Remove no-default-scrape-port featureFlag

Signed-off-by: Alex Johnson <alex.kattathra.johnson@gmail.com>

cmd/prometheus/main.go

@@ -217,9 +217,6 @@ func (c *flagConfig) setFeatureListOptions(logger log.Logger) error {
 			case "concurrent-rule-eval":
 				c.enableConcurrentRuleEval = true
 				level.Info(logger).Log("msg", "Experimental concurrent rule evaluation enabled.")
-			case "no-default-scrape-port":
-				c.scrape.NoDefaultPort = true
-				level.Info(logger).Log("msg", "No default port will be appended to scrape targets' addresses.")
 			case "promql-experimental-functions":
 				parser.EnableExperimentalFunctions = true
 				level.Info(logger).Log("msg", "Experimental PromQL functions enabled.")
@@ -474,7 +471,7 @@ func main() {
 	a.Flag("scrape.discovery-reload-interval", "Interval used by scrape manager to throttle target groups updates.").
 		Hidden().Default("5s").SetValue(&cfg.scrape.DiscoveryReloadInterval)
 
-	a.Flag("enable-feature", "Comma separated feature names to enable. Valid options: auto-gomemlimit, exemplar-storage, expand-external-labels, memory-snapshot-on-shutdown, promql-per-step-stats, promql-experimental-functions, extra-scrape-metrics, auto-gomaxprocs, no-default-scrape-port, native-histograms, otlp-write-receiver, created-timestamp-zero-ingestion, concurrent-rule-eval, delayed-compaction, old-ui. See https://prometheus.io/docs/prometheus/latest/feature_flags/ for more details.").
+	a.Flag("enable-feature", "Comma separated feature names to enable. Valid options: auto-gomemlimit, exemplar-storage, expand-external-labels, memory-snapshot-on-shutdown, promql-per-step-stats, promql-experimental-functions, extra-scrape-metrics, auto-gomaxprocs, native-histograms, otlp-write-receiver, created-timestamp-zero-ingestion, concurrent-rule-eval, delayed-compaction, old-ui. See https://prometheus.io/docs/prometheus/latest/feature_flags/ for more details.").
 		Default("").StringsVar(&cfg.featureList)
 
 	a.Flag("agent", "Run Prometheus in 'Agent mode'.").BoolVar(&agentMode)

cmd/promtool/main.go

@@ -291,7 +291,7 @@ func main() {
 	promQLLabelsDeleteQuery := promQLLabelsDeleteCmd.Arg("query", "PromQL query.").Required().String()
 	promQLLabelsDeleteName := promQLLabelsDeleteCmd.Arg("name", "Name of the label to delete.").Required().String()
 
-	featureList := app.Flag("enable-feature", "Comma separated feature names to enable (only PromQL related and no-default-scrape-port). See https://prometheus.io/docs/prometheus/latest/feature_flags/ for the options and more details.").Default("").Strings()
+	featureList := app.Flag("enable-feature", "Comma separated feature names to enable. Currently unused.").Default("").Strings()
 
 	documentationCmd := app.Command("write-documentation", "Generate command line documentation. Internal use.").Hidden()
 
@@ -321,24 +321,21 @@ func main() {
 		}
 	}
 
-	var noDefaultScrapePort bool
 	for _, f := range *featureList {
 		opts := strings.Split(f, ",")
 		for _, o := range opts {
 			switch o {
-			case "no-default-scrape-port":
-				noDefaultScrapePort = true
 			case "":
 				continue
 			default:
-				fmt.Printf("  WARNING: Unknown option for --enable-feature: %q\n", o)
+				fmt.Printf("  WARNING: --enable-feature is currently a no-op")
 			}
 		}
 	}
 
