,7 @@ func QueryInstant(url, query string, p printer) int {
 	api := v1.NewAPI(c)
 
 	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Minute)
-	val, err := api.Query(ctx, query, time.Now())
+	val, _, err := api.Query(ctx, query, time.Now()) // Ignoring warnings for now.
 	cancel()
 	if err != nil {
 		fmt.Fprintln(os.Stderr, "query error:", err)
@@ -408,7 +408,7 @@ func QueryRange(url, query, start, end string, step time.Duration, p printer) in
 	api := v1.NewAPI(c)
 	r := v1.Range{Start: stime, End: etime, Step: step}
 	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Minute)
-	val, err := api.QueryRange(ctx, query, r)
+	val, _, err := api.QueryRange(ctx, query, r) // Ignoring warnings for now.
 	cancel()
 
 	if err != nil {
@@ -462,7 +462,7 @@ func QuerySeries(url *url.URL, matchers []string, start, end string, p printer)
 	// Run query against client.
 	api := v1.NewAPI(c)
 	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Minute)
-	val, err := api.Series(ctx, matchers, stime, etime)
+	val, _, err := api.Series(ctx, matchers, stime, etime) // Ignoring warnings for now.
 	cancel()
 
 	if err != nil {

go.mod

@@ -48,7 +48,7 @@ require (
 	github.com/jackc/fake v0.0.0-20150926172116-812a484cc733 // indirect
 	github.com/jackc/pgx v3.2.0+incompatible // indirect
 	github.com/jmespath/go-jmespath v0.0.0-20160803190731-bd40a432e4c7 // indirect
-	github.com/json-iterator/go v1.1.5
+	github.com/json-iterator/go v1.1.6
 	github.com/jtolds/gls v4.2.1+incompatible // indirect
 	github.com/knz/strtime v0.0.0-20181018220328-af2256ee352c // indirect
 	github.com/lib/pq v1.0.0 // indirect
@@ -56,8 +56,6 @@ require (
 	github.com/mattn/go-runewidth v0.0.4 // indirect
 	github.com/miekg/dns v1.1.10
 	github.com/mitchellh/reflectwalk v1.0.1 // indirect
-	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
-	github.com/modern-go/reflect2 v1.0.1 // indirect
 	github.com/montanaflynn/stats v0.0.0-20180911141734-db72e6cae808 // indirect
 	github.com/mwitkow/go-conntrack v0.0.0-20161129095857-cc309e4a2223
 	github.com/oklog/run v1.0.0
@@ -68,9 +66,9 @@ require (
 	github.com/peterbourgon/g2s v0.0.0-20170223122336-d4e7ad98afea // indirect
 	github.com/petermattis/goid v0.0.0-20170504144140-0ded85884ba5 // indirect
 	github.com/pkg/errors v0.8.1
-	github.com/prometheus/client_golang v0.9.3
+	github.com/prometheus/client_golang v1.0.0
 	github.com/prometheus/client_model v0.0.0-20190129233127-fd36f4220a90
-	github.com/prometheus/common v0.4.0
+	github.com/prometheus/common v0.4.1
 	github.com/prometheus/tsdb v0.8.0
 	github.com/rlmcpherson/s3gof3r v0.5.0 // indirect
 	github.com/rubyist/circuitbreaker v2.2.1+incompatible // indirect

go.sum

@@ -181,8 +181,8 @@ github.com/jackc/pgx v3.2.0+incompatible/go.mod h1:0ZGrqGqkRlliWnWB4zKnWtjbSWbGk
 github.com/jmespath/go-jmespath v0.0.0-20160202185014-0b12d6b521d8/go.mod h1:Nht3zPeWKUH0NzdCt2Blrr5ys8VGpn0CEB0cQHVjt7k=
 github.com/jmespath/go-jmespath v0.0.0-20160803190731-bd40a432e4c7 h1:SMvOWPJCES2GdFracYbBQh93GXac8fq7HeN6JnpduB8=
 github.com/jmespath/go-jmespath v0.0.0-20160803190731-bd40a432e4c7/go.mod h1:Nht3zPeWKUH0NzdCt2Blrr5ys8VGpn0CEB0cQHVjt7k=
-github.com/json-iterator/go v1.1.5 h1:gL2yXlmiIo4+t+y32d4WGwOjKGYcGOuyrg46vadswDE=
+github.com/json-iterator/go v1.1.6 h1:MrUvLMLTMxbqFJ9kzlvat/rYZqZnW3u4wkLzWTaFwKs=
-github.com/json-iterator/go v1.1.5/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCVDaaPEHmU=
+github.com/json-iterator/go v1.1.6/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCVDaaPEHmU=
 github.com/jtolds/gls v4.2.1+incompatible h1:fSuqC+Gmlu6l/ZYAoZzx2pyucC8Xza35fpRVWLVmUEE=
 github.com/jtolds/gls v4.2.1+incompatible/go.mod h1:QJZ7F/aHp+rZTRtaJ1ow/lLfFfVYBRgL+9YlvaHOwJU=
 github.com/julienschmidt/httprouter v1.2.0 h1:TDTW5Yz1mjftljbcKqRcrYhd4XeOoI98t+9HbQbYf7g=
@@ -269,8 +269,8 @@ github.com/posener/complete v1.1.1/go.mod h1:em0nMJCgc9GFtwrmVmEMR/ZL6WyhyjMBndr
 github.com/prometheus/client_golang v0.9.1/go.mod h1:7SWBe2y4D6OKWSNQJUaRYU/AaXPKyh/dDVn+NZz0KFw=
 github.com/prometheus/client_golang v0.9.3-0.20190127221311-3c4408c8b829 h1:D+CiwcpGTW6pL6bv6KI3KbyEyCKyS+1JWS2h8PNDnGA=
 github.com/prometheus/client_golang v0.9.3-0.20190127221311-3c4408c8b829/go.mod h1:p2iRAGwDERtqlqzRXnrOVns+ignqQo//hLXqYxZYVNs=
-github.com/prometheus/client_golang v0.9.3 h1:9iH4JKXLzFbOAdtqv/a+j8aewx2Y8lAjAydhbaScPF8=
+github.com/prometheus/client_golang v1.0.0 h1:vrDKnkGzuGvhNAL56c7DBz29ZL+KxnoR0x7enabFceM=
-github.com/prometheus/client_golang v0.9.3/go.mod h1:/TN21ttK/J9q6uSwhBd54HahCDft0ttaMvbicHlPoso=
+github.com/prometheus/client_golang v1.0.0/go.mod h1:db9x61etRT2tGnBNRi70OPL5FsnadC4Ky3P0J6CfImo=
 github.com/prometheus/client_model v0.0.0-20180712105110-5c3871d89910 h1:idejC8f05m9MGOsuEi1ATq9shN03HrxNkD/luQvxCv8=
 github.com/prometheus/client_model v0.0.0-20180712105110-5c3871d89910/go.mod h1:MbSGuTsp3dbXC40dX6PRTWyKYBIrTGTE9sqQNg2J8bo=
 github.com/prometheus/client_model v0.0.0-20190115171406-56726106282f h1:BVwpUVJDADN2ufcGik7W992pyps0wZ888b/y9GXcLTU=
@@ -279,15 +279,13 @@ github.com/prometheus/client_model v0.0.0-20190129233127-fd36f4220a90 h1:S/YWwWx
 github.com/prometheus/client_model v0.0.0-20190129233127-fd36f4220a90/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
 github.com/prometheus/common v0.0.0-20181113130724-41aa239b4cce/go.mod h1:daVV7qP5qjZbuso7PdcryaAu0sAZbrN9i7WWcTMWvro=
 github.com/prometheus/common v0.2.0/go.mod h1:TNfzLD0ON7rHzMJeJkieUDPYmFC7Snx/y86RQel1bk4=
-github.com/prometheus/common v0.4.0 h1:7etb9YClo3a6HjLzfl6rIQaU+FDfi0VSX39io3aQ+DM=
+github.com/prometheus/common v0.4.1 h1:K0MGApIoQvMw27RTdJkPbr3JZ7DNbtxQNyi5STVM6Kw=
-github.com/prometheus/common v0.4.0/go.mod h1:TNfzLD0ON7rHzMJeJkieUDPYmFC7Snx/y86RQel1bk4=
+github.com/prometheus/common v0.4.1/go.mod h1:TNfzLD0ON7rHzMJeJkieUDPYmFC7Snx/y86RQel1bk4=
 github.com/prometheus/procfs v0.0.0-20181005140218-185b4288413d/go.mod h1:c3At6R/oaqEKCNdg8wHV1ftS6bRYblBhIjjI8uT2IGk=
 github.com/prometheus/procfs v0.0.0-20190117184657-bf6a532e95b1 h1:/K3IL0Z1quvmJ7X0A1AwNEK7CRkVK3YwfOU/QAL4WGg=
 github.com/prometheus/procfs v0.0.0-20190117184657-bf6a532e95b1/go.mod h1:c3At6R/oaqEKCNdg8wHV1ftS6bRYblBhIjjI8uT2IGk=
-github.com/prometheus/procfs v0.0.0-20190507164030-5867b95ac084 h1:sofwID9zm4tzrgykg80hfFph1mryUeLRsUfoocVVmRY=
+github.com/prometheus/procfs v0.0.2 h1:6LJUbpNm42llc4HRCuvApCSWB/WfhuNo9K98Q9sNGfs=
-github.com/prometheus/procfs v0.0.0-20190507164030-5867b95ac084/go.mod h1:TjEm7ze935MbeOT/UhFTIMYKhuLP4wbCsTZCD3I8kEA=
+github.com/prometheus/procfs v0.0.2/go.mod h1:TjEm7ze935MbeOT/UhFTIMYKhuLP4wbCsTZCD3I8kEA=
-github.com/prometheus/tsdb v0.7.1 h1:YZcsG11NqnK4czYLrWd9mpEuAJIHVQLwdrleYfszMAA=
-github.com/prometheus/tsdb v0.7.1/go.mod h1:qhTCs0VvXwvX/y3TZrWD7rabWM+ijKTux40TwIPHuXU=
 github.com/prometheus/tsdb v0.8.0 h1:w1tAGxsBMLkuGrFMhqgcCeBkM5d1YI24udArs+aASuQ=
 github.com/prometheus/tsdb v0.8.0/go.mod h1:fSI0j+IUQrDd7+ZtR9WKIGtoYAYAJUKcKhYLG25tN4g=
 github.com/rcrowley/go-metrics v0.0.0-20181016184325-3113b8401b8a h1:9ZKAASQSHhDYGoxY8uLVpewe1GDZ2vu2Tr/vTdVAkFQ=

vendor/github.com/json-iterator/go/README.md

@@ -10,10 +10,6 @@ A high-performance 100% compatible drop-in replacement of "encoding/json"
 
 You can also use thrift like JSON using [thrift-iterator](https://github.com/thrift-iterator/go)
 
-```
-Go开发者们请加入我们，滴滴出行平台技术部 taowen@didichuxing.com
-```
-
 # Benchmark
 
 ![benchmark](http://jsoniter.com/benchmarks/go-benchmark.png)

vendor/github.com/json-iterator/go/any.go

@@ -312,6 +312,10 @@ func (codec *directAnyCodec) Decode(ptr unsafe.Pointer, iter *Iterator) {
 
 func (codec *directAnyCodec) Encode(ptr unsafe.Pointer, stream *Stream) {
 	any := *(*Any)(ptr)
+	if any == nil {
+		stream.WriteNil()
+		return
+	}
 	any.WriteTo(stream)
 }
 

vendor/github.com/json-iterator/go/iter_float.go

@@ -77,14 +77,12 @@ func (iter *Iterator) ReadFloat32() (ret float32) {
 }
 
 func (iter *Iterator) readPositiveFloat32() (ret float32) {
-	value := uint64(0)
-	c := byte(' ')
 	i := iter.head
 	// first char
 	if i == iter.tail {
 		return iter.readFloat32SlowPath()
 	}
-	c = iter.buf[i]
+	c := iter.buf[i]
 	i++
 	ind := floatDigits[c]
 	switch ind {
@@ -107,7 +105,7 @@ func (iter *Iterator) readPositiveFloat32() (ret float32) {
 			return
 		}
 	}
-	value = uint64(ind)
+	value := uint64(ind)
 	// chars before dot
 non_decimal_loop:
 	for ; i < iter.tail; i++ {
@@ -145,9 +143,7 @@ non_decimal_loop:
 				}
 				// too many decimal places
 				return iter.readFloat32SlowPath()
-			case invalidCharForNumber:
+			case invalidCharForNumber, dotInNumber:
-				fallthrough
-			case dotInNumber:
 				return iter.readFloat32SlowPath()
 			}
 			decimalPlaces++
@@ -218,14 +214,12 @@ func (iter *Iterator) ReadFloat64() (ret float64) {
 }
 
 func (iter *Iterator) readPositiveFloat64() (ret float64) {
-	value := uint64(0)
-	c := byte(' ')
 	i := iter.head
 	// first char
 	if i == iter.tail {
 		return iter.readFloat64SlowPath()
 	}
-	c = iter.buf[i]
+	c := iter.buf[i]
 	i++
 	ind := floatDigits[c]
 	switch ind {
@@ -248,7 +242,7 @@ func (iter *Iterator) readPositiveFloat64() (ret float64) {
 			return
 		}
 	}
-	value = uint64(ind)
+	value := uint64(ind)
 	// chars before dot
 non_decimal_loop:
 	for ; i < iter.tail; i++ {
@@ -286,9 +280,7 @@ non_decimal_loop:
 				}
 				// too many decimal places
 				return iter.readFloat64SlowPath()
-			case invalidCharForNumber:
+			case invalidCharForNumber, dotInNumber:
-				fallthrough
-			case dotInNumber:
 				return iter.readFloat64SlowPath()
 			}
 			decimalPlaces++

vendor/github.com/json-iterator/go/iter_skip_strict.go

@@ -2,12 +2,22 @@
 
 package jsoniter
 
-import "fmt"
+import (
+	"fmt"
+	"io"
+)
 
 func (iter *Iterator) skipNumber() {
 	if !iter.trySkipNumber() {
 		iter.unreadByte()
-		iter.ReadFloat32()
+		if iter.Error != nil && iter.Error != io.EOF {
+			return
+		}
+		iter.ReadFloat64()
+		if iter.Error != nil && iter.Error != io.EOF {
+			iter.Error = nil
+			iter.ReadBigFloat()
+		}
 	}
 }
 

vendor/github.com/json-iterator/go/reflect_extension.go

@@ -338,7 +338,7 @@ func describeStruct(ctx *ctx, typ reflect2.Type) *StructDescriptor {
 	for i := 0; i < structType.NumField(); i++ {
 		field := structType.Field(i)
 		tag, hastag := field.Tag().Lookup(ctx.getTagKey())
-		if ctx.onlyTaggedField && !hastag {
+		if ctx.onlyTaggedField && !hastag && !field.Anonymous() {
 			continue
 		}
 		tagParts := strings.Split(tag, ",")

vendor/github.com/json-iterator/go/reflect_map.go

@@ -64,14 +64,26 @@ func decoderOfMapKey(ctx *ctx, typ reflect2.Type) ValDecoder {
 		return &numericMapKeyDecoder{decoderOfType(ctx, typ)}
 	default:
 		ptrType := reflect2.PtrTo(typ)
-		if ptrType.Implements(textMarshalerType) {
+		if ptrType.Implements(unmarshalerType) {
+			return &referenceDecoder{
+				&unmarshalerDecoder{
+					valType: ptrType,
+				},
+			}
+		}
+		if typ.Implements(unmarshalerType) {
+			return &unmarshalerDecoder{
+				valType: typ,
+			}
+		}
+		if ptrType.Implements(textUnmarshalerType) {
 			return &referenceDecoder{
 				&textUnmarshalerDecoder{
 					valType: ptrType,
 				},
 			}
 		}
-		if typ.Implements(textMarshalerType) {
+		if typ.Implements(textUnmarshalerType) {
 			return &textUnmarshalerDecoder{
 				valType: typ,
 			}

vendor/github.com/json-iterator/go/reflect_marshaler.go

@@ -93,8 +93,7 @@ func (encoder *marshalerEncoder) Encode(ptr unsafe.Pointer, stream *Stream) {
 		stream.WriteNil()
 		return
 	}
-	marshaler := obj.(json.Marshaler)
+	bytes, err := json.Marshal(obj)
-	bytes, err := marshaler.MarshalJSON()
 	if err != nil {
 		stream.Error = err
 	} else {

vendor/github.com/prometheus/client_golang/api/client.go

@@ -25,6 +25,8 @@ import (
 	"time"
 )
 
