Instrumentation: Adds environment_info metric (#28355)

Signed-off-by: bergquist <carl.bergquist@gmail.com>

Co-authored-by: Arve Knudsen <arve.knudsen@gmail.com>

conf/defaults.ini

@@ -670,6 +670,12 @@ disable_total_stats = false
 basic_auth_username =
 basic_auth_password =
 
+# Metrics environment info adds dimensions to the `grafana_environment_info` metric, which 
+# can expose more information about the Grafana instance.
+[metrics.environment_info]
+#exampleLabel1 = exampleValue1
+#exampleLabel2 = exampleValue2
+
 # Send internal Grafana metrics to graphite
 [metrics.graphite]
 # Enable by setting the address setting (ex localhost:2003)

conf/sample.ini

@@ -664,6 +664,12 @@
 ; basic_auth_username =
 ; basic_auth_password =
 
+# Metrics environment info adds dimensions to the `grafana_environment_info` metric, which 
+# can expose more information about the Grafana instance.
+[metrics.environment_info]
+#exampleLabel1 = exampleValue1
+#exampleLabel2 = exampleValue2
+
 # Send internal metrics to Graphite
 [metrics.graphite]
 # Enable by setting the address setting (ex localhost:2003)

docs/sources/administration/configuration.md

@@ -399,7 +399,7 @@ The length of time that Grafana will wait for a successful TLS handshake with th
 
 ### expect_continue_timeout_seconds
 
-The length of time that Grafana will wait for a datasource’s first response headers after fully writing the request headers, if the request has an “Expect: 100-continue” header.  A value of `0` will result in the body being sent immediately. Default is `1` second. For more details check the [Transport.ExpectContinueTimeout](https://golang.org/pkg/net/http/#Transport.ExpectContinueTimeout) documentation.
+The length of time that Grafana will wait for a datasource’s first response headers after fully writing the request headers, if the request has an “Expect: 100-continue” header. A value of `0` will result in the body being sent immediately. Default is `1` second. For more details check the [Transport.ExpectContinueTimeout](https://golang.org/pkg/net/http/#Transport.ExpectContinueTimeout) documentation.
 
 ### max_idle_connections
 
@@ -625,7 +625,7 @@ Default is `false`.
 
 ### user_invite_max_lifetime_duration
 
-The duration in time a user invitation remains valid before expiring. 
+The duration in time a user invitation remains valid before expiring.
 This setting should be expressed as a duration. Examples: 6h (hours), 2d (days), 1w (week).
 Default is `24h` (24 hours). The minimum supported duration is `15m` (15 minutes).
 
@@ -1075,6 +1075,15 @@ If both are set, then basic authentication is required to access the metrics end
 
 <hr>
 
+## [metrics.environment_info]
+
+Adds dimensions to the `grafana_environment_info` metric, which can expose more information about the Grafana instance.
+
+```
+; exampleLabel1 = exampleValue1
+; exampleLabel2 = exampleValue2
+```
+
 ## [metrics.graphite]
 
 Use these options if you want to send internal Grafana metrics to Graphite.

pkg/infra/metrics/metrics.go

@@ -513,6 +513,26 @@ func SetBuildInformation(version, revision, branch string) {
 	grafanaBuildVersion.WithLabelValues(version, revision, branch, runtime.Version(), edition).Set(1)
 }
 
+// SetEnvironmentInformation exposes environment values provided by the operators as an `_info` metric.
+// If there are no environment metrics labels configured, this metric will not be exposed.
+func SetEnvironmentInformation(labels map[string]string) error {
+	if len(labels) == 0 {
+		return nil
+	}
+
+	grafanaEnvironmentInfo := prometheus.NewGauge(prometheus.GaugeOpts{
+		Name:        "environment_info",
+		Help:        "A metric with a constant '1' value labeled by environment information about the running instance.",
+		Namespace:   ExporterName,
+		ConstLabels: labels,
+	})
+
+	prometheus.MustRegister(grafanaEnvironmentInfo)
+
+	grafanaEnvironmentInfo.Set(1)
+	return nil
+}
+
 func SetPluginBuildInformation(pluginID, pluginType, version string) {
 	grafanaPluginBuildInfoDesc.WithLabelValues(pluginID, pluginType, version).Set(1)
 }