 	switch parsedCmd {
 	case sdCheckCmd.FullCommand():
-		os.Exit(CheckSD(*sdConfigFile, *sdJobName, *sdTimeout, noDefaultScrapePort, prometheus.DefaultRegisterer))
+		os.Exit(CheckSD(*sdConfigFile, *sdJobName, *sdTimeout, prometheus.DefaultRegisterer))
 
 	case checkConfigCmd.FullCommand():
 		os.Exit(CheckConfig(*agentMode, *checkConfigSyntaxOnly, newLintConfig(*checkConfigLint, *checkConfigLintFatal), *configFiles...))
@@ -1219,7 +1216,7 @@ func checkTargetGroupsForScrapeConfig(targetGroups []*targetgroup.Group, scfg *c
 	lb := labels.NewBuilder(labels.EmptyLabels())
 	for _, tg := range targetGroups {
 		var failures []error
-		targets, failures = scrape.TargetsFromGroup(tg, scfg, false, targets, lb)
+		targets, failures = scrape.TargetsFromGroup(tg, scfg, targets, lb)
 		if len(failures) > 0 {
 			first := failures[0]
 			return first

cmd/promtool/sd.go

@@ -38,7 +38,7 @@ type sdCheckResult struct {
 }
 
 // CheckSD performs service discovery for the given job name and reports the results.
-func CheckSD(sdConfigFiles, sdJobName string, sdTimeout time.Duration, noDefaultScrapePort bool, registerer prometheus.Registerer) int {
+func CheckSD(sdConfigFiles, sdJobName string, sdTimeout time.Duration, registerer prometheus.Registerer) int {
 	logger := log.NewLogfmtLogger(log.NewSyncWriter(os.Stderr))
 
 	cfg, err := config.LoadFile(sdConfigFiles, false, false, logger)
@@ -114,7 +114,7 @@ outerLoop:
 	}
 	results := []sdCheckResult{}
 	for _, tgs := range sdCheckResults {
-		results = append(results, getSDCheckResult(tgs, scrapeConfig, noDefaultScrapePort)...)
+		results = append(results, getSDCheckResult(tgs, scrapeConfig)...)
 	}
 
 	res, err := json.MarshalIndent(results, "", "  ")
@@ -127,7 +127,7 @@ outerLoop:
 	return successExitCode
 }
 
-func getSDCheckResult(targetGroups []*targetgroup.Group, scrapeConfig *config.ScrapeConfig, noDefaultScrapePort bool) []sdCheckResult {
+func getSDCheckResult(targetGroups []*targetgroup.Group, scrapeConfig *config.ScrapeConfig) []sdCheckResult {
 	sdCheckResults := []sdCheckResult{}
 	lb := labels.NewBuilder(labels.EmptyLabels())
 	for _, targetGroup := range targetGroups {
@@ -144,7 +144,7 @@ func getSDCheckResult(targetGroups []*targetgroup.Group, scrapeConfig *config.Sc
 				}
 			}
 
-			res, orig, err := scrape.PopulateLabels(lb, scrapeConfig, noDefaultScrapePort)
+			res, orig, err := scrape.PopulateLabels(lb, scrapeConfig)
 			result := sdCheckResult{
 				DiscoveredLabels: orig,
 				Labels:           res,

cmd/promtool/sd_test.go

@@ -70,5 +70,5 @@ func TestSDCheckResult(t *testing.T) {
 		},
 	}
 
-	testutil.RequireEqual(t, expectedSDCheckResult, getSDCheckResult(targetGroups, scrapeConfig, true))
+	testutil.RequireEqual(t, expectedSDCheckResult, getSDCheckResult(targetGroups, scrapeConfig))
 }