+type Warnings []string
+
 // DefaultRoundTripper is used if no RoundTripper is set in Config.
 var DefaultRoundTripper http.RoundTripper = &http.Transport{
 	Proxy: http.ProxyFromEnvironment,
@@ -55,27 +57,30 @@ func (cfg *Config) roundTripper() http.RoundTripper {
 // Client is the interface for an API client.
 type Client interface {
 	URL(ep string, args map[string]string) *url.URL
-	Do(context.Context, *http.Request) (*http.Response, []byte, error)
+	Do(context.Context, *http.Request) (*http.Response, []byte, Warnings, error)
 }
 
 // DoGetFallback will attempt to do the request as-is, and on a 405 it will fallback to a GET request.
-func DoGetFallback(c Client, ctx context.Context, u *url.URL, args url.Values) (*http.Response, []byte, error) {
+func DoGetFallback(c Client, ctx context.Context, u *url.URL, args url.Values) (*http.Response, []byte, Warnings, error) {
 	req, err := http.NewRequest(http.MethodPost, u.String(), strings.NewReader(args.Encode()))
 	if err != nil {
-		return nil, nil, err
+		return nil, nil, nil, err
 	}
 	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
 
-	resp, body, err := c.Do(ctx, req)
+	resp, body, warnings, err := c.Do(ctx, req)
 	if resp != nil && resp.StatusCode == http.StatusMethodNotAllowed {
 		u.RawQuery = args.Encode()
 		req, err = http.NewRequest(http.MethodGet, u.String(), nil)
 		if err != nil {
-			return nil, nil, err
+			return nil, nil, warnings, err
 		}
 
 	} else {
-		return resp, body, err
+		if err != nil {
+			return resp, body, warnings, err
+		}
+		return resp, body, warnings, nil
 	}
 	return c.Do(ctx, req)
 }
@@ -115,7 +120,7 @@ func (c *httpClient) URL(ep string, args map[string]string) *url.URL {
 	return &u
 }
 
-func (c *httpClient) Do(ctx context.Context, req *http.Request) (*http.Response, []byte, error) {
+func (c *httpClient) Do(ctx context.Context, req *http.Request) (*http.Response, []byte, Warnings, error) {
 	if ctx != nil {
 		req = req.WithContext(ctx)
 	}
@@ -127,7 +132,7 @@ func (c *httpClient) Do(ctx context.Context, req *http.Request) (*http.Response,
 	}()
 
 	if err != nil {
-		return nil, nil, err
+		return nil, nil, nil, err
 	}
 
 	var body []byte
@@ -147,5 +152,5 @@ func (c *httpClient) Do(ctx context.Context, req *http.Request) (*http.Response,
 	case <-done:
 	}
 
-	return resp, body, err
+	return resp, body, nil, err
 }

vendor/github.com/prometheus/client_golang/api/prometheus/v1/api.go

@@ -17,17 +17,104 @@ package v1
 
 import (
 	"context"
-	"encoding/json"
 	"errors"
 	"fmt"
+	"math"
 	"net/http"
 	"strconv"
 	"time"
+	"unsafe"
+
+	json "github.com/json-iterator/go"
+
+	"github.com/prometheus/common/model"
 
 	"github.com/prometheus/client_golang/api"
-	"github.com/prometheus/common/model"
 )
 
+func init() {
+	json.RegisterTypeEncoderFunc("model.SamplePair", marshalPointJSON, marshalPointJSONIsEmpty)
+	json.RegisterTypeDecoderFunc("model.SamplePair", unMarshalPointJSON)
+}
+
+func unMarshalPointJSON(ptr unsafe.Pointer, iter *json.Iterator) {
+	p := (*model.SamplePair)(ptr)
+	if !iter.ReadArray() {
+		iter.ReportError("unmarshal model.SamplePair", "SamplePair must be [timestamp, value]")
+		return
+	}
+	t := iter.ReadNumber()
+	if err := p.Timestamp.UnmarshalJSON([]byte(t)); err != nil {
+		iter.ReportError("unmarshal model.SamplePair", err.Error())
+		return
+	}
+	if !iter.ReadArray() {
+		iter.ReportError("unmarshal model.SamplePair", "SamplePair missing value")
+		return
+	}
+
+	f, err := strconv.ParseFloat(iter.ReadString(), 64)
+	if err != nil {
+		iter.ReportError("unmarshal model.SamplePair", err.Error())
+		return
+	}
+	p.Value = model.SampleValue(f)
+
+	if iter.ReadArray() {
+		iter.ReportError("unmarshal model.SamplePair", "SamplePair has too many values, must be [timestamp, value]")
+		return
+	}
+}
+
+func marshalPointJSON(ptr unsafe.Pointer, stream *json.Stream) {
+	p := *((*model.SamplePair)(ptr))
+	stream.WriteArrayStart()
+	// Write out the timestamp as a float divided by 1000.
+	// This is ~3x faster than converting to a float.
+	t := int64(p.Timestamp)
+	if t < 0 {
+		stream.WriteRaw(`-`)
+		t = -t
+	}
+	stream.WriteInt64(t / 1000)
+	fraction := t % 1000
+	if fraction != 0 {
+		stream.WriteRaw(`.`)
+		if fraction < 100 {
+			stream.WriteRaw(`0`)
+		}
+		if fraction < 10 {
+			stream.WriteRaw(`0`)
+		}
+		stream.WriteInt64(fraction)
+	}
+	stream.WriteMore()
+	stream.WriteRaw(`"`)
+
+	// Taken from https://github.com/json-iterator/go/blob/master/stream_float.go#L71 as a workaround
+	// to https://github.com/json-iterator/go/issues/365 (jsoniter, to follow json standard, doesn't allow inf/nan)
+	buf := stream.Buffer()
+	abs := math.Abs(float64(p.Value))
+	fmt := byte('f')
+	// Note: Must use float32 comparisons for underlying float32 value to get precise cutoffs right.
+	if abs != 0 {
+		if abs < 1e-6 || abs >= 1e21 {
+			fmt = 'e'
+			fmt = 'e'
+		}
+	}
+	buf = strconv.AppendFloat(buf, float64(p.Value), fmt, -1, 64)
+	stream.SetBuffer(buf)
+
+	stream.WriteRaw(`"`)
+	stream.WriteArrayEnd()
+
+}
+
+func marshalPointJSONIsEmpty(ptr unsafe.Pointer) bool {
+	return false
+}
+
 const (
 	statusAPIError = 422
 
@@ -37,9 +124,11 @@ const (
 	epAlertManagers   = apiPrefix + "/alertmanagers"
 	epQuery           = apiPrefix + "/query"
 	epQueryRange      = apiPrefix + "/query_range"
+	epLabels          = apiPrefix + "/labels"
 	epLabelValues     = apiPrefix + "/label/:name/values"
 	epSeries          = apiPrefix + "/series"
 	epTargets         = apiPrefix + "/targets"
+	epTargetsMetadata = apiPrefix + "/targets/metadata"
 	epRules           = apiPrefix + "/rules"
 	epSnapshot        = apiPrefix + "/admin/tsdb/snapshot"
 	epDeleteSeries    = apiPrefix + "/admin/tsdb/delete_series"
@@ -63,6 +152,9 @@ type RuleType string
 // RuleHealth models the health status of a rule.
 type RuleHealth string
 
+// MetricType models the type of a metric.
+type MetricType string
+
 const (
 	// Possible values for AlertState.
 	AlertStateFiring   AlertState = "firing"
@@ -91,6 +183,16 @@ const (
 	RuleHealthGood    = "ok"
 	RuleHealthUnknown = "unknown"
 	RuleHealthBad     = "err"
+
+	// Possible values for MetricType
+	MetricTypeCounter        MetricType = "counter"
+	MetricTypeGauge          MetricType = "gauge"
+	MetricTypeHistogram      MetricType = "histogram"
+	MetricTypeGaugeHistogram MetricType = "gaugehistogram"
+	MetricTypeSummary        MetricType = "summary"
+	MetricTypeInfo           MetricType = "info"
+	MetricTypeStateset       MetricType = "stateset"
+	MetricTypeUnknown        MetricType = "unknown"
 )
 
 // Error is an error returned by the API.
@@ -126,14 +228,16 @@ type API interface {
 	DeleteSeries(ctx context.Context, matches []string, startTime time.Time, endTime time.Time) error
 	// Flags returns the flag values that Prometheus was launched with.
 	Flags(ctx context.Context) (FlagsResult, error)
+	// LabelNames returns all the unique label names present in the block in sorted order.
+	LabelNames(ctx context.Context) ([]string, error)
 	// LabelValues performs a query for the values of the given label.
 	LabelValues(ctx context.Context, label string) (model.LabelValues, error)
 	// Query performs a query for the given time.
-	Query(ctx context.Context, query string, ts time.Time) (model.Value, error)
+	Query(ctx context.Context, query string, ts time.Time) (model.Value, api.Warnings, error)
 	// QueryRange performs a query for the given range.
-	QueryRange(ctx context.Context, query string, r Range) (model.Value, error)
+	QueryRange(ctx context.Context, query string, r Range) (model.Value, api.Warnings, error)
 	// Series finds series by label matchers.
-	Series(ctx context.Context, matches []string, startTime time.Time, endTime time.Time) ([]model.LabelSet, error)
+	Series(ctx context.Context, matches []string, startTime time.Time, endTime time.Time) ([]model.LabelSet, api.Warnings, error)
 	// Snapshot creates a snapshot of all current data into snapshots/<datetime>-<rand>
 	// under the TSDB's data directory and returns the directory as response.
 	Snapshot(ctx context.Context, skipHead bool) (SnapshotResult, error)
@@ -141,6 +245,8 @@ type API interface {
 	Rules(ctx context.Context) (RulesResult, error)
 	// Targets returns an overview of the current state of the Prometheus target discovery.
 	Targets(ctx context.Context) (TargetsResult, error)
+	// TargetsMetadata returns metadata about metrics currently scraped by the target.
+	TargetsMetadata(ctx context.Context, matchTarget string, metric string, limit string) ([]MetricMetadata, error)
 }
 
 // AlertsResult contains the result from querying the alerts endpoint.
@@ -226,7 +332,7 @@ type Alert struct {
 	Annotations model.LabelSet
 	Labels      model.LabelSet
 	State       AlertState
-	Value       float64
+	Value       string
 }
 
 // TargetsResult contains the result from querying the targets endpoint.
@@ -250,6 +356,15 @@ type DroppedTarget struct {
 	DiscoveredLabels map[string]string `json:"discoveredLabels"`
 }
 
+// MetricMetadata models the metadata of a metric.
+type MetricMetadata struct {
+	Target map[string]string `json:"target"`
+	Metric string            `json:"metric,omitempty"`
+	Type   MetricType        `json:"type"`
+	Help   string            `json:"help"`
+	Unit   string            `json:"unit"`
+}
+
 // queryResult contains result data for a query.
 type queryResult struct {
 	Type   model.ValueType `json:"resultType"`
@@ -416,14 +531,13 @@ func (h *httpAPI) Alerts(ctx context.Context) (AlertsResult, error) {
 		return AlertsResult{}, err
 	}
 
-	_, body, err := h.client.Do(ctx, req)
+	_, body, _, err := h.client.Do(ctx, req)
 	if err != nil {
 		return AlertsResult{}, err
 	}
 
 	var res AlertsResult
-	err = json.Unmarshal(body, &res)
+	return res, json.Unmarshal(body, &res)
-	return res, err
 }
 
 func (h *httpAPI) AlertManagers(ctx context.Context) (AlertManagersResult, error) {
@@ -434,14 +548,13 @@ func (h *httpAPI) AlertManagers(ctx context.Context) (AlertManagersResult, error
 		return AlertManagersResult{}, err
 	}
 
-	_, body, err := h.client.Do(ctx, req)
+	_, body, _, err := h.client.Do(ctx, req)
 	if err != nil {
 		return AlertManagersResult{}, err
 	}
 
 	var res AlertManagersResult
-	err = json.Unmarshal(body, &res)
+	return res, json.Unmarshal(body, &res)
-	return res, err
 }
 
 func (h *httpAPI) CleanTombstones(ctx context.Context) error {
@@ -452,7 +565,7 @@ func (h *httpAPI) CleanTombstones(ctx context.Context) error {
 		return err
 	}
 
-	_, _, err = h.client.Do(ctx, req)
+	_, _, _, err = h.client.Do(ctx, req)
 	return err
 }
 
@@ -464,14 +577,13 @@ func (h *httpAPI) Config(ctx context.Context) (ConfigResult, error) {
 		return ConfigResult{}, err
 	}
 
-	_, body, err := h.client.Do(ctx, req)
+	_, body, _, err := h.client.Do(ctx, req)
 	if err != nil {
 		return ConfigResult{}, err
 	}
 
 	var res ConfigResult
-	err = json.Unmarshal(body, &res)
+	return res, json.Unmarshal(body, &res)
-	return res, err
 }
 
 func (h *httpAPI) DeleteSeries(ctx context.Context, matches []string, startTime time.Time, endTime time.Time) error {
@@ -492,7 +604,7 @@ func (h *httpAPI) DeleteSeries(ctx context.Context, matches []string, startTime
 		return err
 	}
 
-	_, _, err = h.client.Do(ctx, req)
+	_, _, _, err = h.client.Do(ctx, req)
 	return err
 }
 
@@ -504,14 +616,27 @@ func (h *httpAPI) Flags(ctx context.Context) (FlagsResult, error) {
 		return FlagsResult{}, err
 	}
 
-	_, body, err := h.client.Do(ctx, req)
+	_, body, _, err := h.client.Do(ctx, req)
 	if err != nil {
 		return FlagsResult{}, err
 	}
 
 	var res FlagsResult
-	err = json.Unmarshal(body, &res)
+	return res, json.Unmarshal(body, &res)
-	return res, err
+}
+
+func (h *httpAPI) LabelNames(ctx context.Context) ([]string, error) {
+	u := h.client.URL(epLabels, nil)
+	req, err := http.NewRequest(http.MethodGet, u.String(), nil)
+	if err != nil {
+		return nil, err
+	}
+	_, body, _, err := h.client.Do(ctx, req)
+	if err != nil {
+		return nil, err
+	}
+	var labelNames []string
+	return labelNames, json.Unmarshal(body, &labelNames)
 }
 
 func (h *httpAPI) LabelValues(ctx context.Context, label string) (model.LabelValues, error) {
@@ -520,16 +645,15 @@ func (h *httpAPI) LabelValues(ctx context.Context, label string) (model.LabelVal
 	if err != nil {
 		return nil, err
 	}
-	_, body, err := h.client.Do(ctx, req)
+	_, body, _, err := h.client.Do(ctx, req)
 	if err != nil {
 		return nil, err
 	}
 	var labelValues model.LabelValues
-	err = json.Unmarshal(body, &labelValues)
+	return labelValues, json.Unmarshal(body, &labelValues)
-	return labelValues, err
 }
 
-func (h *httpAPI) Query(ctx context.Context, query string, ts time.Time) (model.Value, error) {
+func (h *httpAPI) Query(ctx context.Context, query string, ts time.Time) (model.Value, api.Warnings, error) {
 	u := h.client.URL(epQuery, nil)
 	q := u.Query()
 
@@ -538,18 +662,16 @@ func (h *httpAPI) Query(ctx context.Context, query string, ts time.Time) (model.
 		q.Set("time", ts.Format(time.RFC3339Nano))
 	}
 
