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408 lines
12 KiB
408 lines
12 KiB
// Copyright 2015 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//go:build !nodiskstats
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// +build !nodiskstats
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package collector
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import (
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"bufio"
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"fmt"
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"os"
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"strconv"
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"strings"
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"github.com/go-kit/log"
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"github.com/go-kit/log/level"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/procfs/blockdevice"
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)
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const (
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secondsPerTick = 1.0 / 1000.0
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// Read sectors and write sectors are the "standard UNIX 512-byte sectors, not any device- or filesystem-specific block size."
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// See also https://www.kernel.org/doc/Documentation/block/stat.txt
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unixSectorSize = 512.0
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diskstatsDefaultIgnoredDevices = "^(z?ram|loop|fd|(h|s|v|xv)d[a-z]|nvme\\d+n\\d+p)\\d+$"
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// See udevadm(8).
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udevDevicePropertyPrefix = "E:"
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// Udev device properties.
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udevDMLVLayer = "DM_LV_LAYER"
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udevDMLVName = "DM_LV_NAME"
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udevDMName = "DM_NAME"
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udevDMUUID = "DM_UUID"
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udevDMVGName = "DM_VG_NAME"
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udevIDATA = "ID_ATA"
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udevIDATARotationRateRPM = "ID_ATA_ROTATION_RATE_RPM"
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udevIDATASATA = "ID_ATA_SATA"
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udevIDATASATASignalRateGen1 = "ID_ATA_SATA_SIGNAL_RATE_GEN1"
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udevIDATASATASignalRateGen2 = "ID_ATA_SATA_SIGNAL_RATE_GEN2"
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udevIDATAWriteCache = "ID_ATA_WRITE_CACHE"
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udevIDATAWriteCacheEnabled = "ID_ATA_WRITE_CACHE_ENABLED"
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udevIDFSType = "ID_FS_TYPE"
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udevIDFSUsage = "ID_FS_USAGE"
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udevIDFSUUID = "ID_FS_UUID"
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udevIDFSVersion = "ID_FS_VERSION"
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udevIDModel = "ID_MODEL"
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udevIDPath = "ID_PATH"
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udevIDRevision = "ID_REVISION"
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udevIDSerialShort = "ID_SERIAL_SHORT"
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udevIDWWN = "ID_WWN"
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udevSCSIIdentSerial = "SCSI_IDENT_SERIAL"
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)
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type typedFactorDesc struct {
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desc *prometheus.Desc
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valueType prometheus.ValueType
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}
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type udevInfo map[string]string
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func (d *typedFactorDesc) mustNewConstMetric(value float64, labels ...string) prometheus.Metric {
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return prometheus.MustNewConstMetric(d.desc, d.valueType, value, labels...)
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}
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type diskstatsCollector struct {
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deviceFilter deviceFilter
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fs blockdevice.FS
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infoDesc typedFactorDesc
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descs []typedFactorDesc
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filesystemInfoDesc typedFactorDesc
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deviceMapperInfoDesc typedFactorDesc
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ataDescs map[string]typedFactorDesc
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logger log.Logger
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getUdevDeviceProperties func(uint32, uint32) (udevInfo, error)
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}
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func init() {
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registerCollector("diskstats", defaultEnabled, NewDiskstatsCollector)
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}
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// NewDiskstatsCollector returns a new Collector exposing disk device stats.
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// Docs from https://www.kernel.org/doc/Documentation/iostats.txt
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func NewDiskstatsCollector(logger log.Logger) (Collector, error) {
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var diskLabelNames = []string{"device"}
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fs, err := blockdevice.NewFS(*procPath, *sysPath)
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if err != nil {
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return nil, fmt.Errorf("failed to open sysfs: %w", err)
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}
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deviceFilter, err := newDiskstatsDeviceFilter(logger)
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if err != nil {
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return nil, fmt.Errorf("failed to parse device filter flags: %w", err)
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}
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collector := diskstatsCollector{
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deviceFilter: deviceFilter,
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fs: fs,
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infoDesc: typedFactorDesc{
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desc: prometheus.NewDesc(prometheus.BuildFQName(namespace, diskSubsystem, "info"),
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"Info of /sys/block/<block_device>.",
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[]string{"device", "major", "minor", "path", "wwn", "model", "serial", "revision"},
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nil,
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), valueType: prometheus.GaugeValue,
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},
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descs: []typedFactorDesc{
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{
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desc: readsCompletedDesc, valueType: prometheus.CounterValue,
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},
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{
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desc: prometheus.NewDesc(
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prometheus.BuildFQName(namespace, diskSubsystem, "reads_merged_total"),
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"The total number of reads merged.",
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diskLabelNames,
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nil,
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), valueType: prometheus.CounterValue,
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},
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{
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desc: readBytesDesc, valueType: prometheus.CounterValue,
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},
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{
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desc: readTimeSecondsDesc, valueType: prometheus.CounterValue,
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},
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{
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desc: writesCompletedDesc, valueType: prometheus.CounterValue,
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},
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{
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desc: prometheus.NewDesc(
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prometheus.BuildFQName(namespace, diskSubsystem, "writes_merged_total"),
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"The number of writes merged.",