docs/command-line/prometheus.md

@@ -56,7 +56,7 @@ The Prometheus monitoring server
 | <code class="text-nowrap">--query.timeout</code> | Maximum time a query may take before being aborted. Use with server mode only. | `2m` |
 | <code class="text-nowrap">--query.max-concurrency</code> | Maximum number of queries executed concurrently. Use with server mode only. | `20` |
 | <code class="text-nowrap">--query.max-samples</code> | Maximum number of samples a single query can load into memory. Note that queries will fail if they try to load more samples than this into memory, so this also limits the number of samples a query can return. Use with server mode only. | `50000000` |
-| <code class="text-nowrap">--enable-feature</code> <code class="text-nowrap">...<code class="text-nowrap"> | Comma separated feature names to enable. Valid options: auto-gomemlimit, exemplar-storage, expand-external-labels, memory-snapshot-on-shutdown, promql-per-step-stats, promql-experimental-functions, extra-scrape-metrics, auto-gomaxprocs, no-default-scrape-port, native-histograms, otlp-write-receiver, created-timestamp-zero-ingestion, concurrent-rule-eval, delayed-compaction, old-ui. See https://prometheus.io/docs/prometheus/latest/feature_flags/ for more details. |  |
+| <code class="text-nowrap">--enable-feature</code> <code class="text-nowrap">...<code class="text-nowrap"> | Comma separated feature names to enable. Valid options: auto-gomemlimit, exemplar-storage, expand-external-labels, memory-snapshot-on-shutdown, promql-per-step-stats, promql-experimental-functions, extra-scrape-metrics, auto-gomaxprocs, native-histograms, otlp-write-receiver, created-timestamp-zero-ingestion, concurrent-rule-eval, delayed-compaction, old-ui. See https://prometheus.io/docs/prometheus/latest/feature_flags/ for more details. |  |
 | <code class="text-nowrap">--agent</code> | Run Prometheus in 'Agent mode'. |  |
 | <code class="text-nowrap">--log.level</code> | Only log messages with the given severity or above. One of: [debug, info, warn, error] | `info` |
 | <code class="text-nowrap">--log.format</code> | Output format of log messages. One of: [logfmt, json] | `logfmt` |

docs/command-line/promtool.md

@@ -15,7 +15,7 @@ Tooling for the Prometheus monitoring system.
 | <code class="text-nowrap">-h</code>, <code class="text-nowrap">--help</code> | Show context-sensitive help (also try --help-long and --help-man). |
 | <code class="text-nowrap">--version</code> | Show application version. |
 | <code class="text-nowrap">--experimental</code> | Enable experimental commands. |
-| <code class="text-nowrap">--enable-feature</code> <code class="text-nowrap">...<code class="text-nowrap"> | Comma separated feature names to enable (only PromQL related and no-default-scrape-port). See https://prometheus.io/docs/prometheus/latest/feature_flags/ for the options and more details. |
+| <code class="text-nowrap">--enable-feature</code> <code class="text-nowrap">...<code class="text-nowrap"> | Comma separated feature names to enable. Currently unused. |
 
 
 

docs/feature_flags.md

@@ -71,15 +71,6 @@ When enabled, the GOMEMLIMIT variable is automatically set to match the Linux co
 
 There is also an additional tuning flag, `--auto-gomemlimit.ratio`, which allows controlling how much of the memory is used for Prometheus. The remainder is reserved for memory outside the process. For example, kernel page cache. Page cache is important for Prometheus TSDB query performance. The default is `0.9`, which means 90% of the memory limit will be used for Prometheus.
 
-## No default scrape port
-
-`--enable-feature=no-default-scrape-port`
-
-When enabled, the default ports for HTTP (`:80`) or HTTPS (`:443`) will _not_ be added to
-the address used to scrape a target (the value of the `__address_` label), contrary to the default behavior.
-In addition, if a default HTTP or HTTPS port has already been added either in a static configuration or
-by a service discovery mechanism and the respective scheme is specified (`http` or `https`), that port will be removed.
-
 ## Native Histograms
 
 `--enable-feature=native-histograms`

scrape/manager.go

@@ -70,8 +70,7 @@ func NewManager(o *Options, logger log.Logger, newScrapeFailureLogger func(strin
 