-	_, body, err := api.DoGetFallback(h.client, ctx, u, q)
+	_, body, warnings, err := api.DoGetFallback(h.client, ctx, u, q)
 	if err != nil {
-		return nil, err
+		return nil, warnings, err
 	}
 
 	var qres queryResult
-	err = json.Unmarshal(body, &qres)
+	return model.Value(qres.v), warnings, json.Unmarshal(body, &qres)
-
-	return model.Value(qres.v), err
 }
 
-func (h *httpAPI) QueryRange(ctx context.Context, query string, r Range) (model.Value, error) {
+func (h *httpAPI) QueryRange(ctx context.Context, query string, r Range) (model.Value, api.Warnings, error) {
 	u := h.client.URL(epQueryRange, nil)
 	q := u.Query()
 
@@ -564,18 +686,17 @@ func (h *httpAPI) QueryRange(ctx context.Context, query string, r Range) (model.
 	q.Set("end", end)
 	q.Set("step", step)
 
-	_, body, err := api.DoGetFallback(h.client, ctx, u, q)
+	_, body, warnings, err := api.DoGetFallback(h.client, ctx, u, q)
 	if err != nil {
-		return nil, err
+		return nil, warnings, err
 	}
 
 	var qres queryResult
-	err = json.Unmarshal(body, &qres)
 
-	return model.Value(qres.v), err
+	return model.Value(qres.v), warnings, json.Unmarshal(body, &qres)
 }
 
-func (h *httpAPI) Series(ctx context.Context, matches []string, startTime time.Time, endTime time.Time) ([]model.LabelSet, error) {
+func (h *httpAPI) Series(ctx context.Context, matches []string, startTime time.Time, endTime time.Time) ([]model.LabelSet, api.Warnings, error) {
 	u := h.client.URL(epSeries, nil)
 	q := u.Query()
 
@@ -590,17 +711,16 @@ func (h *httpAPI) Series(ctx context.Context, matches []string, startTime time.T
 
 	req, err := http.NewRequest(http.MethodGet, u.String(), nil)
 	if err != nil {
-		return nil, err
+		return nil, nil, err
 	}
 
-	_, body, err := h.client.Do(ctx, req)
+	_, body, warnings, err := h.client.Do(ctx, req)
 	if err != nil {
-		return nil, err
+		return nil, warnings, err
 	}
 
 	var mset []model.LabelSet
-	err = json.Unmarshal(body, &mset)
+	return mset, warnings, json.Unmarshal(body, &mset)
-	return mset, err
 }
 
 func (h *httpAPI) Snapshot(ctx context.Context, skipHead bool) (SnapshotResult, error) {
@@ -616,14 +736,13 @@ func (h *httpAPI) Snapshot(ctx context.Context, skipHead bool) (SnapshotResult,
 		return SnapshotResult{}, err
 	}
 
-	_, body, err := h.client.Do(ctx, req)
+	_, body, _, err := h.client.Do(ctx, req)
 	if err != nil {
 		return SnapshotResult{}, err
 	}
 
 	var res SnapshotResult
-	err = json.Unmarshal(body, &res)
+	return res, json.Unmarshal(body, &res)
-	return res, err
 }
 
 func (h *httpAPI) Rules(ctx context.Context) (RulesResult, error) {
@@ -634,14 +753,13 @@ func (h *httpAPI) Rules(ctx context.Context) (RulesResult, error) {
 		return RulesResult{}, err
 	}
 
-	_, body, err := h.client.Do(ctx, req)
+	_, body, _, err := h.client.Do(ctx, req)
 	if err != nil {
 		return RulesResult{}, err
 	}
 
 	var res RulesResult
-	err = json.Unmarshal(body, &res)
+	return res, json.Unmarshal(body, &res)
-	return res, err
 }
 
 func (h *httpAPI) Targets(ctx context.Context) (TargetsResult, error) {
@@ -652,14 +770,37 @@ func (h *httpAPI) Targets(ctx context.Context) (TargetsResult, error) {
 		return TargetsResult{}, err
 	}
 
-	_, body, err := h.client.Do(ctx, req)
+	_, body, _, err := h.client.Do(ctx, req)
 	if err != nil {
 		return TargetsResult{}, err
 	}
 
 	var res TargetsResult
-	err = json.Unmarshal(body, &res)
+	return res, json.Unmarshal(body, &res)
-	return res, err
+}
+
+func (h *httpAPI) TargetsMetadata(ctx context.Context, matchTarget string, metric string, limit string) ([]MetricMetadata, error) {
+	u := h.client.URL(epTargetsMetadata, nil)
+	q := u.Query()
+
+	q.Set("match_target", matchTarget)
+	q.Set("metric", metric)
+	q.Set("limit", limit)
+
+	u.RawQuery = q.Encode()
+
+	req, err := http.NewRequest(http.MethodGet, u.String(), nil)
+	if err != nil {
+		return nil, err
+	}
+
+	_, body, _, err := h.client.Do(ctx, req)
+	if err != nil {
+		return nil, err
+	}
+
+	var res []MetricMetadata
+	return res, json.Unmarshal(body, &res)
 }
 
 // apiClient wraps a regular client and processes successful API responses.
@@ -673,6 +814,7 @@ type apiResponse struct {
 	Data      json.RawMessage `json:"data"`
 	ErrorType ErrorType       `json:"errorType"`
 	Error     string          `json:"error"`
+	Warnings  []string        `json:"warnings,omitempty"`
 }
 
 func apiError(code int) bool {
@@ -690,17 +832,17 @@ func errorTypeAndMsgFor(resp *http.Response) (ErrorType, string) {
 	return ErrBadResponse, fmt.Sprintf("bad response code %d", resp.StatusCode)
 }
 
-func (c apiClient) Do(ctx context.Context, req *http.Request) (*http.Response, []byte, error) {
+func (c apiClient) Do(ctx context.Context, req *http.Request) (*http.Response, []byte, api.Warnings, error) {
-	resp, body, err := c.Client.Do(ctx, req)
+	resp, body, warnings, err := c.Client.Do(ctx, req)
 	if err != nil {
-		return resp, body, err
+		return resp, body, warnings, err
 	}
 
 	code := resp.StatusCode
 
 	if code/100 != 2 && !apiError(code) {
 		errorType, errorMsg := errorTypeAndMsgFor(resp)
-		return resp, body, &Error{
+		return resp, body, warnings, &Error{
 			Type:   errorType,
 			Msg:    errorMsg,
 			Detail: string(body),
@@ -710,10 +852,10 @@ func (c apiClient) Do(ctx context.Context, req *http.Request) (*http.Response, [
 	var result apiResponse
 
 	if http.StatusNoContent != code {
-		if err = json.Unmarshal(body, &result); err != nil {
+		if jsonErr := json.Unmarshal(body, &result); jsonErr != nil {
-			return resp, body, &Error{
+			return resp, body, warnings, &Error{
 				Type: ErrBadResponse,
-				Msg:  err.Error(),
+				Msg:  jsonErr.Error(),
 			}
 		}
 	}
@@ -732,5 +874,6 @@ func (c apiClient) Do(ctx context.Context, req *http.Request) (*http.Response, [
 		}
 	}
 
-	return resp, []byte(result.Data), err
+	return resp, []byte(result.Data), warnings, err
+
 }

vendor/github.com/prometheus/client_golang/prometheus/build_info.go

@@ -0,0 +1,29 @@
+// Copyright 2019 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build go1.12
+
+package prometheus
+
+import "runtime/debug"
+
+// readBuildInfo is a wrapper around debug.ReadBuildInfo for Go 1.12+.
+func readBuildInfo() (path, version, sum string) {
+	path, version, sum = "unknown", "unknown", "unknown"
+	if bi, ok := debug.ReadBuildInfo(); ok {
+		path = bi.Main.Path
+		version = bi.Main.Version
+		sum = bi.Main.Sum
+	}
+	return
+}

vendor/github.com/prometheus/client_golang/prometheus/build_info_pre_1.12.go

@@ -0,0 +1,22 @@
+// Copyright 2019 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build !go1.12
+
+package prometheus
+
+// readBuildInfo is a wrapper around debug.ReadBuildInfo for Go versions before
+// 1.12. Remove this whole file once the minimum supported Go version is 1.12.
+func readBuildInfo() (path, version, sum string) {
+	return "unknown", "unknown", "unknown"
+}

vendor/github.com/prometheus/client_golang/prometheus/doc.go

@@ -183,7 +183,6 @@
 // method can then expose the gathered metrics in some way. Usually, the metrics
 // are served via HTTP on the /metrics endpoint. That's happening in the example
 // above. The tools to expose metrics via HTTP are in the promhttp sub-package.
-// (The top-level functions in the prometheus package are deprecated.)
 //
 // Pushing to the Pushgateway
 //

vendor/github.com/prometheus/client_golang/prometheus/go_collector.go

@@ -36,7 +36,7 @@ type goCollector struct {
 	msMaxAge        time.Duration           // Maximum allowed age of old memstats.
 }
 
-// NewGoCollector returns a collector which exports metrics about the current Go
+// NewGoCollector returns a collector that exports metrics about the current Go
 // process. This includes memory stats. To collect those, runtime.ReadMemStats
 // is called. This requires to “stop the world”, which usually only happens for
 // garbage collection (GC). Take the following implications into account when
@@ -364,3 +364,33 @@ type memStatsMetrics []struct {
 	eval    func(*runtime.MemStats) float64
 	valType ValueType
 }
+
+// NewBuildInfoCollector returns a collector collecting a single metric
+// "go_build_info" with the constant value 1 and three labels "path", "version",
+// and "checksum". Their label values contain the main module path, version, and
+// checksum, respectively. The labels will only have meaningful values if the
+// binary is built with Go module support and from source code retrieved from
+// the source repository (rather than the local file system). This is usually
+// accomplished by building from outside of GOPATH, specifying the full address
+// of the main package, e.g. "GO111MODULE=on go run
+// github.com/prometheus/client_golang/examples/random". If built without Go
+// module support, all label values will be "unknown". If built with Go module
+// support but using the source code from the local file system, the "path" will
+// be set appropriately, but "checksum" will be empty and "version" will be
+// "(devel)".
+//
+// This collector uses only the build information for the main module. See
+// https://github.com/povilasv/prommod for an example of a collector for the
+// module dependencies.
+func NewBuildInfoCollector() Collector {
+	path, version, sum := readBuildInfo()
+	c := &selfCollector{MustNewConstMetric(
+		NewDesc(
+			"go_build_info",
+			"Build information about the main Go module.",
+			nil, Labels{"path": path, "version": version, "checksum": sum},
+		),
+		GaugeValue, 1)}
+	c.init(c.self)
+	return c
+}