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diskLabelNames,
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nil,
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), valueType: prometheus.CounterValue,
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},
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{
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desc: writtenBytesDesc, valueType: prometheus.CounterValue,
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},
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{
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desc: writeTimeSecondsDesc, valueType: prometheus.CounterValue,
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},
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{
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desc: prometheus.NewDesc(
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prometheus.BuildFQName(namespace, diskSubsystem, "io_now"),
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"The number of I/Os currently in progress.",
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diskLabelNames,
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nil,
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), valueType: prometheus.GaugeValue,
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},
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{
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desc: ioTimeSecondsDesc, valueType: prometheus.CounterValue,
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},
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{
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desc: prometheus.NewDesc(
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prometheus.BuildFQName(namespace, diskSubsystem, "io_time_weighted_seconds_total"),
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"The weighted # of seconds spent doing I/Os.",
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diskLabelNames,
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nil,
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), valueType: prometheus.CounterValue,
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},
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{
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desc: prometheus.NewDesc(
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prometheus.BuildFQName(namespace, diskSubsystem, "discards_completed_total"),
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"The total number of discards completed successfully.",
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diskLabelNames,
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nil,
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), valueType: prometheus.CounterValue,
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},
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{
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desc: prometheus.NewDesc(
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prometheus.BuildFQName(namespace, diskSubsystem, "discards_merged_total"),
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"The total number of discards merged.",
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diskLabelNames,
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nil,
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), valueType: prometheus.CounterValue,
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},
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{
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desc: prometheus.NewDesc(
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prometheus.BuildFQName(namespace, diskSubsystem, "discarded_sectors_total"),
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"The total number of sectors discarded successfully.",
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diskLabelNames,
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nil,
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), valueType: prometheus.CounterValue,
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},
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{
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desc: prometheus.NewDesc(
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prometheus.BuildFQName(namespace, diskSubsystem, "discard_time_seconds_total"),
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"This is the total number of seconds spent by all discards.",
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diskLabelNames,
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nil,
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), valueType: prometheus.CounterValue,
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},
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{
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desc: prometheus.NewDesc(
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prometheus.BuildFQName(namespace, diskSubsystem, "flush_requests_total"),
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"The total number of flush requests completed successfully",
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diskLabelNames,
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nil,
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), valueType: prometheus.CounterValue,
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},
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{
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desc: prometheus.NewDesc(
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prometheus.BuildFQName(namespace, diskSubsystem, "flush_requests_time_seconds_total"),
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"This is the total number of seconds spent by all flush requests.",
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diskLabelNames,
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nil,
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), valueType: prometheus.CounterValue,
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},
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},
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filesystemInfoDesc: typedFactorDesc{
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desc: prometheus.NewDesc(prometheus.BuildFQName(namespace, diskSubsystem, "filesystem_info"),
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"Info about disk filesystem.",
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[]string{"device", "type", "usage", "uuid", "version"},
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nil,
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), valueType: prometheus.GaugeValue,
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},
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deviceMapperInfoDesc: typedFactorDesc{
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desc: prometheus.NewDesc(prometheus.BuildFQName(namespace, diskSubsystem, "device_mapper_info"),
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"Info about disk device mapper.",
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[]string{"device", "name", "uuid", "vg_name", "lv_name", "lv_layer"},
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nil,
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), valueType: prometheus.GaugeValue,
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},
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ataDescs: map[string]typedFactorDesc{
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udevIDATAWriteCache: {
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desc: prometheus.NewDesc(prometheus.BuildFQName(namespace, diskSubsystem, "ata_write_cache"),
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"ATA disk has a write cache.",
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[]string{"device"},
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nil,
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), valueType: prometheus.GaugeValue,
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},
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udevIDATAWriteCacheEnabled: {
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desc: prometheus.NewDesc(prometheus.BuildFQName(namespace, diskSubsystem, "ata_write_cache_enabled"),
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"ATA disk has its write cache enabled.",
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[]string{"device"},
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nil,
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), valueType: prometheus.GaugeValue,
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},
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udevIDATARotationRateRPM: {
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desc: prometheus.NewDesc(prometheus.BuildFQName(namespace, diskSubsystem, "ata_rotation_rate_rpm"),
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"ATA disk rotation rate in RPMs (0 for SSDs).",
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[]string{"device"},
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nil,
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), valueType: prometheus.GaugeValue,
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},
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},
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logger: logger,
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}
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// Only enable getting device properties from udev if the directory is readable.