 // Options are the configuration parameters to the scrape manager.
 type Options struct {
-	ExtraMetrics  bool
-	NoDefaultPort bool
+	ExtraMetrics bool
 	// Option used by downstream scraper users like OpenTelemetry Collector
 	// to help lookup metric metadata. Should be false for Prometheus.
 	PassMetadataInContext bool

scrape/manager_test.go

@@ -52,12 +52,11 @@ func init() {
 
 func TestPopulateLabels(t *testing.T) {
 	cases := []struct {
-		in            labels.Labels
-		cfg           *config.ScrapeConfig
-		noDefaultPort bool
-		res           labels.Labels
-		resOrig       labels.Labels
-		err           string
+		in      labels.Labels
+		cfg     *config.ScrapeConfig
+		res     labels.Labels
+		resOrig labels.Labels
+		err     string
 	}{
 		// Regular population of scrape config options.
 		{
@@ -111,8 +110,8 @@ func TestPopulateLabels(t *testing.T) {
 				ScrapeTimeout:  model.Duration(time.Second),
 			},
 			res: labels.FromMap(map[string]string{
-				model.AddressLabel:        "1.2.3.4:80",
-				model.InstanceLabel:       "1.2.3.4:80",
+				model.AddressLabel:        "1.2.3.4",
+				model.InstanceLabel:       "1.2.3.4",
 				model.SchemeLabel:         "http",
 				model.MetricsPathLabel:    "/custom",
 				model.JobLabel:            "custom-job",
@@ -142,7 +141,7 @@ func TestPopulateLabels(t *testing.T) {
 				ScrapeTimeout:  model.Duration(time.Second),
 			},
 			res: labels.FromMap(map[string]string{
-				model.AddressLabel:        "[::1]:443",
+				model.AddressLabel:        "[::1]",
 				model.InstanceLabel:       "custom-instance",
 				model.SchemeLabel:         "https",
 				model.MetricsPathLabel:    "/metrics",
@@ -365,7 +364,6 @@ func TestPopulateLabels(t *testing.T) {
 				ScrapeInterval: model.Duration(time.Second),
 				ScrapeTimeout:  model.Duration(time.Second),
 			},
-			noDefaultPort: true,
 			res: labels.FromMap(map[string]string{
 				model.AddressLabel:        "1.2.3.4",
 				model.InstanceLabel:       "1.2.3.4",
@@ -384,7 +382,7 @@ func TestPopulateLabels(t *testing.T) {
 				model.ScrapeTimeoutLabel:  "1s",
 			}),
 		},
-		// Remove default port (http).
+		// verify that the default port is not removed (http).
 		{
 			in: labels.FromMap(map[string]string{
 				model.AddressLabel: "1.2.3.4:80",
@@ -396,9 +394,8 @@ func TestPopulateLabels(t *testing.T) {
 				ScrapeInterval: model.Duration(time.Second),
 				ScrapeTimeout:  model.Duration(time.Second),
 			},
-			noDefaultPort: true,
 			res: labels.FromMap(map[string]string{
-				model.AddressLabel:        "1.2.3.4",
+				model.AddressLabel:        "1.2.3.4:80",
 				model.InstanceLabel:       "1.2.3.4:80",
 				model.SchemeLabel:         "http",
 				model.MetricsPathLabel:    "/metrics",
@@ -415,7 +412,7 @@ func TestPopulateLabels(t *testing.T) {
 				model.ScrapeTimeoutLabel:  "1s",
 			}),
 		},
-		// Remove default port (https).
+		// verify that the default port is not removed (https).
 		{
 			in: labels.FromMap(map[string]string{
 				model.AddressLabel: "1.2.3.4:443",
@@ -427,9 +424,8 @@ func TestPopulateLabels(t *testing.T) {
 				ScrapeInterval: model.Duration(time.Second),
 				ScrapeTimeout:  model.Duration(time.Second),
 			},
-			noDefaultPort: true,
 			res: labels.FromMap(map[string]string{
-				model.AddressLabel:        "1.2.3.4",
+				model.AddressLabel:        "1.2.3.4:443",
 				model.InstanceLabel:       "1.2.3.4:443",
 				model.SchemeLabel:         "https",
 				model.MetricsPathLabel:    "/metrics",
@@ -450,7 +446,7 @@ func TestPopulateLabels(t *testing.T) {
 	for _, c := range cases {
 		in := c.in.Copy()
 