vendor/github.com/prometheus/client_golang/prometheus/http.go

@@ -1,505 +0,0 @@
-// Copyright 2014 The Prometheus Authors
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package prometheus
-
-import (
-	"bufio"
-	"compress/gzip"
-	"io"
-	"net"
-	"net/http"
-	"strconv"
-	"strings"
-	"sync"
-	"time"
-
-	"github.com/prometheus/common/expfmt"
-)
-
-// TODO(beorn7): Remove this whole file. It is a partial mirror of
-// promhttp/http.go (to avoid circular import chains) where everything HTTP
-// related should live. The functions here are just for avoiding
-// breakage. Everything is deprecated.
-
-const (
-	contentTypeHeader     = "Content-Type"
-	contentEncodingHeader = "Content-Encoding"
-	acceptEncodingHeader  = "Accept-Encoding"
-)
-
-var gzipPool = sync.Pool{
-	New: func() interface{} {
-		return gzip.NewWriter(nil)
-	},
-}
-
-// Handler returns an HTTP handler for the DefaultGatherer. It is
-// already instrumented with InstrumentHandler (using "prometheus" as handler
-// name).
-//
-// Deprecated: Please note the issues described in the doc comment of
-// InstrumentHandler. You might want to consider using promhttp.Handler instead.
-func Handler() http.Handler {
-	return InstrumentHandler("prometheus", UninstrumentedHandler())
-}
-
-// UninstrumentedHandler returns an HTTP handler for the DefaultGatherer.
-//
-// Deprecated: Use promhttp.HandlerFor(DefaultGatherer, promhttp.HandlerOpts{})
-// instead. See there for further documentation.
-func UninstrumentedHandler() http.Handler {
-	return http.HandlerFunc(func(rsp http.ResponseWriter, req *http.Request) {
-		mfs, err := DefaultGatherer.Gather()
-		if err != nil {
-			httpError(rsp, err)
-			return
-		}
-
-		contentType := expfmt.Negotiate(req.Header)
-		header := rsp.Header()
-		header.Set(contentTypeHeader, string(contentType))
-
-		w := io.Writer(rsp)
-		if gzipAccepted(req.Header) {
-			header.Set(contentEncodingHeader, "gzip")
-			gz := gzipPool.Get().(*gzip.Writer)
-			defer gzipPool.Put(gz)
-
-			gz.Reset(w)
-			defer gz.Close()
-
-			w = gz
-		}
-
-		enc := expfmt.NewEncoder(w, contentType)
-
-		for _, mf := range mfs {
-			if err := enc.Encode(mf); err != nil {
-				httpError(rsp, err)
-				return
-			}
-		}
-	})
-}
-
-var instLabels = []string{"method", "code"}
-
-type nower interface {
-	Now() time.Time
-}
-
-type nowFunc func() time.Time
-
-func (n nowFunc) Now() time.Time {
-	return n()
-}
-
-var now nower = nowFunc(func() time.Time {
-	return time.Now()
-})
-
-// InstrumentHandler wraps the given HTTP handler for instrumentation. It
-// registers four metric collectors (if not already done) and reports HTTP
-// metrics to the (newly or already) registered collectors: http_requests_total
-// (CounterVec), http_request_duration_microseconds (Summary),
-// http_request_size_bytes (Summary), http_response_size_bytes (Summary). Each
-// has a constant label named "handler" with the provided handlerName as
-// value. http_requests_total is a metric vector partitioned by HTTP method
-// (label name "method") and HTTP status code (label name "code").
-//
-// Deprecated: InstrumentHandler has several issues. Use the tooling provided in
-// package promhttp instead. The issues are the following: (1) It uses Summaries
-// rather than Histograms. Summaries are not useful if aggregation across
-// multiple instances is required. (2) It uses microseconds as unit, which is
-// deprecated and should be replaced by seconds. (3) The size of the request is
-// calculated in a separate goroutine. Since this calculator requires access to
-// the request header, it creates a race with any writes to the header performed
-// during request handling.  httputil.ReverseProxy is a prominent example for a
-// handler performing such writes. (4) It has additional issues with HTTP/2, cf.
-// https://github.com/prometheus/client_golang/issues/272.
-func InstrumentHandler(handlerName string, handler http.Handler) http.HandlerFunc {
-	return InstrumentHandlerFunc(handlerName, handler.ServeHTTP)
-}
-
-// InstrumentHandlerFunc wraps the given function for instrumentation. It
-// otherwise works in the same way as InstrumentHandler (and shares the same
-// issues).
-//
-// Deprecated: InstrumentHandlerFunc is deprecated for the same reasons as
-// InstrumentHandler is. Use the tooling provided in package promhttp instead.
-func InstrumentHandlerFunc(handlerName string, handlerFunc func(http.ResponseWriter, *http.Request)) http.HandlerFunc {
-	return InstrumentHandlerFuncWithOpts(
-		SummaryOpts{
-			Subsystem:   "http",
-			ConstLabels: Labels{"handler": handlerName},
-			Objectives:  map[float64]float64{0.5: 0.05, 0.9: 0.01, 0.99: 0.001},
-		},
-		handlerFunc,
-	)
-}
-
-// InstrumentHandlerWithOpts works like InstrumentHandler (and shares the same
-// issues) but provides more flexibility (at the cost of a more complex call
-// syntax). As InstrumentHandler, this function registers four metric
-// collectors, but it uses the provided SummaryOpts to create them. However, the
-// fields "Name" and "Help" in the SummaryOpts are ignored. "Name" is replaced
-// by "requests_total", "request_duration_microseconds", "request_size_bytes",
-// and "response_size_bytes", respectively. "Help" is replaced by an appropriate
-// help string. The names of the variable labels of the http_requests_total
-// CounterVec are "method" (get, post, etc.), and "code" (HTTP status code).
-//
-// If InstrumentHandlerWithOpts is called as follows, it mimics exactly the
-// behavior of InstrumentHandler:
-//
-//     prometheus.InstrumentHandlerWithOpts(
-//         prometheus.SummaryOpts{
-//              Subsystem:   "http",
-//              ConstLabels: prometheus.Labels{"handler": handlerName},
-//         },
-//         handler,
-//     )
-//
-// Technical detail: "requests_total" is a CounterVec, not a SummaryVec, so it
-// cannot use SummaryOpts. Instead, a CounterOpts struct is created internally,
-// and all its fields are set to the equally named fields in the provided
-// SummaryOpts.
-//
-// Deprecated: InstrumentHandlerWithOpts is deprecated for the same reasons as
-// InstrumentHandler is. Use the tooling provided in package promhttp instead.
-func InstrumentHandlerWithOpts(opts SummaryOpts, handler http.Handler) http.HandlerFunc {
-	return InstrumentHandlerFuncWithOpts(opts, handler.ServeHTTP)
-}
-
-// InstrumentHandlerFuncWithOpts works like InstrumentHandlerFunc (and shares
-// the same issues) but provides more flexibility (at the cost of a more complex
-// call syntax). See InstrumentHandlerWithOpts for details how the provided
-// SummaryOpts are used.
-//
-// Deprecated: InstrumentHandlerFuncWithOpts is deprecated for the same reasons
-// as InstrumentHandler is. Use the tooling provided in package promhttp instead.
-func InstrumentHandlerFuncWithOpts(opts SummaryOpts, handlerFunc func(http.ResponseWriter, *http.Request)) http.HandlerFunc {
-	reqCnt := NewCounterVec(
-		CounterOpts{
-			Namespace:   opts.Namespace,
-			Subsystem:   opts.Subsystem,
-			Name:        "requests_total",
-			Help:        "Total number of HTTP requests made.",
-			ConstLabels: opts.ConstLabels,
-		},
-		instLabels,
-	)
-	if err := Register(reqCnt); err != nil {
-		if are, ok := err.(AlreadyRegisteredError); ok {
-			reqCnt = are.ExistingCollector.(*CounterVec)
-		} else {
-			panic(err)
-		}
-	}
-
-	opts.Name = "request_duration_microseconds"
-	opts.Help = "The HTTP request latencies in microseconds."
-	reqDur := NewSummary(opts)
-	if err := Register(reqDur); err != nil {
-		if are, ok := err.(AlreadyRegisteredError); ok {
-			reqDur = are.ExistingCollector.(Summary)
-		} else {
-			panic(err)
-		}
-	}
-
-	opts.Name = "request_size_bytes"
-	opts.Help = "The HTTP request sizes in bytes."
-	reqSz := NewSummary(opts)
-	if err := Register(reqSz); err != nil {
-		if are, ok := err.(AlreadyRegisteredError); ok {
-			reqSz = are.ExistingCollector.(Summary)
-		} else {
-			panic(err)
-		}
-	}
-
-	opts.Name = "response_size_bytes"
-	opts.Help = "The HTTP response sizes in bytes."
-	resSz := NewSummary(opts)
-	if err := Register(resSz); err != nil {
-		if are, ok := err.(AlreadyRegisteredError); ok {
-			resSz = are.ExistingCollector.(Summary)
-		} else {
-			panic(err)
-		}
-	}
-
-	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		now := time.Now()
-
-		delegate := &responseWriterDelegator{ResponseWriter: w}
-		out := computeApproximateRequestSize(r)
-
-		_, cn := w.(http.CloseNotifier)
-		_, fl := w.(http.Flusher)
-		_, hj := w.(http.Hijacker)
-		_, rf := w.(io.ReaderFrom)
-		var rw http.ResponseWriter
-		if cn && fl && hj && rf {
-			rw = &fancyResponseWriterDelegator{delegate}
-		} else {
-			rw = delegate
-		}
-		handlerFunc(rw, r)
-
-		elapsed := float64(time.Since(now)) / float64(time.Microsecond)
-
-		method := sanitizeMethod(r.Method)
-		code := sanitizeCode(delegate.status)
-		reqCnt.WithLabelValues(method, code).Inc()
-		reqDur.Observe(elapsed)
-		resSz.Observe(float64(delegate.written))
-		reqSz.Observe(float64(<-out))
-	})
-}
-
-func computeApproximateRequestSize(r *http.Request) <-chan int {
-	// Get URL length in current goroutine for avoiding a race condition.
-	// HandlerFunc that runs in parallel may modify the URL.
-	s := 0
-	if r.URL != nil {
-		s += len(r.URL.String())
-	}
-
-	out := make(chan int, 1)
-
-	go func() {
-		s += len(r.Method)
-		s += len(r.Proto)
-		for name, values := range r.Header {
-			s += len(name)
-			for _, value := range values {
-				s += len(value)
-			}
-		}
-		s += len(r.Host)
-
-		// N.B. r.Form and r.MultipartForm are assumed to be included in r.URL.
-
-		if r.ContentLength != -1 {
-			s += int(r.ContentLength)
-		}
-		out <- s
-		close(out)
-	}()
-
-	return out
-}
-
-type responseWriterDelegator struct {
-	http.ResponseWriter
-
-	status      int
-	written     int64
-	wroteHeader bool
-}
-
-func (r *responseWriterDelegator) WriteHeader(code int) {
-	r.status = code
-	r.wroteHeader = true
-	r.ResponseWriter.WriteHeader(code)
-}
-
-func (r *responseWriterDelegator) Write(b []byte) (int, error) {
-	if !r.wroteHeader {
-		r.WriteHeader(http.StatusOK)
-	}
-	n, err := r.ResponseWriter.Write(b)
-	r.written += int64(n)
-	return n, err
-}
-
-type fancyResponseWriterDelegator struct {
-	*responseWriterDelegator
-}
-
-func (f *fancyResponseWriterDelegator) CloseNotify() <-chan bool {
-	//lint:ignore SA1019 http.CloseNotifier is deprecated but we don't want to
-	//remove support from client_golang yet.
-	return f.ResponseWriter.(http.CloseNotifier).CloseNotify()
-}
-
-func (f *fancyResponseWriterDelegator) Flush() {
-	f.ResponseWriter.(http.Flusher).Flush()
-}
-
-func (f *fancyResponseWriterDelegator) Hijack() (net.Conn, *bufio.ReadWriter, error) {
-	return f.ResponseWriter.(http.Hijacker).Hijack()
-}
-
-func (f *fancyResponseWriterDelegator) ReadFrom(r io.Reader) (int64, error) {
-	if !f.wroteHeader {
-		f.WriteHeader(http.StatusOK)
-	}
-	n, err := f.ResponseWriter.(io.ReaderFrom).ReadFrom(r)
-	f.written += n
-	return n, err
-}
-
-func sanitizeMethod(m string) string {
-	switch m {
-	case "GET", "get":
-		return "get"
-	case "PUT", "put":
-		return "put"
-	case "HEAD", "head":
-		return "head"
-	case "POST", "post":
-		return "post"
-	case "DELETE", "delete":
-		return "delete"
-	case "CONNECT", "connect":
-		return "connect"
-	case "OPTIONS", "options":
-		return "options"
-	case "NOTIFY", "notify":
-		return "notify"
-	default:
-		return strings.ToLower(m)
-	}
-}
-
-func sanitizeCode(s int) string {
-	switch s {
-	case 100:
-		return "100"
-	case 101:
-		return "101"
-
-	case 200:
-		return "200"
-	case 201:
-		return "201"
-	case 202:
-		return "202"
-	case 203:
-		return "203"
-	case 204:
-		return "204"
-	case 205:
-		return "205"
-	case 206:
-		return "206"
-
-	case 300:
-		return "300"
-	case 301:
-		return "301"
-	case 302:
-		return "302"
-	case 304:
-		return "304"
-	case 305:
-		return "305"
-	case 307:
-		return "307"
-
-	case 400:
-		return "400"
-	case 401:
-		return "401"
-	case 402:
-		return "402"
-	case 403:
-		return "403"
-	case 404:
-		return "404"
-	case 405:
-		return "405"
-	case 406:
-		return "406"
-	case 407:
-		return "407"
-	case 408:
-		return "408"
-	case 409:
-		return "409"
-	case 410:
-		return "410"
-	case 411:
-		return "411"
-	case 412:
-		return "412"
-	case 413:
-		return "413"
-	case 414:
-		return "414"
-	case 415:
-		return "415"
-	case 416:
-		return "416"
-	case 417:
-		return "417"
-	case 418:
-		return "418"
-
-	case 500:
-		return "500"
-	case 501:
-		return "501"
-	case 502:
-		return "502"
-	case 503:
-		return "503"
-	case 504:
-		return "504"
-	case 505:
-		return "505"
-
-	case 428:
-		return "428"
-	case 429:
-		return "429"
-	case 431:
-		return "431"
-	case 511:
-		return "511"
-
-	default:
-		return strconv.Itoa(s)
-	}
-}
-
-// gzipAccepted returns whether the client will accept gzip-encoded content.
-func gzipAccepted(header http.Header) bool {
-	a := header.Get(acceptEncodingHeader)
-	parts := strings.Split(a, ",")
-	for _, part := range parts {
-		part = strings.TrimSpace(part)
-		if part == "gzip" || strings.HasPrefix(part, "gzip;") {
-			return true
-		}
-	}
-	return false
-}
-
-// httpError removes any content-encoding header and then calls http.Error with
-// the provided error and http.StatusInternalServerErrer. Error contents is
-// supposed to be uncompressed plain text. However, same as with a plain
-// http.Error, any header settings will be void if the header has already been
-// sent. The error message will still be written to the writer, but it will
-// probably be of limited use.
-func httpError(rsp http.ResponseWriter, err error) {
-	rsp.Header().Del(contentEncodingHeader)
-	http.Error(
-		rsp,
-		"An error has occurred while serving metrics:\n\n"+err.Error(),
-		http.StatusInternalServerError,
-	)
-}

vendor/github.com/prometheus/client_golang/prometheus/process_collector.go

@@ -16,8 +16,6 @@ package prometheus
 import (
 	"errors"
 	"os"
-
-	"github.com/prometheus/procfs"
 )
 
 type processCollector struct {
@@ -59,20 +57,9 @@ type ProcessCollectorOpts struct {
 // collector for the current process with an empty namespace string and no error
 // reporting.
 //
-// Currently, the collector depends on a Linux-style proc filesystem and
+// The collector only works on operating systems with a Linux-style proc
-// therefore only exports metrics for Linux.
+// filesystem and on Microsoft Windows. On other operating systems, it will not
-//
+// collect any metrics.
-// Note: An older version of this function had the following signature:
-//
-//     NewProcessCollector(pid int, namespace string) Collector
-//
-// Most commonly, it was called as
-//
-//     NewProcessCollector(os.Getpid(), "")
-//
-// The following call of the current version is equivalent to the above:
-//
-//     NewProcessCollector(ProcessCollectorOpts{})
 func NewProcessCollector(opts ProcessCollectorOpts) Collector {
 	ns := ""
 	if len(opts.Namespace) > 0 {
@@ -126,7 +113,7 @@ func NewProcessCollector(opts ProcessCollectorOpts) Collector {
 	}
 
 	// Set up process metric collection if supported by the runtime.
-	if _, err := procfs.NewStat(); err == nil {
+	if canCollectProcess() {
 		c.collectFn = c.processCollect
 	} else {
 		c.collectFn = func(ch chan<- Metric) {
@@ -153,46 +140,6 @@ func (c *processCollector) Collect(ch chan<- Metric) {
 	c.collectFn(ch)
 }
 
-func (c *processCollector) processCollect(ch chan<- Metric) {
-	pid, err := c.pidFn()
-	if err != nil {
-		c.reportError(ch, nil, err)
-		return
-	}
-
-	p, err := procfs.NewProc(pid)
-	if err != nil {
-		c.reportError(ch, nil, err)
-		return
-	}
-
-	if stat, err := p.NewStat(); err == nil {
-		ch <- MustNewConstMetric(c.cpuTotal, CounterValue, stat.CPUTime())
-		ch <- MustNewConstMetric(c.vsize, GaugeValue, float64(stat.VirtualMemory()))
-		ch <- MustNewConstMetric(c.rss, GaugeValue, float64(stat.ResidentMemory()))
-		if startTime, err := stat.StartTime(); err == nil {
-			ch <- MustNewConstMetric(c.startTime, GaugeValue, startTime)
-		} else {
-			c.reportError(ch, c.startTime, err)
-		}
-	} else {
-		c.reportError(ch, nil, err)
-	}
-
-	if fds, err := p.FileDescriptorsLen(); err == nil {
-		ch <- MustNewConstMetric(c.openFDs, GaugeValue, float64(fds))
-	} else {
-		c.reportError(ch, c.openFDs, err)
-	}
-
-	if limits, err := p.NewLimits(); err == nil {
-		ch <- MustNewConstMetric(c.maxFDs, GaugeValue, float64(limits.OpenFiles))
-		ch <- MustNewConstMetric(c.maxVsize, GaugeValue, float64(limits.AddressSpace))
-	} else {
-		c.reportError(ch, nil, err)
-	}
-}
-
 func (c *processCollector) reportError(ch chan<- Metric, desc *Desc, err error) {
 	if !c.reportErrors {
 		return

vendor/github.com/prometheus/client_golang/prometheus/process_collector_other.go

@@ -0,0 +1,65 @@
+// Copyright 2019 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build !windows
+
+package prometheus
+
+import (
+	"github.com/prometheus/procfs"
+)
+
+func canCollectProcess() bool {
+	_, err := procfs.NewDefaultFS()
+	return err == nil
+}
+
+func (c *processCollector) processCollect(ch chan<- Metric) {
+	pid, err := c.pidFn()
+	if err != nil {
+		c.reportError(ch, nil, err)
+		return
+	}
+
+	p, err := procfs.NewProc(pid)
+	if err != nil {
+		c.reportError(ch, nil, err)
+		return
+	}
+
+	if stat, err := p.Stat(); err == nil {
+		ch <- MustNewConstMetric(c.cpuTotal, CounterValue, stat.CPUTime())
+		ch <- MustNewConstMetric(c.vsize, GaugeValue, float64(stat.VirtualMemory()))
+		ch <- MustNewConstMetric(c.rss, GaugeValue, float64(stat.ResidentMemory()))
+		if startTime, err := stat.StartTime(); err == nil {
+			ch <- MustNewConstMetric(c.startTime, GaugeValue, startTime)
+		} else {
+			c.reportError(ch, c.startTime, err)
+		}
+	} else {
+		c.reportError(ch, nil, err)
+	}
+
+	if fds, err := p.FileDescriptorsLen(); err == nil {
+		ch <- MustNewConstMetric(c.openFDs, GaugeValue, float64(fds))
+	} else {
+		c.reportError(ch, c.openFDs, err)
+	}
+
+	if limits, err := p.Limits(); err == nil {
+		ch <- MustNewConstMetric(c.maxFDs, GaugeValue, float64(limits.OpenFiles))
+		ch <- MustNewConstMetric(c.maxVsize, GaugeValue, float64(limits.AddressSpace))
+	} else {
+		c.reportError(ch, nil, err)
+	}
+}

vendor/github.com/prometheus/client_golang/prometheus/process_collector_windows.go

