Drop sharding-exporter, move metrics to sharder (#638)

* Drop sharding-exporter

* Move `sharder` monitoring manifests one level up

* Update monitoring docs

* Move `metrics` package one level up

* Add generic exporter for object state

* Add shard state exporter

* Add ControllerRing state exporter

* Adapt sharding dashboard

* Switch webhosting-operator to generic exporter

* Drop kube-state-metrics renovate config

Author: timebertt

.github/renovate.json5

@@ -275,12 +275,6 @@
       ],
       changelogUrl: 'https://github.com/kubernetes-sigs/prometheus-adapter',
     },
-    {
-      matchPackageNames: [
-        'registry.k8s.io/kube-state-metrics/kube-state-metrics',
-      ],
-      changelogUrl: 'https://github.com/kubernetes/kube-state-metrics',
-    },
     {
       matchPackageNames: [
         'quay.io/brancz/kube-rbac-proxy',

cmd/sharder/app/app.go

@@ -32,6 +32,7 @@ import (
 	"sigs.k8s.io/controller-runtime/pkg/manager"
 
 	"github.com/timebertt/kubernetes-controller-sharding/pkg/controller"
+	shardingmetrics "github.com/timebertt/kubernetes-controller-sharding/pkg/metrics"
 	healthzutils "github.com/timebertt/kubernetes-controller-sharding/pkg/utils/healthz"
 	"github.com/timebertt/kubernetes-controller-sharding/pkg/webhook"
 )
@@ -104,6 +105,11 @@ func run(ctx context.Context, log logr.Logger, opts *options) error {
 		return fmt.Errorf("failed adding webhooks to manager: %w", err)
 	}
 
+	log.Info("Adding metrics to manager")
+	if err = shardingmetrics.AddToManager(mgr); err != nil {
+		return fmt.Errorf("failed adding metrics to manager: %w", err)
+	}
+
 	log.Info("Starting manager")
 	return mgr.Start(ctx)
 }

config/monitoring/kustomization.yaml

@@ -1,6 +1,10 @@
 apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
 
+namespace: sharding-system
+
 resources:
-- sharder
-- sharding-exporter
+- servicemonitor.yaml
+# provide prometheus running in namespace "monitoring" with the permissions required for service discovery in namespace
+# "sharding-system"
+- prometheus_rbac.yaml