Changes to folder structure to allow multigroups and changed go mod name (#2105)

* Changed folder structure to allow multi group registration

* included actions.github.com directory for resources and controllers

* updated go module to actions/actions-runner-controller

* publish arc packages under actions-runner-controller

* Update charts/actions-runner-controller/docs/UPGRADING.md

Co-authored-by: Yusuke Kuoka <ykuoka@gmail.com>

controllers/actions.summerwind.net/metrics/runnerset.go

@@ -0,0 +1,31 @@
+package metrics
+
+import (
+	"github.com/actions/actions-runner-controller/apis/actions.summerwind.net/v1alpha1"
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+const (
+	rsName      = "runnerset"
+	rsNamespace = "namespace"
+)
+
+var (
+	runnerSetReplicas = prometheus.NewGaugeVec(
+		prometheus.GaugeOpts{
+			Name: "runnerset_spec_replicas",
+			Help: "replicas of RunnerSet",
+		},
+		[]string{rsName, rsNamespace},
+	)
+)
+
+func SetRunnerSet(rd v1alpha1.RunnerSet) {
+	labels := prometheus.Labels{
+		rsName:      rd.Name,
+		rsNamespace: rd.Namespace,
+	}
+	if rd.Spec.Replicas != nil {
+		runnerSetReplicas.With(labels).Set(float64(*rd.Spec.Replicas))
+	}
+}