support Prometheus /api/v1/status/buildinfo API

Signed-off-by: Ben Ye <[email protected]>

Author: yeya24

pkg/api/api.go

@@ -352,7 +352,7 @@ type Distributor interface {
 	UserStatsHandler(w http.ResponseWriter, r *http.Request)
 }
 
-// RegisterQueryable registers the the default routes associated with the querier
+// RegisterQueryable registers the default routes associated with the querier
 // module.
 func (a *API) RegisterQueryable(
 	queryable storage.SampleAndChunkQueryable,
@@ -374,6 +374,7 @@ func (a *API) RegisterQueryAPI(handler http.Handler) {
 	a.RegisterRoute(path.Join(a.cfg.PrometheusHTTPPrefix, "/api/v1/label/{name}/values"), handler, true, "GET")
 	a.RegisterRoute(path.Join(a.cfg.PrometheusHTTPPrefix, "/api/v1/series"), handler, true, "GET", "POST", "DELETE")
 	a.RegisterRoute(path.Join(a.cfg.PrometheusHTTPPrefix, "/api/v1/metadata"), handler, true, "GET")
+	a.RegisterRoute(path.Join(a.cfg.PrometheusHTTPPrefix, "/api/v1/status/buildinfo"), handler, true, "GET")
 
 	// Register Legacy Routers
 	a.RegisterRoute(path.Join(a.cfg.LegacyHTTPPrefix, "/api/v1/read"), handler, true, "POST")
@@ -384,6 +385,7 @@ func (a *API) RegisterQueryAPI(handler http.Handler) {
 	a.RegisterRoute(path.Join(a.cfg.LegacyHTTPPrefix, "/api/v1/label/{name}/values"), handler, true, "GET")
 	a.RegisterRoute(path.Join(a.cfg.LegacyHTTPPrefix, "/api/v1/series"), handler, true, "GET", "POST", "DELETE")
 	a.RegisterRoute(path.Join(a.cfg.LegacyHTTPPrefix, "/api/v1/metadata"), handler, true, "GET")
+	a.RegisterRoute(path.Join(a.cfg.LegacyHTTPPrefix, "/api/v1/status/buildinfo"), handler, true, "GET")
 }
 
 // RegisterQueryFrontend registers the Prometheus routes supported by the

pkg/api/handlers.go

@@ -15,6 +15,7 @@ import (
 	"github.com/prometheus/client_golang/prometheus/promauto"
 	dto "github.com/prometheus/client_model/go"
 	"github.com/prometheus/common/route"
+	"github.com/prometheus/common/version"
 	"github.com/prometheus/prometheus/config"
 	"github.com/prometheus/prometheus/storage"
 	v1 "github.com/prometheus/prometheus/web/api/v1"
@@ -194,7 +195,7 @@ func NewQuerierHandler(
 	api := v1.NewAPI(
 		engine,
 		querier.NewErrorTranslateSampleAndChunkQueryable(queryable), // Translate errors to errors expected by API.
-		nil, // No remote write support.
+		nil,                                                         // No remote write support.
 		exemplarQueryable,
 		func(context.Context) v1.TargetRetriever { return &querier.DummyTargetRetriever{} },
 		func(context.Context) v1.AlertmanagerRetriever { return &querier.DummyAlertmanagerRetriever{} },
@@ -211,7 +212,11 @@ func NewQuerierHandler(
 		false,
 		regexp.MustCompile(".*"),
 		func() (v1.RuntimeInfo, error) { return v1.RuntimeInfo{}, errors.New("not implemented") },
-		&v1.PrometheusVersion{},
+		&v1.PrometheusVersion{
+			Version:  version.Version,
+			Branch:   version.Branch,
+			Revision: version.Revision,
+		},
 		// This is used for the stats API which we should not support. Or find other ways to.
 		prometheus.GathererFunc(func() ([]*dto.MetricFamily, error) { return nil, nil }),
 		reg,
@@ -255,6 +260,7 @@ func NewQuerierHandler(
 	router.Path(path.Join(prefix, "/api/v1/label/{name}/values")).Methods("GET").Handler(promRouter)
 	router.Path(path.Join(prefix, "/api/v1/series")).Methods("GET", "POST", "DELETE").Handler(promRouter)
 	router.Path(path.Join(prefix, "/api/v1/metadata")).Methods("GET").Handler(promRouter)
+	router.Path(path.Join(prefix, "/api/v1/status/buildinfo")).Methods("GET").Handler(promRouter)
 
 	// TODO(gotjosh): This custom handler is temporary until we're able to vendor the changes in:
 	// https://github.com/prometheus/prometheus/pull/7125/files
@@ -268,6 +274,7 @@ func NewQuerierHandler(
 	router.Path(path.Join(legacyPrefix, "/api/v1/label/{name}/values")).Methods("GET").Handler(legacyPromRouter)
 	router.Path(path.Join(legacyPrefix, "/api/v1/series")).Methods("GET", "POST", "DELETE").Handler(legacyPromRouter)
 	router.Path(path.Join(legacyPrefix, "/api/v1/metadata")).Methods("GET").Handler(legacyPromRouter)
+	router.Path(path.Join(legacyPrefix, "/api/v1/status/buildinfo")).Methods("GET").Handler(legacyPromRouter)
 
 	// Track execution time.
 	return stats.NewWallTimeMiddleware().Wrap(router)