@@ -0,0 +1,112 @@
+// Copyright 2019 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package prometheus
+
+import (
+	"syscall"
+	"unsafe"
+
+	"golang.org/x/sys/windows"
+)
+
+func canCollectProcess() bool {
+	return true
+}
+
+var (
+	modpsapi    = syscall.NewLazyDLL("psapi.dll")
+	modkernel32 = syscall.NewLazyDLL("kernel32.dll")
+
+	procGetProcessMemoryInfo  = modpsapi.NewProc("GetProcessMemoryInfo")
+	procGetProcessHandleCount = modkernel32.NewProc("GetProcessHandleCount")
+)
+
+type processMemoryCounters struct {
+	// https://docs.microsoft.com/en-us/windows/desktop/api/psapi/ns-psapi-_process_memory_counters_ex
+	_                          uint32
+	PageFaultCount             uint32
+	PeakWorkingSetSize         uint64
+	WorkingSetSize             uint64
+	QuotaPeakPagedPoolUsage    uint64
+	QuotaPagedPoolUsage        uint64
+	QuotaPeakNonPagedPoolUsage uint64
+	QuotaNonPagedPoolUsage     uint64
+	PagefileUsage              uint64
+	PeakPagefileUsage          uint64
+	PrivateUsage               uint64
+}
+
+func getProcessMemoryInfo(handle windows.Handle) (processMemoryCounters, error) {
+	mem := processMemoryCounters{}
+	r1, _, err := procGetProcessMemoryInfo.Call(
+		uintptr(handle),
+		uintptr(unsafe.Pointer(&mem)),
+		uintptr(unsafe.Sizeof(mem)),
+	)
+	if r1 != 1 {
+		return mem, err
+	} else {
+		return mem, nil
+	}
+}
+
+func getProcessHandleCount(handle windows.Handle) (uint32, error) {
+	var count uint32
+	r1, _, err := procGetProcessHandleCount.Call(
+		uintptr(handle),
+		uintptr(unsafe.Pointer(&count)),
+	)
+	if r1 != 1 {
+		return 0, err
+	} else {
+		return count, nil
+	}
+}
+
+func (c *processCollector) processCollect(ch chan<- Metric) {
+	h, err := windows.GetCurrentProcess()
+	if err != nil {
+		c.reportError(ch, nil, err)
+		return
+	}
+
+	var startTime, exitTime, kernelTime, userTime windows.Filetime
+	err = windows.GetProcessTimes(h, &startTime, &exitTime, &kernelTime, &userTime)
+	if err != nil {
+		c.reportError(ch, nil, err)
+		return
+	}
+	ch <- MustNewConstMetric(c.startTime, GaugeValue, float64(startTime.Nanoseconds()/1e9))
+	ch <- MustNewConstMetric(c.cpuTotal, CounterValue, fileTimeToSeconds(kernelTime)+fileTimeToSeconds(userTime))
+
+	mem, err := getProcessMemoryInfo(h)
+	if err != nil {
+		c.reportError(ch, nil, err)
+		return
+	}
+	ch <- MustNewConstMetric(c.vsize, GaugeValue, float64(mem.PrivateUsage))
+	ch <- MustNewConstMetric(c.rss, GaugeValue, float64(mem.WorkingSetSize))
+
+	handles, err := getProcessHandleCount(h)
+	if err != nil {
+		c.reportError(ch, nil, err)
+		return
+	}
+	ch <- MustNewConstMetric(c.openFDs, GaugeValue, float64(handles))
+	ch <- MustNewConstMetric(c.maxFDs, GaugeValue, float64(16*1024*1024)) // Windows has a hard-coded max limit, not per-process.
+}
+
+func fileTimeToSeconds(ft windows.Filetime) float64 {
+	return float64(uint64(ft.HighDateTime)<<32+uint64(ft.LowDateTime)) / 1e7
+}

vendor/github.com/prometheus/client_golang/prometheus/promhttp/http.go

@@ -84,10 +84,32 @@ func Handler() http.Handler {
 // instrumentation. Use the InstrumentMetricHandler function to apply the same
 // kind of instrumentation as it is used by the Handler function.
 func HandlerFor(reg prometheus.Gatherer, opts HandlerOpts) http.Handler {
-	var inFlightSem chan struct{}
+	var (
+		inFlightSem chan struct{}
+		errCnt      = prometheus.NewCounterVec(
+			prometheus.CounterOpts{
+				Name: "promhttp_metric_handler_errors_total",
+				Help: "Total number of internal errors encountered by the promhttp metric handler.",
+			},
+			[]string{"cause"},
+		)
+	)
+
 	if opts.MaxRequestsInFlight > 0 {
 		inFlightSem = make(chan struct{}, opts.MaxRequestsInFlight)
 	}
+	if opts.Registry != nil {
+		// Initialize all possibilites that can occur below.
+		errCnt.WithLabelValues("gathering")
+		errCnt.WithLabelValues("encoding")
+		if err := opts.Registry.Register(errCnt); err != nil {
+			if are, ok := err.(prometheus.AlreadyRegisteredError); ok {
+				errCnt = are.ExistingCollector.(*prometheus.CounterVec)
+			} else {
+				panic(err)
+			}
+		}
+	}
 
 	h := http.HandlerFunc(func(rsp http.ResponseWriter, req *http.Request) {
 		if inFlightSem != nil {
@@ -106,6 +128,7 @@ func HandlerFor(reg prometheus.Gatherer, opts HandlerOpts) http.Handler {
 			if opts.ErrorLog != nil {
 				opts.ErrorLog.Println("error gathering metrics:", err)
 			}
+			errCnt.WithLabelValues("gathering").Inc()
 			switch opts.ErrorHandling {
 			case PanicOnError:
 				panic(err)
@@ -146,6 +169,7 @@ func HandlerFor(reg prometheus.Gatherer, opts HandlerOpts) http.Handler {
 				if opts.ErrorLog != nil {
 					opts.ErrorLog.Println("error encoding and sending metric family:", err)
 				}
+				errCnt.WithLabelValues("encoding").Inc()
 				switch opts.ErrorHandling {
 				case PanicOnError:
 					panic(err)
@@ -236,9 +260,12 @@ const (
 	// Ignore errors and try to serve as many metrics as possible.  However,
 	// if no metrics can be served, serve an HTTP status code 500 and the
 	// last error message in the body. Only use this in deliberate "best
-	// effort" metrics collection scenarios. It is recommended to at least
+	// effort" metrics collection scenarios. In this case, it is highly
-	// log errors (by providing an ErrorLog in HandlerOpts) to not mask
+	// recommended to provide other means of detecting errors: By setting an
-	// errors completely.
+	// ErrorLog in HandlerOpts, the errors are logged. By providing a
+	// Registry in HandlerOpts, the exposed metrics include an error counter
+	// "promhttp_metric_handler_errors_total", which can be used for
+	// alerts.
 	ContinueOnError
 	// Panic upon the first error encountered (useful for "crash only" apps).
 	PanicOnError
@@ -261,6 +288,18 @@ type HandlerOpts struct {
 	// logged regardless of the configured ErrorHandling provided ErrorLog
 	// is not nil.
 	ErrorHandling HandlerErrorHandling
+	// If Registry is not nil, it is used to register a metric
+	// "promhttp_metric_handler_errors_total", partitioned by "cause". A
+	// failed registration causes a panic. Note that this error counter is
+	// different from the instrumentation you get from the various
+	// InstrumentHandler... helpers. It counts errors that don't necessarily
+	// result in a non-2xx HTTP status code. There are two typical cases:
+	// (1) Encoding errors that only happen after streaming of the HTTP body
+	// has already started (and the status code 200 has been sent). This
+	// should only happen with custom collectors. (2) Collection errors with
+	// no effect on the HTTP status code because ErrorHandling is set to
+	// ContinueOnError.
+	Registry prometheus.Registerer
 	// If DisableCompression is true, the handler will never compress the
 	// response, even if requested by the client.
 	DisableCompression bool

vendor/github.com/prometheus/client_golang/prometheus/registry.go

@@ -325,10 +325,18 @@ func (r *Registry) Register(c Collector) error {
 		return nil
 	}
 	if existing, exists := r.collectorsByID[collectorID]; exists {
+		switch e := existing.(type) {
+		case *wrappingCollector:
 			return AlreadyRegisteredError{
-			ExistingCollector: existing,
+				ExistingCollector: e.unwrapRecursively(),
 				NewCollector:      c,
 			}
+		default:
+			return AlreadyRegisteredError{
+				ExistingCollector: e,
+				NewCollector:      c,
+			}
+		}
 	}
 	// If the collectorID is new, but at least one of the descs existed
 	// before, we are in trouble.

vendor/github.com/prometheus/client_golang/prometheus/summary.go

@@ -39,7 +39,7 @@ const quantileLabel = "quantile"
 // A typical use-case is the observation of request latencies. By default, a
 // Summary provides the median, the 90th and the 99th percentile of the latency
 // as rank estimations. However, the default behavior will change in the
-// upcoming v0.10 of the library. There will be no rank estimations at all by
+// upcoming v1.0.0 of the library. There will be no rank estimations at all by
 // default. For a sane transition, it is recommended to set the desired rank
 // estimations explicitly.
 //
@@ -58,16 +58,8 @@ type Summary interface {
 	Observe(float64)
 }
 
-// DefObjectives are the default Summary quantile values.
+var errQuantileLabelNotAllowed = fmt.Errorf(
-//
-// Deprecated: DefObjectives will not be used as the default objectives in
-// v0.10 of the library. The default Summary will have no quantiles then.
-var (
-	DefObjectives = map[float64]float64{0.5: 0.05, 0.9: 0.01, 0.99: 0.001}
-
-	errQuantileLabelNotAllowed = fmt.Errorf(
 	"%q is not allowed as label name in summaries", quantileLabel,
-	)
 )
 
 // Default values for SummaryOpts.
@@ -86,7 +78,7 @@ const (
 // mandatory to set Name to a non-empty string. While all other fields are
 // optional and can safely be left at their zero value, it is recommended to set
 // a help string and to explicitly set the Objectives field to the desired value
-// as the default value will change in the upcoming v0.10 of the library.
+// as the default value will change in the upcoming v1.0.0 of the library.
 type SummaryOpts struct {
 	// Namespace, Subsystem, and Name are components of the fully-qualified
 	// name of the Summary (created by joining these components with
@@ -123,14 +115,8 @@ type SummaryOpts struct {
 	// Objectives defines the quantile rank estimates with their respective
 	// absolute error. If Objectives[q] = e, then the value reported for q
 	// will be the φ-quantile value for some φ between q-e and q+e.  The
-	// default value is DefObjectives. It is used if Objectives is left at
+	// default value is an empty map, resulting in a summary without
-	// its zero value (i.e. nil). To create a Summary without Objectives,
+	// quantiles.
-	// set it to an empty map (i.e. map[float64]float64{}).
-	//
-	// Note that the current value of DefObjectives is deprecated. It will
-	// be replaced by an empty map in v0.10 of the library. Please
-	// explicitly set Objectives to the desired value to avoid problems
-	// during the transition.
 	Objectives map[float64]float64
 
 	// MaxAge defines the duration for which an observation stays relevant
@@ -199,7 +185,7 @@ func newSummary(desc *Desc, opts SummaryOpts, labelValues ...string) Summary {
 	}
 
 	if opts.Objectives == nil {
-		opts.Objectives = DefObjectives
+		opts.Objectives = map[float64]float64{}
 	}
 
 	if opts.MaxAge < 0 {

vendor/github.com/prometheus/client_golang/prometheus/wrap.go

@@ -32,6 +32,12 @@ import (
 // WrapRegistererWith provides a way to add fixed labels to a subset of
 // Collectors. It should not be used to add fixed labels to all metrics exposed.
 //
+// Conflicts between Collectors registered through the original Registerer with
+// Collectors registered through the wrapping Registerer will still be
+// detected. Any AlreadyRegisteredError returned by the Register method of
+// either Registerer will contain the ExistingCollector in the form it was
+// provided to the respective registry.
+//
 // The Collector example demonstrates a use of WrapRegistererWith.
 func WrapRegistererWith(labels Labels, reg Registerer) Registerer {
 	return &wrappingRegisterer{
@@ -54,6 +60,12 @@ func WrapRegistererWith(labels Labels, reg Registerer) Registerer {
 // (see NewGoCollector) and the process collector (see NewProcessCollector). (In
 // fact, those metrics are already prefixed with “go_” or “process_”,
 // respectively.)
+//
+// Conflicts between Collectors registered through the original Registerer with
+// Collectors registered through the wrapping Registerer will still be
+// detected. Any AlreadyRegisteredError returned by the Register method of
+// either Registerer will contain the ExistingCollector in the form it was
+// provided to the respective registry.
 func WrapRegistererWithPrefix(prefix string, reg Registerer) Registerer {
 	return &wrappingRegisterer{
 		wrappedRegisterer: reg,
@@ -123,6 +135,15 @@ func (c *wrappingCollector) Describe(ch chan<- *Desc) {
 	}
 }
 
+func (c *wrappingCollector) unwrapRecursively() Collector {
+	switch wc := c.wrappedCollector.(type) {
+	case *wrappingCollector:
+		return wc.unwrapRecursively()
+	default:
+		return wc
+	}
+}
+
 type wrappingMetric struct {
 	wrappedMetric Metric
 	prefix        string

vendor/github.com/prometheus/common/model/time.go

@@ -150,7 +150,13 @@ func (t *Time) UnmarshalJSON(b []byte) error {
 			return err
 		}
 
+		// If the value was something like -0.1 the negative is lost in the
+		// parsing because of the leading zero, this ensures that we capture it.
+		if len(p[0]) > 0 && p[0][0] == '-' && v+va > 0 {
+			*t = Time(v+va) * -1
+		} else {
 			*t = Time(v + va)
+		}
 
 	default:
 		return fmt.Errorf("invalid time %q", string(b))

vendor/github.com/prometheus/procfs/Makefile

@@ -14,6 +14,7 @@
 include Makefile.common
 
 %/.unpacked: %.ttar
+	@echo ">> extracting fixtures"
 	./ttar -C $(dir $*) -x -f $*.ttar
 	touch $@
 

vendor/github.com/prometheus/procfs/Makefile.common

@@ -69,7 +69,7 @@ else
 	GO_BUILD_PLATFORM ?= $(GOHOSTOS)-$(GOHOSTARCH)
 endif
 
-PROMU_VERSION ?= 0.3.0
+PROMU_VERSION ?= 0.4.0
 PROMU_URL     := https://github.com/prometheus/promu/releases/download/v$(PROMU_VERSION)/promu-$(PROMU_VERSION).$(GO_BUILD_PLATFORM).tar.gz
 
 GOLANGCI_LINT :=

vendor/github.com/prometheus/procfs/README.md

@@ -1,7 +1,7 @@
 # procfs
 
 This procfs package provides functions to retrieve system, kernel and process
-metrics from the pseudo-filesystem proc.
+metrics from the pseudo-filesystems /proc and /sys.
 