-		res, orig, err := PopulateLabels(labels.NewBuilder(c.in), c.cfg, c.noDefaultPort)
+		res, orig, err := PopulateLabels(labels.NewBuilder(c.in), c.cfg)
 		if c.err != "" {
 			require.EqualError(t, err, c.err)
 		} else {

scrape/scrape.go

@@ -87,8 +87,6 @@ type scrapePool struct {
 	// Constructor for new scrape loops. This is settable for testing convenience.
 	newLoop func(scrapeLoopOptions) loop
 
-	noDefaultPort bool
-
 	metrics *scrapeMetrics
 
 	scrapeFailureLogger    log.Logger
@@ -149,7 +147,6 @@ func newScrapePool(cfg *config.ScrapeConfig, app storage.Appendable, offsetSeed
 		logger:               logger,
 		metrics:              metrics,
 		httpOpts:             options.HTTPClientOptions,
-		noDefaultPort:        options.NoDefaultPort,
 	}
 	sp.newLoop = func(opts scrapeLoopOptions) loop {
 		// Update the targets retrieval function for metadata to a new scrape cache.
@@ -429,7 +426,7 @@ func (sp *scrapePool) Sync(tgs []*targetgroup.Group) {
 	sp.droppedTargets = []*Target{}
 	sp.droppedTargetsCount = 0
 	for _, tg := range tgs {
-		targets, failures := TargetsFromGroup(tg, sp.config, sp.noDefaultPort, targets, lb)
+		targets, failures := TargetsFromGroup(tg, sp.config, targets, lb)
 		for _, err := range failures {
 			level.Error(sp.logger).Log("msg", "Creating target failed", "err", err)
 		}

scrape/target.go

@@ -17,7 +17,6 @@ import (
 	"errors"
 	"fmt"
 	"hash/fnv"
-	"net"
 	"net/url"
 	"strings"
 	"sync"
@@ -424,7 +423,7 @@ func (app *maxSchemaAppender) AppendHistogram(ref storage.SeriesRef, lset labels
 // PopulateLabels builds a label set from the given label set and scrape configuration.
 // It returns a label set before relabeling was applied as the second return value.
 // Returns the original discovered label set found before relabelling was applied if the target is dropped during relabeling.
-func PopulateLabels(lb *labels.Builder, cfg *config.ScrapeConfig, noDefaultPort bool) (res, orig labels.Labels, err error) {
+func PopulateLabels(lb *labels.Builder, cfg *config.ScrapeConfig) (res, orig labels.Labels, err error) {
 	// Copy labels into the labelset for the target if they are not set already.
 	scrapeLabels := []labels.Label{
 		{Name: model.JobLabel, Value: cfg.JobName},
@@ -457,51 +456,7 @@ func PopulateLabels(lb *labels.Builder, cfg *config.ScrapeConfig, noDefaultPort
 		return labels.EmptyLabels(), labels.EmptyLabels(), errors.New("no address")
 	}
 