pkg/server/server.go

@@ -22,6 +22,7 @@ import (
 	_ "github.com/grafana/grafana/pkg/extensions"
 	"github.com/grafana/grafana/pkg/infra/localcache"
 	"github.com/grafana/grafana/pkg/infra/log"
+	"github.com/grafana/grafana/pkg/infra/metrics"
 	_ "github.com/grafana/grafana/pkg/infra/metrics"
 	_ "github.com/grafana/grafana/pkg/infra/remotecache"
 	_ "github.com/grafana/grafana/pkg/infra/serverlock"
@@ -117,6 +118,9 @@ func (s *Server) init(cfg *Config) error {
 
 	s.loadConfiguration()
 	s.writePIDFile()
+	if err := metrics.SetEnvironmentInformation(s.cfg.MetricsGrafanaEnvironmentInfo); err != nil {
+		return err
+	}
 
 	login.Init()
 	social.NewOAuthService()

pkg/setting/setting.go

@@ -17,6 +17,7 @@ import (
 	"time"
 
 	"github.com/go-macaron/session"
+	"github.com/prometheus/common/model"
 	ini "gopkg.in/ini.v1"
 
 	"github.com/grafana/grafana/pkg/components/gtime"
@@ -267,17 +268,20 @@ type Cfg struct {
 	CookieSameSiteDisabled           bool
 	CookieSameSiteMode               http.SameSite
 
-	TempDataLifetime                 time.Duration
+	TempDataLifetime         time.Duration
+	PluginsEnableAlpha       bool
+	PluginsAppsSkipVerifyTLS bool
+	PluginSettings           PluginSettings
+	PluginsAllowUnsigned     []string
+	DisableSanitizeHtml      bool
+	EnterpriseLicensePath    string
+
+	// Metrics
 	MetricsEndpointEnabled           bool
 	MetricsEndpointBasicAuthUsername string
 	MetricsEndpointBasicAuthPassword string
 	MetricsEndpointDisableTotalStats bool
-	PluginsEnableAlpha               bool
+	MetricsGrafanaEnvironmentInfo    map[string]string
-	PluginsAppsSkipVerifyTLS         bool
-	PluginSettings                   PluginSettings
-	PluginsAllowUnsigned             []string
-	DisableSanitizeHtml              bool
-	EnterpriseLicensePath            string
 
 	// Dashboards
 	DefaultHomeDashboardPath string
@@ -411,6 +415,29 @@ func applyEnvVariableOverrides(file *ini.File) error {
 	return nil
 }
 
+func (cfg *Cfg) readGrafanaEnvironmentMetrics() error {
+	environmentMetricsSection := cfg.Raw.Section("metrics.environment_info")
+	keys := environmentMetricsSection.Keys()
+	cfg.MetricsGrafanaEnvironmentInfo = make(map[string]string, len(keys))
+
+	for _, key := range keys {
+		labelName := model.LabelName(key.Name())
+		labelValue := model.LabelValue(key.Value())
+
+		if !labelName.IsValid() {
+			return fmt.Errorf("invalid label name in [metrics.environment_info] configuration. name %q", labelName)
+		}
+
+		if !labelValue.IsValid() {
+			return fmt.Errorf("invalid label value in [metrics.environment_info] configuration. name %q value %q", labelName, labelValue)
+		}
+
+		cfg.MetricsGrafanaEnvironmentInfo[string(labelName)] = string(labelValue)
+	}
+
+	return nil
+}
+
 func (cfg *Cfg) readAnnotationSettings() {
 	dashboardAnnotation := cfg.Raw.Section("annotations.dashboard")
 	apiIAnnotation := cfg.Raw.Section("annotations.api")
@@ -781,6 +808,9 @@ func (cfg *Cfg) Load(args *CommandLineArgs) error {
 	cfg.readSmtpSettings()
 	cfg.readQuotaSettings()
 	cfg.readAnnotationSettings()
+	if err := cfg.readGrafanaEnvironmentMetrics(); err != nil {
+		return err
+	}
 
 	if VerifyEmailEnabled && !cfg.Smtp.Enabled {
 		log.Warnf("require_email_validation is enabled but smtp is disabled")