 *WARNING*: This package is a work in progress. Its API may still break in
 backwards-incompatible ways without warnings. Use it at your own risk.
@@ -9,3 +9,45 @@ backwards-incompatible ways without warnings. Use it at your own risk.
 [![GoDoc](https://godoc.org/github.com/prometheus/procfs?status.png)](https://godoc.org/github.com/prometheus/procfs)
 [![Build Status](https://travis-ci.org/prometheus/procfs.svg?branch=master)](https://travis-ci.org/prometheus/procfs)
 [![Go Report Card](https://goreportcard.com/badge/github.com/prometheus/procfs)](https://goreportcard.com/report/github.com/prometheus/procfs)
+
+## Usage
+
+The procfs library is organized by packages based on whether the gathered data is coming from
+/proc, /sys, or both.  Each package contains an `FS` type which represents the path to either /proc, /sys, or both.  For example, current cpu statistics are gathered from
+`/proc/stat` and are available via the root procfs package.  First, the proc filesystem mount
+point is initialized, and then the stat information is read.
+
+```go
+fs, err := procfs.NewFS("/proc")
+stats, err := fs.Stat()
+```
+
+Some sub-packages such as `blockdevice`, require access to both the proc and sys filesystems.
+
+```go
+    fs, err := blockdevice.NewFS("/proc", "/sys")
+    stats, err := fs.ProcDiskstats()
+```
+
+## Building and Testing
+
+The procfs library is normally built as part of another application.  However, when making
+changes to the library, the `make test` command can be used to run the API test suite.
+
+### Updating Test Fixtures
+
+The procfs library includes a set of test fixtures which include many example files from
+the `/proc` and `/sys` filesystems.  These fixtures are included as a [ttar](https://github.com/ideaship/ttar) file
+which is extracted automatically during testing.  To add/update the test fixtures, first
+ensure the `fixtures` directory is up to date by removing the existing directory and then
+extracting the ttar file using `make fixtures/.unpacked` or just `make test`.
+
+```bash
+rm -rf fixtures
+make test
+```
+
+Next, make the required changes to the extracted files in the `fixtures` directory.  When
+the changes are complete, run `make update_fixtures` to create a new `fixtures.ttar` file
+based on the updated `fixtures` directory.  And finally, verify the changes using
+`git diff fixtures.ttar`.

vendor/github.com/prometheus/procfs/buddyinfo.go

@@ -31,18 +31,8 @@ type BuddyInfo struct {
 	Sizes []float64
 }
 
-// NewBuddyInfo reads the buddyinfo statistics.
-func NewBuddyInfo() ([]BuddyInfo, error) {
-	fs, err := NewFS(DefaultMountPoint)
-	if err != nil {
-		return nil, err
-	}
-
-	return fs.NewBuddyInfo()
-}
-
 // NewBuddyInfo reads the buddyinfo statistics from the specified `proc` filesystem.
-func (fs FS) NewBuddyInfo() ([]BuddyInfo, error) {
+func (fs FS) BuddyInfo() ([]BuddyInfo, error) {
 	file, err := os.Open(fs.proc.Path("buddyinfo"))
 	if err != nil {
 		return nil, err

vendor/github.com/prometheus/procfs/fixtures.ttar

@@ -75,13 +75,13 @@ Max realtime timeout      unlimited            unlimited            us
 Mode: 644
 # ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 Path: fixtures/proc/26231/mountstats
-Lines: 19
+Lines: 20
 device rootfs mounted on / with fstype rootfs
 device sysfs mounted on /sys with fstype sysfs
 device proc mounted on /proc with fstype proc
 device /dev/sda1 mounted on / with fstype ext4
 device 192.168.1.1:/srv/test mounted on /mnt/nfs/test with fstype nfs4 statvers=1.1
-	opts:	rw,vers=4.0,rsize=1048576,wsize=1048576,namlen=255,acregmin=3,acregmax=60,acdirmin=30,acdirmax=60,hard,proto=tcp,port=0,timeo=600,retrans=2,sec=sys,clientaddr=192.168.1.5,local_lock=none
+	opts:	rw,vers=4.0,rsize=1048576,wsize=1048576,namlen=255,acregmin=3,acregmax=60,acdirmin=30,acdirmax=60,hard,proto=tcp,port=0,timeo=600,retrans=2,sec=sys,mountaddr=192.168.1.1,clientaddr=192.168.1.5,local_lock=none
 	age:	13968
 	caps:	caps=0xfff7,wtmult=512,dtsize=32768,bsize=0,namlen=255
 	nfsv4:	bm0=0xfdffafff,bm1=0xf9be3e,bm2=0x0,acl=0x0,pnfs=not configured
@@ -94,6 +94,7 @@ device 192.168.1.1:/srv/test mounted on /mnt/nfs/test with fstype nfs4 statvers=
 	        NULL: 0 0 0 0 0 0 0 0
 	        READ: 1298 1298 0 207680 1210292152 6 79386 79407
 	       WRITE: 0 0 0 0 0 0 0 0
+	      ACCESS: 2927395007 2927394995 0 526931094212 362996810236 18446743919241604546 1667369447 1953587717
 
 Mode: 644
 # ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
@@ -125,6 +126,63 @@ Lines: 1
 26231 (vim) R 5392 7446 5392 34835 7446 4218880 32533 309516 26 82 1677 44 158 99 20 0 1 0 82375 56274944 1981 18446744073709551615 4194304 6294284 140736914091744 140736914087944 139965136429984 0 0 12288 1870679807 0 0 0 17 0 0 0 31 0 0 8391624 8481048 16420864 140736914093252 140736914093279 140736914093279 140736914096107 0
 Mode: 644
 # ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+Path: fixtures/proc/26231/status
+Lines: 53
+
+Name:	prometheus
+Umask:	0022
+State:	S (sleeping)
+Tgid:	1
+Ngid:	0
+Pid:	1
+PPid:	0
+TracerPid:	0
+Uid:	0	0	0	0
+Gid:	0	0	0	0
+FDSize:	128
+Groups:
+NStgid:	1
+NSpid:	1
+NSpgid:	1
+NSsid:	1
+VmPeak:	   58472 kB
+VmSize:	   58440 kB
+VmLck:	       0 kB
+VmPin:	       0 kB
+VmHWM:	    8028 kB
+VmRSS:	    6716 kB
+RssAnon:	    2092 kB
+RssFile:	    4624 kB
+RssShmem:	       0 kB
+VmData:	    2580 kB
+VmStk:	     136 kB
+VmExe:	     948 kB
+VmLib:	    6816 kB
+VmPTE:	     128 kB
+VmPMD:	      12 kB
+VmSwap:	     660 kB
+HugetlbPages:	       0 kB
+Threads:	1
+SigQ:	8/63965
+SigPnd:	0000000000000000
+ShdPnd:	0000000000000000
+SigBlk:	7be3c0fe28014a03
+SigIgn:	0000000000001000
+SigCgt:	00000001800004ec
+CapInh:	0000000000000000
+CapPrm:	0000003fffffffff
+CapEff:	0000003fffffffff
+CapBnd:	0000003fffffffff
+CapAmb:	0000000000000000
+Seccomp:	0
+Cpus_allowed:	ff
+Cpus_allowed_list:	0-7
+Mems_allowed:	00000000,00000001
+Mems_allowed_list:	0
+voluntary_ctxt_switches:	4742839
+nonvoluntary_ctxt_switches:	1727500
+Mode: 644
+# ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 Directory: fixtures/proc/26232
 Mode: 755
 # ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
@@ -402,6 +460,26 @@ proc4 2 2 10853
 proc4ops 72 0 0 0 1098 2 0 0 0 0 8179 5896 0 0 0 0 5900 0 0 2 0 2 0 9609 0 2 150 1272 0 0 0 1236 0 0 0 0 3 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
 Mode: 644
 # ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+Path: fixtures/proc/net/unix
+Lines: 6
+Num       RefCount Protocol Flags    Type St Inode Path
+0000000000000000: 00000002 00000000 00010000 0001 01 3442596 /var/run/postgresql/.s.PGSQL.5432
+0000000000000000: 0000000a 00000000 00010000 0005 01 10061 /run/udev/control
+0000000000000000: 00000007 00000000 00000000 0002 01 12392 /dev/log
+0000000000000000: 00000003 00000000 00000000 0001 03 4787297 /var/run/postgresql/.s.PGSQL.5432
+0000000000000000: 00000003 00000000 00000000 0001 03 5091797
+Mode: 644
+# ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+Path: fixtures/proc/net/unix_without_inode
+Lines: 6
+Num       RefCount Protocol Flags    Type St Path
+0000000000000000: 00000002 00000000 00010000 0001 01 /var/run/postgresql/.s.PGSQL.5432
+0000000000000000: 0000000a 00000000 00010000 0005 01 /run/udev/control
+0000000000000000: 00000007 00000000 00000000 0002 01 /dev/log
+0000000000000000: 00000003 00000000 00000000 0001 03 /var/run/postgresql/.s.PGSQL.5432
+0000000000000000: 00000003 00000000 00000000 0001 03
+Mode: 644
+# ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 Path: fixtures/proc/net/xfrm_stat
 Lines: 28
 XfrmInError                     1
@@ -1107,6 +1185,22 @@ Mode: 644
 Directory: fixtures/sys/devices/system
 Mode: 775
 # ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+Directory: fixtures/sys/devices/system/clocksource
+Mode: 775
+# ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+Directory: fixtures/sys/devices/system/clocksource/clocksource0
+Mode: 775
+# ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+Path: fixtures/sys/devices/system/clocksource/clocksource0/available_clocksource
+Lines: 1
+tsc hpet acpi_pm 
+Mode: 444
+# ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+Path: fixtures/sys/devices/system/clocksource/clocksource0/current_clocksource
+Lines: 1
+tsc
+Mode: 644
+# ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 Directory: fixtures/sys/devices/system/cpu
 Mode: 775
 # ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

vendor/github.com/prometheus/procfs/fs.go

@@ -26,8 +26,14 @@ type FS struct {
 // DefaultMountPoint is the common mount point of the proc filesystem.
 const DefaultMountPoint = fs.DefaultProcMountPoint
 
+// NewDefaultFS returns a new proc FS mounted under the default proc mountPoint.
+// It will error if the mount point directory can't be read or is a file.
+func NewDefaultFS() (FS, error) {
+	return NewFS(DefaultMountPoint)
+}
+
 // NewFS returns a new proc FS mounted under the given proc mountPoint. It will error
-// if the mount point dirctory can't be read or is a file.
+// if the mount point directory can't be read or is a file.
 func NewFS(mountPoint string) (FS, error) {
 	fs, err := fs.NewFS(mountPoint)
 	if err != nil {

vendor/github.com/prometheus/procfs/ipvs.go

@@ -62,18 +62,8 @@ type IPVSBackendStatus struct {
 	Weight uint64
 }
 
-// NewIPVSStats reads the IPVS statistics.
+// IPVSStats reads the IPVS statistics from the specified `proc` filesystem.
-func NewIPVSStats() (IPVSStats, error) {
+func (fs FS) IPVSStats() (IPVSStats, error) {
-	fs, err := NewFS(DefaultMountPoint)
-	if err != nil {
-		return IPVSStats{}, err
-	}
-
-	return fs.NewIPVSStats()
-}
-
-// NewIPVSStats reads the IPVS statistics from the specified `proc` filesystem.
-func (fs FS) NewIPVSStats() (IPVSStats, error) {
 	file, err := os.Open(fs.proc.Path("net/ip_vs_stats"))
 	if err != nil {
 		return IPVSStats{}, err
@@ -131,18 +121,8 @@ func parseIPVSStats(file io.Reader) (IPVSStats, error) {
 	return stats, nil
 }
 
-// NewIPVSBackendStatus reads and returns the status of all (virtual,real) server pairs.
+// IPVSBackendStatus reads and returns the status of all (virtual,real) server pairs from the specified `proc` filesystem.
-func NewIPVSBackendStatus() ([]IPVSBackendStatus, error) {
+func (fs FS) IPVSBackendStatus() ([]IPVSBackendStatus, error) {
-	fs, err := NewFS(DefaultMountPoint)
-	if err != nil {
-		return []IPVSBackendStatus{}, err
-	}
-
-	return fs.NewIPVSBackendStatus()
-}
-
-// NewIPVSBackendStatus reads and returns the status of all (virtual,real) server pairs from the specified `proc` filesystem.
-func (fs FS) NewIPVSBackendStatus() ([]IPVSBackendStatus, error) {
 	file, err := os.Open(fs.proc.Path("net/ip_vs"))
 	if err != nil {
 		return nil, err

vendor/github.com/prometheus/procfs/mdstat.go

@@ -42,64 +42,64 @@ type MDStat struct {
 	BlocksSynced int64
 }
 
-// ParseMDStat parses an mdstat-file and returns a struct with the relevant infos.
+// MDStat parses an mdstat-file (/proc/mdstat) and returns a slice of
-func (fs FS) ParseMDStat() (mdstates []MDStat, err error) {
+// structs containing the relevant info.  More information available here:
-	mdStatusFilePath := fs.proc.Path("mdstat")
+// https://raid.wiki.kernel.org/index.php/Mdstat
-	content, err := ioutil.ReadFile(mdStatusFilePath)
+func (fs FS) MDStat() ([]MDStat, error) {
+	data, err := ioutil.ReadFile(fs.proc.Path("mdstat"))
 	if err != nil {
-		return []MDStat{}, fmt.Errorf("error parsing %s: %s", mdStatusFilePath, err)
+		return nil, fmt.Errorf("error parsing mdstat %s: %s", fs.proc.Path("mdstat"), err)
 	}
+	mdstat, err := parseMDStat(data)
+	if err != nil {
+		return nil, fmt.Errorf("error parsing mdstat %s: %s", fs.proc.Path("mdstat"), err)
+	}
+	return mdstat, nil
+}
 
-	mdStates := []MDStat{}
+// parseMDStat parses data from mdstat file (/proc/mdstat) and returns a slice of
-	lines := strings.Split(string(content), "\n")
+// structs containing the relevant info.
+func parseMDStat(mdstatData []byte) ([]MDStat, error) {
+	mdStats := []MDStat{}
+	lines := strings.Split(string(mdstatData), "\n")
 	for i, l := range lines {
-		if l == "" {
+		if strings.TrimSpace(l) == "" || l[0] == ' ' ||
-			continue
+			strings.HasPrefix(l, "Personalities") || strings.HasPrefix(l, "unused") {
-		}
-		if l[0] == ' ' {
-			continue
-		}
-		if strings.HasPrefix(l, "Personalities") || strings.HasPrefix(l, "unused") {
 			continue
 		}
 
-		mainLine := strings.Split(l, " ")
+		deviceFields := strings.Fields(l)
-		if len(mainLine) < 3 {
+		if len(deviceFields) < 3 {
-			return mdStates, fmt.Errorf("error parsing mdline: %s", l)
+			return nil, fmt.Errorf("not enough fields in mdline (expected at least 3): %s", l)
 		}
-		mdName := mainLine[0]
+		mdName := deviceFields[0]
-		activityState := mainLine[2]
+		activityState := deviceFields[2]
 
 		if len(lines) <= i+3 {
-			return mdStates, fmt.Errorf(
+			return mdStats, fmt.Errorf("missing lines for md device %s", mdName)
-				"error parsing %s: too few lines for md device %s",
-				mdStatusFilePath,
-				mdName,
-			)
 		}
 
-		active, total, size, err := evalStatusline(lines[i+1])
+		active, total, size, err := evalStatusLine(lines[i+1])
 		if err != nil {
-			return mdStates, fmt.Errorf("error parsing %s: %s", mdStatusFilePath, err)
+			return nil, err
 		}
 
-		// j is the line number of the syncing-line.
+		syncLineIdx := i + 2
-		j := i + 2
 		if strings.Contains(lines[i+2], "bitmap") { // skip bitmap line
-			j = i + 3
+			syncLineIdx++
 		}
 
-		// If device is syncing at the moment, get the number of currently
+		// If device is recovering/syncing at the moment, get the number of currently
 		// synced bytes, otherwise that number equals the size of the device.
 		syncedBlocks := size
-		if strings.Contains(lines[j], "recovery") || strings.Contains(lines[j], "resync") {
+		if strings.Contains(lines[syncLineIdx], "recovery") || strings.Contains(lines[syncLineIdx], "resync") {
-			syncedBlocks, err = evalBuildline(lines[j])
+			syncedBlocks, err = evalRecoveryLine(lines[syncLineIdx])
 			if err != nil {
-				return mdStates, fmt.Errorf("error parsing %s: %s", mdStatusFilePath, err)
+				return nil, err
 			}
 		}
 
-		mdStates = append(mdStates, MDStat{
+		mdStats = append(mdStats, MDStat{
 			Name:          mdName,
 			ActivityState: activityState,
 			DisksActive:   active,
@@ -109,10 +109,10 @@ func (fs FS) ParseMDStat() (mdstates []MDStat, err error) {
 		})
 	}
 
-	return mdStates, nil
+	return mdStats, nil
 }
 
-func evalStatusline(statusline string) (active, total, size int64, err error) {
+func evalStatusLine(statusline string) (active, total, size int64, err error) {
 	matches := statuslineRE.FindStringSubmatch(statusline)
 	if len(matches) != 4 {
 		return 0, 0, 0, fmt.Errorf("unexpected statusline: %s", statusline)
@@ -136,7 +136,7 @@ func evalStatusline(statusline string) (active, total, size int64, err error) {
 	return active, total, size, nil
 }
 
