feat(config): added config option to enable/disable autodiscovery (#69)

* feat(config): added config option to disable autodiscovery

* fix(variableName): enable_autodiscovery changed to disable_autodiscovery

cmd/nri-prometheus/config.go

@@ -76,6 +76,7 @@ func setViperDefaults(viper *viper.Viper) {
 	viper.SetDefault("auto_decorate", false)
 	viper.SetDefault("insecure_skip_verify", false)
 	viper.SetDefault("standalone", true)
+	viper.SetDefault("disable_autodiscovery", false)
 	viper.SetDefault("percentiles", []float64{50.0, 95.0, 99.0})
 }
 

deploy/local.yaml.example

@@ -93,6 +93,9 @@ data:
     insecure_skip_verify: false
     # The label used to identify scrapable targets. Defaults to "prometheus.io/scrape".
     scrape_enabled_label: "prometheus.io/scrape"
+    # Set to true in order to stop autodiscovery in the k8s cluster. It can be useful when running the Pod with a service account
+    # having limited privileges. Defaults to false.
+    # disable_autodiscovery: false
     # Wether k8s nodes needs to be labelled to be scraped or not. Defaults to false.
     require_scrape_enabled_label_for_nodes: true
     #targets:

deploy/nri-prometheus.tmpl.yaml

@@ -132,6 +132,10 @@ data:
     # If left empty, TLS uses the host's root CA set.
     # emitter_ca_file: "/path/to/cert/server.pem"
 
+    # Set to true in order to stop autodiscovery in the k8s cluster. It can be useful when running the Pod with a service account
+    # having limited privileges. Defaults to false.
+    # disable_autodiscovery: false
+
     # Whether the emitter should skip TLS verification when submitting data.
     # Defaults to false.
     # emitter_insecure_skip_verify: false

internal/cmd/scraper/scraper.go

@@ -33,6 +33,7 @@ type Config struct {
 	RequireScrapeEnabledLabelForNodes bool                         `mapstructure:"require_scrape_enabled_label_for_nodes"`
 	ScrapeTimeout                     time.Duration                `mapstructure:"scrape_timeout"`
 	Standalone                        bool                         `mapstructure:"standalone"`
+	DisableAutodiscovery              bool                         `mapstructure:"disable_autodiscovery"`
 	ScrapeDuration                    string                       `mapstructure:"scrape_duration"`
 	EmitterHarvestPeriod              string                       `mapstructure:"emitter_harvest_period"`
 	TargetConfigs                     []endpoints.TargetConfig     `mapstructure:"targets"`
@@ -119,11 +120,13 @@ func RunWithEmitters(cfg *Config, emitters []integration.Emitter) error {
 	}
 	retrievers = append(retrievers, fixedRetriever)
 
-	kubernetesRetriever, err := endpoints.NewKubernetesTargetRetriever(cfg.ScrapeEnabledLabel, cfg.RequireScrapeEnabledLabelForNodes, endpoints.WithInClusterConfig())
-	if err != nil {
-		logrus.WithError(err).Errorf("not possible to get a Kubernetes client. If you aren't running this integration in a Kubernetes cluster, you can ignore this error")
-	} else {
-		retrievers = append(retrievers, kubernetesRetriever)
+	if !cfg.DisableAutodiscovery {
+		kubernetesRetriever, err := endpoints.NewKubernetesTargetRetriever(cfg.ScrapeEnabledLabel, cfg.RequireScrapeEnabledLabelForNodes, endpoints.WithInClusterConfig())
+		if err != nil {
+			logrus.WithError(err).Errorf("not possible to get a Kubernetes client. If you aren't running this integration in a Kubernetes cluster, you can ignore this error")
+		} else {
+			retrievers = append(retrievers, kubernetesRetriever)
+		}
 	}
 	defaultTransformations := integration.ProcessingRule{
 		Description: "Default transformation rules",