-	// addPort checks whether we should add a default port to the address.
-	// If the address is not valid, we don't append a port either.
-	addPort := func(s string) (string, string, bool) {
-		// If we can split, a port exists and we don't have to add one.
-		if host, port, err := net.SplitHostPort(s); err == nil {
-			return host, port, false
-		}
-		// If adding a port makes it valid, the previous error
-		// was not due to an invalid address and we can append a port.
-		_, _, err := net.SplitHostPort(s + ":1234")
-		return "", "", err == nil
-	}
-
 	addr := lb.Get(model.AddressLabel)
-	scheme := lb.Get(model.SchemeLabel)
-	host, port, add := addPort(addr)
-	// If it's an address with no trailing port, infer it based on the used scheme
-	// unless the no-default-scrape-port feature flag is present.
-	if !noDefaultPort && add {
-		// Addresses reaching this point are already wrapped in [] if necessary.
-		switch scheme {
-		case "http", "":
-			addr += ":80"
-		case "https":
-			addr += ":443"
-		default:
-			return labels.EmptyLabels(), labels.EmptyLabels(), fmt.Errorf("invalid scheme: %q", cfg.Scheme)
-		}
-		lb.Set(model.AddressLabel, addr)
-	}
-
-	if noDefaultPort {
-		// If it's an address with a trailing default port and the
-		// no-default-scrape-port flag is present, remove the port.
-		switch port {
-		case "80":
-			if scheme == "http" {
-				lb.Set(model.AddressLabel, host)
-			}
-		case "443":
-			if scheme == "https" {
-				lb.Set(model.AddressLabel, host)
-			}
-		}
-	}
 
 	if err := config.CheckTargetAddress(model.LabelValue(addr)); err != nil {
 		return labels.EmptyLabels(), labels.EmptyLabels(), err
@@ -557,7 +512,7 @@ func PopulateLabels(lb *labels.Builder, cfg *config.ScrapeConfig, noDefaultPort
 }
 
 // TargetsFromGroup builds targets based on the given TargetGroup and config.
-func TargetsFromGroup(tg *targetgroup.Group, cfg *config.ScrapeConfig, noDefaultPort bool, targets []*Target, lb *labels.Builder) ([]*Target, []error) {
+func TargetsFromGroup(tg *targetgroup.Group, cfg *config.ScrapeConfig, targets []*Target, lb *labels.Builder) ([]*Target, []error) {
 	targets = targets[:0]
 	failures := []error{}
 
@@ -573,7 +528,7 @@ func TargetsFromGroup(tg *targetgroup.Group, cfg *config.ScrapeConfig, noDefault
 			}
 		}
 
-		lset, origLabels, err := PopulateLabels(lb, cfg, noDefaultPort)
+		lset, origLabels, err := PopulateLabels(lb, cfg)
 		if err != nil {
 			failures = append(failures, fmt.Errorf("instance %d in group %s: %w", i, tg, err))
 		}

scrape/target_test.go

@@ -348,7 +348,7 @@ func TestTargetsFromGroup(t *testing.T) {
 		ScrapeInterval: model.Duration(1 * time.Minute),
 	}
 	lb := labels.NewBuilder(labels.EmptyLabels())
-	targets, failures := TargetsFromGroup(&targetgroup.Group{Targets: []model.LabelSet{{}, {model.AddressLabel: "localhost:9090"}}}, &cfg, false, nil, lb)
+	targets, failures := TargetsFromGroup(&targetgroup.Group{Targets: []model.LabelSet{{}, {model.AddressLabel: "localhost:9090"}}}, &cfg, nil, lb)
 	require.Len(t, targets, 1)
 	require.Len(t, failures, 1)
 	require.EqualError(t, failures[0], expectedError)
@@ -435,7 +435,7 @@ scrape_configs:
 			lb := labels.NewBuilder(labels.EmptyLabels())
 			group := &targetgroup.Group{Targets: targets}
 			for i := 0; i < b.N; i++ {
-				tgets, _ = TargetsFromGroup(group, config.ScrapeConfigs[0], false, tgets, lb)
+				tgets, _ = TargetsFromGroup(group, config.ScrapeConfigs[0], tgets, lb)
 				if len(targets) != nTargets {
 					b.Fatalf("Expected %d targets, got %d", nTargets, len(targets))
 				}