-func evalBuildline(buildline string) (syncedBlocks int64, err error) {
+func evalRecoveryLine(buildline string) (syncedBlocks int64, err error) {
 	matches := buildlineRE.FindStringSubmatch(buildline)
 	if len(matches) != 2 {
 		return 0, fmt.Errorf("unexpected buildline: %s", buildline)

vendor/github.com/prometheus/procfs/mountstats.go

@@ -69,8 +69,8 @@ type MountStats interface {
 type MountStatsNFS struct {
 	// The version of statistics provided.
 	StatVersion string
-	// The optional mountaddr of the NFS mount.
+	// The mount options of the NFS mount.
-	MountAddress string
+	Opts map[string]string
 	// The age of the NFS mount.
 	Age time.Duration
 	// Statistics related to byte counters for various operations.
@@ -181,11 +181,11 @@ type NFSOperationStats struct {
 	// Number of bytes received for this operation, including RPC headers and payload.
 	BytesReceived uint64
 	// Duration all requests spent queued for transmission before they were sent.
-	CumulativeQueueTime time.Duration
+	CumulativeQueueMilliseconds uint64
 	// Duration it took to get a reply back after the request was transmitted.
-	CumulativeTotalResponseTime time.Duration
+	CumulativeTotalResponseMilliseconds uint64
 	// Duration from when a request was enqueued to when it was completely handled.
-	CumulativeTotalRequestTime time.Duration
+	CumulativeTotalRequestMilliseconds uint64
 }
 
 // A NFSTransportStats contains statistics for the NFS mount RPC requests and
@@ -204,7 +204,7 @@ type NFSTransportStats struct {
 	// spent waiting for connections to the server to be established.
 	ConnectIdleTime uint64
 	// Duration since the NFS mount last saw any RPC traffic.
-	IdleTime time.Duration
+	IdleTimeSeconds uint64
 	// Number of RPC requests for this mount sent to the NFS server.
 	Sends uint64
 	// Number of RPC responses for this mount received from the NFS server.
@@ -342,10 +342,15 @@ func parseMountStatsNFS(s *bufio.Scanner, statVersion string) (*MountStatsNFS, e
 
 		switch ss[0] {
 		case fieldOpts:
+			if stats.Opts == nil {
+				stats.Opts = map[string]string{}
+			}
 			for _, opt := range strings.Split(ss[1], ",") {
 				split := strings.Split(opt, "=")
-				if len(split) == 2 && split[0] == "mountaddr" {
+				if len(split) == 2 {
-					stats.MountAddress = split[1]
+					stats.Opts[split[0]] = split[1]
+				} else {
+					stats.Opts[opt] = ""
 				}
 			}
 		case fieldAge:
@@ -525,9 +530,9 @@ func parseNFSOperationStats(s *bufio.Scanner) ([]NFSOperationStats, error) {
 			MajorTimeouts:                       ns[2],
 			BytesSent:                           ns[3],
 			BytesReceived:                       ns[4],
-			CumulativeQueueTime:         time.Duration(ns[5]) * time.Millisecond,
+			CumulativeQueueMilliseconds:         ns[5],
-			CumulativeTotalResponseTime: time.Duration(ns[6]) * time.Millisecond,
+			CumulativeTotalResponseMilliseconds: ns[6],
-			CumulativeTotalRequestTime:  time.Duration(ns[7]) * time.Millisecond,
+			CumulativeTotalRequestMilliseconds:  ns[7],
 		})
 	}
 
@@ -603,7 +608,7 @@ func parseNFSTransportStats(ss []string, statVersion string) (*NFSTransportStats
 		Bind:                     ns[1],
 		Connect:                  ns[2],
 		ConnectIdleTime:          ns[3],
-		IdleTime:                 time.Duration(ns[4]) * time.Second,
+		IdleTimeSeconds:          ns[4],
 		Sends:                    ns[5],
 		Receives:                 ns[6],
 		BadTransactionIDs:        ns[7],

vendor/github.com/prometheus/procfs/net_dev.go

@@ -47,23 +47,13 @@ type NetDevLine struct {
 // are interface names.
 type NetDev map[string]NetDevLine
 
-// NewNetDev returns kernel/system statistics read from /proc/net/dev.
+// NetDev returns kernel/system statistics read from /proc/net/dev.
-func NewNetDev() (NetDev, error) {
+func (fs FS) NetDev() (NetDev, error) {
-	fs, err := NewFS(DefaultMountPoint)
-	if err != nil {
-		return nil, err
-	}
-
-	return fs.NewNetDev()
-}
-
-// NewNetDev returns kernel/system statistics read from /proc/net/dev.
-func (fs FS) NewNetDev() (NetDev, error) {
 	return newNetDev(fs.proc.Path("net/dev"))
 }
 
-// NewNetDev returns kernel/system statistics read from /proc/[pid]/net/dev.
+// NetDev returns kernel/system statistics read from /proc/[pid]/net/dev.
-func (p Proc) NewNetDev() (NetDev, error) {
+func (p Proc) NetDev() (NetDev, error) {
 	return newNetDev(p.path("net/dev"))
 }
 
@@ -75,7 +65,7 @@ func newNetDev(file string) (NetDev, error) {
 	}
 	defer f.Close()
 
-	nd := NetDev{}
+	netDev := NetDev{}
 	s := bufio.NewScanner(f)
 	for n := 0; s.Scan(); n++ {
 		// Skip the 2 header lines.
@@ -83,20 +73,20 @@ func newNetDev(file string) (NetDev, error) {
 			continue
 		}
 
-		line, err := nd.parseLine(s.Text())
+		line, err := netDev.parseLine(s.Text())
 		if err != nil {
-			return nd, err
+			return netDev, err
 		}
 
-		nd[line.Name] = *line
+		netDev[line.Name] = *line
 	}
 
-	return nd, s.Err()
+	return netDev, s.Err()
 }
 
 // parseLine parses a single line from the /proc/net/dev file. Header lines
 // must be filtered prior to calling this method.
-func (nd NetDev) parseLine(rawLine string) (*NetDevLine, error) {
+func (netDev NetDev) parseLine(rawLine string) (*NetDevLine, error) {
 	parts := strings.SplitN(rawLine, ":", 2)
 	if len(parts) != 2 {
 		return nil, errors.New("invalid net/dev line, missing colon")
@@ -185,11 +175,11 @@ func (nd NetDev) parseLine(rawLine string) (*NetDevLine, error) {
 
 // Total aggregates the values across interfaces and returns a new NetDevLine.
 // The Name field will be a sorted comma separated list of interface names.
-func (nd NetDev) Total() NetDevLine {
+func (netDev NetDev) Total() NetDevLine {
 	total := NetDevLine{}
 
-	names := make([]string, 0, len(nd))
+	names := make([]string, 0, len(netDev))
-	for _, ifc := range nd {
+	for _, ifc := range netDev {
 		names = append(names, ifc.Name)
 		total.RxBytes += ifc.RxBytes
 		total.RxPackets += ifc.RxPackets

vendor/github.com/prometheus/procfs/net_unix.go

@@ -0,0 +1,275 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package procfs
+
+import (
+	"bufio"
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"strconv"
+	"strings"
+)
+
+// For the proc file format details,
+// see https://elixir.bootlin.com/linux/v4.17/source/net/unix/af_unix.c#L2815
+// and https://elixir.bootlin.com/linux/latest/source/include/uapi/linux/net.h#L48.
+
+const (
+	netUnixKernelPtrIdx = iota
+	netUnixRefCountIdx
+	_
+	netUnixFlagsIdx
+	netUnixTypeIdx
+	netUnixStateIdx
+	netUnixInodeIdx
+
+	// Inode and Path are optional.
+	netUnixStaticFieldsCnt = 6
+)
+
+const (
+	netUnixTypeStream    = 1
+	netUnixTypeDgram     = 2
+	netUnixTypeSeqpacket = 5
+
+	netUnixFlagListen = 1 << 16
+
+	netUnixStateUnconnected  = 1
+	netUnixStateConnecting   = 2
+	netUnixStateConnected    = 3
+	netUnixStateDisconnected = 4
+)
+
+var errInvalidKernelPtrFmt = errors.New("Invalid Num(the kernel table slot number) format")
+
+// NetUnixType is the type of the type field.
+type NetUnixType uint64
+
+// NetUnixFlags is the type of the flags field.
+type NetUnixFlags uint64
+
+// NetUnixState is the type of the state field.
+type NetUnixState uint64
+
+// NetUnixLine represents a line of /proc/net/unix.
+type NetUnixLine struct {
+	KernelPtr string
+	RefCount  uint64
+	Protocol  uint64
+	Flags     NetUnixFlags
+	Type      NetUnixType
+	State     NetUnixState
+	Inode     uint64
+	Path      string
+}
+
+// NetUnix holds the data read from /proc/net/unix.
+type NetUnix struct {
+	Rows []*NetUnixLine
+}
+
+// NewNetUnix returns data read from /proc/net/unix.
+func NewNetUnix() (*NetUnix, error) {
+	fs, err := NewFS(DefaultMountPoint)
+	if err != nil {
+		return nil, err
+	}
+
+	return fs.NewNetUnix()
+}
+
+// NewNetUnix returns data read from /proc/net/unix.
+func (fs FS) NewNetUnix() (*NetUnix, error) {
+	return NewNetUnixByPath(fs.proc.Path("net/unix"))
+}
+
+// NewNetUnixByPath returns data read from /proc/net/unix by file path.
+// It might returns an error with partial parsed data, if an error occur after some data parsed.
+func NewNetUnixByPath(path string) (*NetUnix, error) {
+	f, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	defer f.Close()
+	return NewNetUnixByReader(f)
+}
+
+// NewNetUnixByReader returns data read from /proc/net/unix by a reader.
+// It might returns an error with partial parsed data, if an error occur after some data parsed.
+func NewNetUnixByReader(reader io.Reader) (*NetUnix, error) {
+	nu := &NetUnix{
+		Rows: make([]*NetUnixLine, 0, 32),
+	}
+	scanner := bufio.NewScanner(reader)
+	// Omit the header line.
+	scanner.Scan()
+	header := scanner.Text()
+	// From the man page of proc(5), it does not contain an Inode field,
+	// but in actually it exists.
+	// This code works for both cases.
+	hasInode := strings.Contains(header, "Inode")
+
+	minFieldsCnt := netUnixStaticFieldsCnt
+	if hasInode {
+		minFieldsCnt++
+	}
+	for scanner.Scan() {
+		line := scanner.Text()
+		item, err := nu.parseLine(line, hasInode, minFieldsCnt)
+		if err != nil {
+			return nu, err
+		}
+		nu.Rows = append(nu.Rows, item)
+	}
+
+	return nu, scanner.Err()
+}
+
+func (u *NetUnix) parseLine(line string, hasInode bool, minFieldsCnt int) (*NetUnixLine, error) {
+	fields := strings.Fields(line)
+	fieldsLen := len(fields)
+	if fieldsLen < minFieldsCnt {
+		return nil, fmt.Errorf(
+			"Parse Unix domain failed: expect at least %d fields but got %d",
+			minFieldsCnt, fieldsLen)
+	}
+	kernelPtr, err := u.parseKernelPtr(fields[netUnixKernelPtrIdx])
+	if err != nil {
+		return nil, fmt.Errorf("Parse Unix domain num(%s) failed: %s", fields[netUnixKernelPtrIdx], err)
+	}
+	users, err := u.parseUsers(fields[netUnixRefCountIdx])
+	if err != nil {
+		return nil, fmt.Errorf("Parse Unix domain ref count(%s) failed: %s", fields[netUnixRefCountIdx], err)
+	}
+	flags, err := u.parseFlags(fields[netUnixFlagsIdx])
+	if err != nil {
+		return nil, fmt.Errorf("Parse Unix domain flags(%s) failed: %s", fields[netUnixFlagsIdx], err)
+	}
+	typ, err := u.parseType(fields[netUnixTypeIdx])
+	if err != nil {
+		return nil, fmt.Errorf("Parse Unix domain type(%s) failed: %s", fields[netUnixTypeIdx], err)
+	}
+	state, err := u.parseState(fields[netUnixStateIdx])
+	if err != nil {
+		return nil, fmt.Errorf("Parse Unix domain state(%s) failed: %s", fields[netUnixStateIdx], err)
+	}
+	var inode uint64
+	if hasInode {
+		inodeStr := fields[netUnixInodeIdx]
+		inode, err = u.parseInode(inodeStr)
+		if err != nil {
+			return nil, fmt.Errorf("Parse Unix domain inode(%s) failed: %s", inodeStr, err)
+		}
+	}
+
+	nuLine := &NetUnixLine{
+		KernelPtr: kernelPtr,
+		RefCount:  users,
+		Type:      typ,
+		Flags:     flags,
+		State:     state,
+		Inode:     inode,
+	}
+
+	// Path field is optional.
+	if fieldsLen > minFieldsCnt {
+		pathIdx := netUnixInodeIdx + 1
+		if !hasInode {
+			pathIdx--
+		}
+		nuLine.Path = fields[pathIdx]
+	}
+
+	return nuLine, nil
+}
+
+func (u NetUnix) parseKernelPtr(str string) (string, error) {
+	if !strings.HasSuffix(str, ":") {
+		return "", errInvalidKernelPtrFmt
+	}
+	return str[:len(str)-1], nil
+}
+
+func (u NetUnix) parseUsers(hexStr string) (uint64, error) {
+	return strconv.ParseUint(hexStr, 16, 32)
+}
+
+func (u NetUnix) parseProtocol(hexStr string) (uint64, error) {
+	return strconv.ParseUint(hexStr, 16, 32)
+}
+
+func (u NetUnix) parseType(hexStr string) (NetUnixType, error) {
+	typ, err := strconv.ParseUint(hexStr, 16, 16)
+	if err != nil {
+		return 0, err
+	}
+	return NetUnixType(typ), nil
+}
+
+func (u NetUnix) parseFlags(hexStr string) (NetUnixFlags, error) {
+	flags, err := strconv.ParseUint(hexStr, 16, 32)
+	if err != nil {
+		return 0, err
+	}
+	return NetUnixFlags(flags), nil
+}
+
+func (u NetUnix) parseState(hexStr string) (NetUnixState, error) {
+	st, err := strconv.ParseInt(hexStr, 16, 8)
+	if err != nil {
+		return 0, err
+	}
+	return NetUnixState(st), nil
+}
+
+func (u NetUnix) parseInode(inodeStr string) (uint64, error) {
+	return strconv.ParseUint(inodeStr, 10, 64)
+}
+
+func (t NetUnixType) String() string {
+	switch t {
+	case netUnixTypeStream:
+		return "stream"
+	case netUnixTypeDgram:
+		return "dgram"
+	case netUnixTypeSeqpacket:
+		return "seqpacket"
+	}
+	return "unknown"
+}
+
+func (f NetUnixFlags) String() string {
+	switch f {
+	case netUnixFlagListen:
+		return "listen"
+	default:
+		return "default"
+	}
+}
+
+func (s NetUnixState) String() string {
+	switch s {
+	case netUnixStateUnconnected:
+		return "unconnected"
+	case netUnixStateConnecting:
+		return "connecting"
+	case netUnixStateConnected:
+		return "connected"
+	case netUnixStateDisconnected:
+		return "disconnected"
+	}
+	return "unknown"
+}

vendor/github.com/prometheus/procfs/proc.go

@@ -54,7 +54,7 @@ func NewProc(pid int) (Proc, error) {
 	if err != nil {
 		return Proc{}, err
 	}
-	return fs.NewProc(pid)
+	return fs.Proc(pid)
 }
 
 // AllProcs returns a list of all currently available processes under /proc.
@@ -76,11 +76,18 @@ func (fs FS) Self() (Proc, error) {
 	if err != nil {
 		return Proc{}, err
 	}
-	return fs.NewProc(pid)
+	return fs.Proc(pid)
 }
 