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if stat, err := os.Stat(*udevDataPath); err != nil || !stat.IsDir() {
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level.Error(logger).Log("msg", "Failed to open directory, disabling udev device properties", "path", *udevDataPath)
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} else {
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collector.getUdevDeviceProperties = getUdevDeviceProperties
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}
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return &collector, nil
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}
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func (c *diskstatsCollector) Update(ch chan<- prometheus.Metric) error {
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diskStats, err := c.fs.ProcDiskstats()
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if err != nil {
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return fmt.Errorf("couldn't get diskstats: %w", err)
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}
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for _, stats := range diskStats {
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dev := stats.DeviceName
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if c.deviceFilter.ignored(dev) {
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continue
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}
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info, err := getUdevDeviceProperties(stats.MajorNumber, stats.MinorNumber)
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if err != nil {
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level.Debug(c.logger).Log("msg", "Failed to parse udev info", "err", err)
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}
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// This is usually the serial printed on the disk label.
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serial := info[udevSCSIIdentSerial]
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// If it's undefined, fallback to ID_SERIAL_SHORT instead.
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if serial == "" {
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serial = info[udevIDSerialShort]
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}
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ch <- c.infoDesc.mustNewConstMetric(1.0, dev,
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fmt.Sprint(stats.MajorNumber),
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fmt.Sprint(stats.MinorNumber),
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info[udevIDPath],
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info[udevIDWWN],
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info[udevIDModel],
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serial,
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info[udevIDRevision],
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)
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statCount := stats.IoStatsCount - 3 // Total diskstats record count, less MajorNumber, MinorNumber and DeviceName
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for i, val := range []float64{
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float64(stats.ReadIOs),
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float64(stats.ReadMerges),
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float64(stats.ReadSectors) * unixSectorSize,
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float64(stats.ReadTicks) * secondsPerTick,
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float64(stats.WriteIOs),
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float64(stats.WriteMerges),
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float64(stats.WriteSectors) * unixSectorSize,
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float64(stats.WriteTicks) * secondsPerTick,
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float64(stats.IOsInProgress),
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float64(stats.IOsTotalTicks) * secondsPerTick,
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float64(stats.WeightedIOTicks) * secondsPerTick,
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float64(stats.DiscardIOs),
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float64(stats.DiscardMerges),
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float64(stats.DiscardSectors),
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float64(stats.DiscardTicks) * secondsPerTick,
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float64(stats.FlushRequestsCompleted),
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float64(stats.TimeSpentFlushing) * secondsPerTick,
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} {
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if i >= statCount {
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break
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}
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ch <- c.descs[i].mustNewConstMetric(val, dev)
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}
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if fsType := info[udevIDFSType]; fsType != "" {
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ch <- c.filesystemInfoDesc.mustNewConstMetric(1.0, dev,
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fsType,
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info[udevIDFSUsage],
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info[udevIDFSUUID],
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info[udevIDFSVersion],
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)
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}
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if name := info[udevDMName]; name != "" {
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ch <- c.deviceMapperInfoDesc.mustNewConstMetric(1.0, dev,
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name,
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info[udevDMUUID],
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info[udevDMVGName],
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info[udevDMLVName],
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info[udevDMLVLayer],
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)
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}
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if ata := info[udevIDATA]; ata != "" {
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for attr, desc := range c.ataDescs {
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str, ok := info[attr]
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if !ok {
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level.Debug(c.logger).Log("msg", "Udev attribute does not exist", "attribute", attr)
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continue
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}
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if value, err := strconv.ParseFloat(str, 64); err == nil {
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ch <- desc.mustNewConstMetric(value, dev)
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} else {
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level.Error(c.logger).Log("msg", "Failed to parse ATA value", "err", err)
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}
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}
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}
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}
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return nil
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}
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func getUdevDeviceProperties(major, minor uint32) (udevInfo, error) {
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filename := udevDataFilePath(fmt.Sprintf("b%d:%d", major, minor))
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data, err := os.Open(filename)
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if err != nil {
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return nil, err
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}
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defer data.Close()
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info := make(udevInfo)
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scanner := bufio.NewScanner(data)
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for scanner.Scan() {
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line := scanner.Text()
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// We're only interested in device properties.
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if !strings.HasPrefix(line, udevDevicePropertyPrefix) {
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continue
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}
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line = strings.TrimPrefix(line, udevDevicePropertyPrefix)
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/* TODO: After we drop support for Go 1.17, the condition below can be simplified to:
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if name, value, found := strings.Cut(line, "="); found {
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info[name] = value
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}
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*/
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if fields := strings.SplitN(line, "=", 2); len(fields) == 2 {
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info[fields[0]] = fields[1]
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}
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}
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return info, nil
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}
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