 // NewProc returns a process for the given pid.
+//
+// Deprecated: use fs.Proc() instead
 func (fs FS) NewProc(pid int) (Proc, error) {
+	return fs.Proc(pid)
+}
+
+// Proc returns a process for the given pid.
+func (fs FS) Proc(pid int) (Proc, error) {
 	if _, err := os.Stat(fs.proc.Path(strconv.Itoa(pid))); err != nil {
 		return Proc{}, err
 	}

vendor/github.com/prometheus/procfs/proc_io.go

@@ -39,8 +39,8 @@ type ProcIO struct {
 	CancelledWriteBytes int64
 }
 
-// NewIO creates a new ProcIO instance from a given Proc instance.
+// IO creates a new ProcIO instance from a given Proc instance.
-func (p Proc) NewIO() (ProcIO, error) {
+func (p Proc) IO() (ProcIO, error) {
 	pio := ProcIO{}
 
 	f, err := os.Open(p.path("io"))

vendor/github.com/prometheus/procfs/proc_limits.go

@@ -78,7 +78,14 @@ var (
 )
 
 // NewLimits returns the current soft limits of the process.
+//
+// Deprecated: use p.Limits() instead
 func (p Proc) NewLimits() (ProcLimits, error) {
+	return p.Limits()
+}
+
+// Limits returns the current soft limits of the process.
+func (p Proc) Limits() (ProcLimits, error) {
 	f, err := os.Open(p.path("limits"))
 	if err != nil {
 		return ProcLimits{}, err

vendor/github.com/prometheus/procfs/proc_ns.go

@@ -29,9 +29,9 @@ type Namespace struct {
 // Namespaces contains all of the namespaces that the process is contained in.
 type Namespaces map[string]Namespace
 
-// NewNamespaces reads from /proc/[pid/ns/* to get the namespaces of which the
+// Namespaces reads from /proc/<pid>/ns/* to get the namespaces of which the
 // process is a member.
-func (p Proc) NewNamespaces() (Namespaces, error) {
+func (p Proc) Namespaces() (Namespaces, error) {
 	d, err := os.Open(p.path("ns"))
 	if err != nil {
 		return nil, err

vendor/github.com/prometheus/procfs/proc_psi.go

@@ -51,19 +51,10 @@ type PSIStats struct {
 	Full *PSILine
 }
 
-// NewPSIStatsForResource reads pressure stall information for the specified
+// PSIStatsForResource reads pressure stall information for the specified
-// resource. At time of writing this can be either "cpu", "memory" or "io".
+// resource from /proc/pressure/<resource>. At time of writing this can be
-func NewPSIStatsForResource(resource string) (PSIStats, error) {
+// either "cpu", "memory" or "io".
-	fs, err := NewFS(DefaultMountPoint)
+func (fs FS) PSIStatsForResource(resource string) (PSIStats, error) {
-	if err != nil {
-		return PSIStats{}, err
-	}
-
-	return fs.NewPSIStatsForResource(resource)
-}
-
-// NewPSIStatsForResource reads pressure stall information from /proc/pressure/<resource>
-func (fs FS) NewPSIStatsForResource(resource string) (PSIStats, error) {
 	file, err := os.Open(fs.proc.Path(fmt.Sprintf("%s/%s", "pressure", resource)))
 	if err != nil {
 		return PSIStats{}, fmt.Errorf("psi_stats: unavailable for %s", resource)

vendor/github.com/prometheus/procfs/proc_stat.go

@@ -105,7 +105,14 @@ type ProcStat struct {
 }
 
 // NewStat returns the current status information of the process.
+//
+// Deprecated: use NewStat() instead
 func (p Proc) NewStat() (ProcStat, error) {
+	return p.Stat()
+}
+
+// Stat returns the current status information of the process.
+func (p Proc) Stat() (ProcStat, error) {
 	f, err := os.Open(p.path("stat"))
 	if err != nil {
 		return ProcStat{}, err
@@ -178,7 +185,7 @@ func (s ProcStat) ResidentMemory() int {
 // StartTime returns the unix timestamp of the process in seconds.
 func (s ProcStat) StartTime() (float64, error) {
 	fs := FS{proc: s.proc}
-	stat, err := fs.NewStat()
+	stat, err := fs.Stat()
 	if err != nil {
 		return 0, err
 	}

vendor/github.com/prometheus/procfs/proc_status.go

@@ -0,0 +1,162 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package procfs
+
+import (
+	"bytes"
+	"io/ioutil"
+	"os"
+	"strconv"
+	"strings"
+)
+
+// ProcStat provides status information about the process,
+// read from /proc/[pid]/stat.
+type ProcStatus struct {
+	// The process ID.
+	PID int
+	// The process name.
+	Name string
+
+	// Peak virtual memory size.
+	VmPeak uint64
+	// Virtual memory size.
+	VmSize uint64
+	// Locked memory size.
+	VmLck uint64
+	// Pinned memory size.
+	VmPin uint64
+	// Peak resident set size.
+	VmHWM uint64
+	// Resident set size (sum of RssAnnon RssFile and RssShmem).
+	VmRSS uint64
+	// Size of resident anonymous memory.
+	RssAnon uint64
+	// Size of resident file mappings.
+	RssFile uint64
+	// Size of resident shared memory.
+	RssShmem uint64
+	// Size of data segments.
+	VmData uint64
+	// Size of stack segments.
+	VmStk uint64
+	// Size of text segments.
+	VmExe uint64
+	// Shared library code size.
+	VmLib uint64
+	// Page table entries size.
+	VmPTE uint64
+	// Size of second-level page tables.
+	VmPMD uint64
+	// Swapped-out virtual memory size by anonymous private.
+	VmSwap uint64
+	// Size of hugetlb memory portions
+	HugetlbPages uint64
+
+	// Number of voluntary context switches.
+	VoluntaryCtxtSwitches uint64
+	// Number of involuntary context switches.
+	NonVoluntaryCtxtSwitches uint64
+}
+
+// NewStatus returns the current status information of the process.
+func (p Proc) NewStatus() (ProcStatus, error) {
+	f, err := os.Open(p.path("status"))
+	if err != nil {
+		return ProcStatus{}, err
+	}
+	defer f.Close()
+
+	data, err := ioutil.ReadAll(f)
+	if err != nil {
+		return ProcStatus{}, err
+	}
+
+	s := ProcStatus{PID: p.PID}
+
+	lines := strings.Split(string(data), "\n")
+	for _, line := range lines {
+		if !bytes.Contains([]byte(line), []byte(":")) {
+			continue
+		}
+
+		kv := strings.SplitN(line, ":", 2)
+
+		// removes spaces
+		k := string(strings.TrimSpace(kv[0]))
+		v := string(strings.TrimSpace(kv[1]))
+		// removes "kB"
+		v = string(bytes.Trim([]byte(v), " kB"))
+
+		// value to int when possible
+		// we can skip error check here, 'cause vKBytes is not used when value is a string
+		vKBytes, _ := strconv.ParseUint(v, 10, 64)
+		// convert kB to B
+		vBytes := vKBytes * 1024
+
+		s.fillStatus(k, v, vKBytes, vBytes)
+	}
+
+	return s, nil
+}
+
+func (s *ProcStatus) fillStatus(k string, vString string, vUint uint64, vUintBytes uint64) {
+	switch k {
+	case "Name":
+		s.Name = vString
+	case "VmPeak":
+		s.VmPeak = vUintBytes
+	case "VmSize":
+		s.VmSize = vUintBytes
+	case "VmLck":
+		s.VmLck = vUintBytes
+	case "VmPin":
+		s.VmPin = vUintBytes
+	case "VmHWM":
+		s.VmHWM = vUintBytes
+	case "VmRSS":
+		s.VmRSS = vUintBytes
+	case "RssAnon":
+		s.RssAnon = vUintBytes
+	case "RssFile":
+		s.RssFile = vUintBytes
+	case "RssShmem":
+		s.RssShmem = vUintBytes
+	case "VmData":
+		s.VmData = vUintBytes
+	case "VmStk":
+		s.VmStk = vUintBytes
+	case "VmExe":
+		s.VmExe = vUintBytes
+	case "VmLib":
+		s.VmLib = vUintBytes
+	case "VmPTE":
+		s.VmPTE = vUintBytes
+	case "VmPMD":
+		s.VmPMD = vUintBytes
+	case "VmSwap":
+		s.VmSwap = vUintBytes
+	case "HugetlbPages":
+		s.HugetlbPages = vUintBytes
+	case "voluntary_ctxt_switches":
+		s.VoluntaryCtxtSwitches = vUint
+	case "nonvoluntary_ctxt_switches":
+		s.NonVoluntaryCtxtSwitches = vUint
+	}
+}
+
+// TotalCtxtSwitches returns the total context switch.
+func (s ProcStatus) TotalCtxtSwitches() uint64 {
+	return s.VoluntaryCtxtSwitches + s.NonVoluntaryCtxtSwitches
+}

vendor/github.com/prometheus/procfs/stat.go

@@ -20,6 +20,8 @@ import (
 	"os"
 	"strconv"
 	"strings"
+
+	"github.com/prometheus/procfs/internal/fs"
 )
 
 // CPUStat shows how much time the cpu spend in various stages.
@@ -78,16 +80,6 @@ type Stat struct {
 	SoftIRQ SoftIRQStat
 }
 
-// NewStat returns kernel/system statistics read from /proc/stat.
-func NewStat() (Stat, error) {
-	fs, err := NewFS(DefaultMountPoint)
-	if err != nil {
-		return Stat{}, err
-	}
-
-	return fs.NewStat()
-}
-
 // Parse a cpu statistics line and returns the CPUStat struct plus the cpu id (or -1 for the overall sum).
 func parseCPUStat(line string) (CPUStat, int64, error) {
 	cpuStat := CPUStat{}
@@ -149,9 +141,29 @@ func parseSoftIRQStat(line string) (SoftIRQStat, uint64, error) {
 	return softIRQStat, total, nil
 }
 
-// NewStat returns an information about current kernel/system statistics.
+// NewStat returns information about current cpu/process statistics.
+// See https://www.kernel.org/doc/Documentation/filesystems/proc.txt
+//
+// Deprecated: use fs.Stat() instead
+func NewStat() (Stat, error) {
+	fs, err := NewFS(fs.DefaultProcMountPoint)
+	if err != nil {
+		return Stat{}, err
+	}
+	return fs.Stat()
+}
+
+// NewStat returns information about current cpu/process statistics.
+// See https://www.kernel.org/doc/Documentation/filesystems/proc.txt
+//
+// Deprecated: use fs.Stat() instead
 func (fs FS) NewStat() (Stat, error) {
-	// See https://www.kernel.org/doc/Documentation/filesystems/proc.txt
+	return fs.Stat()
+}
+
+// Stat returns information about current cpu/process statistics.
+// See https://www.kernel.org/doc/Documentation/filesystems/proc.txt
+func (fs FS) Stat() (Stat, error) {
 
 	f, err := os.Open(fs.proc.Path("stat"))
 	if err != nil {

vendor/github.com/prometheus/procfs/ttar

@@ -88,6 +88,8 @@ Usage:   $bname [-C <DIR>] -c -f <ARCHIVE> <FILE...> (create archive)
 Options:
          -C <DIR>           (change directory)
          -v                 (verbose)
+         --recursive-unlink (recursively delete existing directory if path
+                             collides with file or directory to extract)
 
 Example: Change to sysfs directory, create ttar file from fixtures directory
          $bname -C sysfs -c -f sysfs/fixtures.ttar fixtures/
@@ -111,8 +113,9 @@ function set_cmd {
 }
 
 unset VERBOSE
+unset RECURSIVE_UNLINK
 
-while getopts :cf:htxvC: opt; do
+while getopts :cf:-:htxvC: opt; do
     case $opt in
         c)
             set_cmd "create"
@@ -136,6 +139,18 @@ while getopts :cf:htxvC: opt; do
         C)
             CDIR=$OPTARG
             ;;
+        -)
+            case $OPTARG in
+                recursive-unlink)
+                    RECURSIVE_UNLINK="yes"
+                    ;;
+                *)
+                    echo -e "Error: invalid option -$OPTARG"
+                    echo
+                    usage 1
+                    ;;
+            esac
+            ;;
         *)
             echo >&2 "ERROR: invalid option -$OPTARG"
             echo
@@ -212,16 +227,16 @@ function extract {
         local eof_without_newline
         if [ "$size" -gt 0 ]; then
             if [[ "$line" =~ [^\\]EOF ]]; then
-                # An EOF not preceeded by a backslash indicates that the line
+                # An EOF not preceded by a backslash indicates that the line
                 # does not end with a newline
                 eof_without_newline=1
             else
                 eof_without_newline=0
             fi
             # Replace NULLBYTE with null byte if at beginning of line
-            # Replace NULLBYTE with null byte unless preceeded by backslash
+            # Replace NULLBYTE with null byte unless preceded by backslash
             # Remove one backslash in front of NULLBYTE (if any)
-            # Remove EOF unless preceeded by backslash
+            # Remove EOF unless preceded by backslash
             # Remove one backslash in front of EOF
             if [ $USE_PYTHON -eq 1 ]; then
                 echo -n "$line" | python -c "$PYTHON_EXTRACT_FILTER" >> "$path"
@@ -245,7 +260,16 @@ function extract {
         fi
         if [[ $line =~ ^Path:\ (.*)$ ]]; then
             path=${BASH_REMATCH[1]}
-            if [ -e "$path" ] || [ -L "$path" ]; then
+            if [ -L "$path" ]; then
+                rm "$path"
+            elif [ -d "$path" ]; then
+                if [ "${RECURSIVE_UNLINK:-}" == "yes" ]; then
+                    rm -r "$path"
+                else
+                    # Safe because symlinks to directories are dealt with above
+                    rmdir "$path"
+                fi
+            elif [ -e "$path" ]; then
                 rm "$path"
             fi
         elif [[ $line =~ ^Lines:\ (.*)$ ]]; then

vendor/modules.txt

@@ -183,7 +183,7 @@ github.com/influxdata/influxdb/models
 github.com/influxdata/influxdb/pkg/escape
 # github.com/jmespath/go-jmespath v0.0.0-20160803190731-bd40a432e4c7
 github.com/jmespath/go-jmespath
-# github.com/json-iterator/go v1.1.5
+# github.com/json-iterator/go v1.1.6
 github.com/json-iterator/go
 # github.com/julienschmidt/httprouter v1.2.0
 github.com/julienschmidt/httprouter
@@ -219,7 +219,7 @@ github.com/petermattis/goid
 github.com/pkg/errors
 # github.com/pmezard/go-difflib v1.0.0
 github.com/pmezard/go-difflib/difflib
-# github.com/prometheus/client_golang v0.9.3
+# github.com/prometheus/client_golang v1.0.0
 github.com/prometheus/client_golang/prometheus
 github.com/prometheus/client_golang/api
 github.com/prometheus/client_golang/api/prometheus/v1
@@ -229,7 +229,7 @@ github.com/prometheus/client_golang/prometheus/internal
 github.com/prometheus/client_golang/prometheus/testutil
 # github.com/prometheus/client_model v0.0.0-20190129233127-fd36f4220a90
 github.com/prometheus/client_model/go
-# github.com/prometheus/common v0.4.0
+# github.com/prometheus/common v0.4.1
 github.com/prometheus/common/model
 github.com/prometheus/common/promlog
 github.com/prometheus/common/promlog/flag
@@ -239,7 +239,7 @@ github.com/prometheus/common/expfmt
 github.com/prometheus/common/route
 github.com/prometheus/common/server
 github.com/prometheus/common/internal/bitbucket.org/ww/goautoneg
-# github.com/prometheus/procfs v0.0.0-20190507164030-5867b95ac084
+# github.com/prometheus/procfs v0.0.2
 github.com/prometheus/procfs
 github.com/prometheus/procfs/internal/fs
 # github.com/prometheus/tsdb v0.8.0
@@ -316,8 +316,8 @@ golang.org/x/oauth2/jwt
 golang.org/x/sync/errgroup
 golang.org/x/sync/semaphore
 # golang.org/x/sys v0.0.0-20190403152447-81d4e9dc473e
-golang.org/x/sys/unix
 golang.org/x/sys/windows
+golang.org/x/sys/unix
 # golang.org/x/text v0.3.0
 golang.org/x/text/secure/bidirule
 golang.org/x/text/unicode/bidi