feat(metrics) Limit Cardinality of CSV metrics

This commit introduces a change that limits the number of metrics that
an OLM cluster reports at any given time for a CSV.

The first metric introduced is called csv_up, which tracks CSVs that
have reached the succeeded phase. The following information is
provided about the CSV via labels: name, version. The value of this
metric will always be 0 or 1.

The second metric introduced is called csv_abnormal, which is reported
whenever the CSV is updated and has not reached the succeeded phase. The
following information is provided about the CSV via labels: name,
version, phase, reason. Whenever a CSV is updated, the existing
timeseries is deleted and replaced by an updated version.

pkg/controller/operators/olm/operator.go

@@ -930,8 +930,6 @@ func (a *Operator) syncClusterServiceVersion(obj interface{}) (syncError error)
 	})
 	logger.Debug("syncing CSV")
 
-	metrics.EmitCSVMetric(clusterServiceVersion)
-
 	if a.csvNotification != nil {
 		a.csvNotification.OnAddOrUpdate(clusterServiceVersion)
 	}
@@ -964,6 +962,8 @@ func (a *Operator) syncClusterServiceVersion(obj interface{}) (syncError error)
 			} else {
 				syncError = fmt.Errorf("error transitioning ClusterServiceVersion: %s and error updating CSV status: %s", syncError, updateErr)
 			}
+		} else {
+			metrics.EmitCSVMetric(clusterServiceVersion, outCSV)
 		}
 	}
 

pkg/metrics/metrics.go

@@ -5,17 +5,16 @@ import (
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/labels"
 
+	olmv1alpha1 "github.com/operator-framework/operator-lifecycle-manager/pkg/api/apis/operators/v1alpha1"
 	"github.com/operator-framework/operator-lifecycle-manager/pkg/api/client/clientset/versioned"
 	v1alpha1 "github.com/operator-framework/operator-lifecycle-manager/pkg/api/client/listers/operators/v1alpha1"
-	olmv1alpha1 "github.com/operator-framework/operator-lifecycle-manager/pkg/api/apis/operators/v1alpha1"
-
 )
 
 const (
 	NAME_LABEL      = "name"
 	INSTALLED_LABEL = "installed"
 	VERSION_LABEL   = "version"
-	PHASE_LABEL    = "phase"
+	PHASE_LABEL     = "phase"
 	REASON_LABEL    = "reason"
 )
 
@@ -151,18 +150,27 @@ var (
 		[]string{NAME_LABEL, INSTALLED_LABEL},
 	)
 
-	csvSyncCounter = prometheus.NewCounterVec(
-		prometheus.CounterOpts{
-			Name: "csv_sync_total",
-			Help: "Monotonic count of CSV syncs",
+	csvSucceeded = prometheus.NewGaugeVec(
+		prometheus.GaugeOpts{
+			Name: "csv_up",
+			Help: "Successful CSV Install",
+		},
+		[]string{NAME_LABEL, VERSION_LABEL},
+	)
+
+	csvAbnormal = prometheus.NewGaugeVec(
+		prometheus.GaugeOpts{
+			Name: "csv_abnormal",
+			Help: "The current state of a CSV not in the succeeded phase",
 		},
 		[]string{NAME_LABEL, VERSION_LABEL, PHASE_LABEL, REASON_LABEL},
 	)
 )
 
 func RegisterOLM() {
 	prometheus.MustRegister(csvCount)
-	prometheus.MustRegister(csvSyncCounter)
+	prometheus.MustRegister(csvSucceeded)
+	prometheus.MustRegister(csvAbnormal)
 	prometheus.MustRegister(CSVUpgradeCount)
 }
 
@@ -177,6 +185,17 @@ func CounterForSubscription(name, installedCSV string) prometheus.Counter {
 	return SubscriptionSyncCount.WithLabelValues(name, installedCSV)
 }
 
-func EmitCSVMetric(csv *olmv1alpha1.ClusterServiceVersion){
-	csvSyncCounter.WithLabelValues(csv.Name, csv.Spec.Version.String(), string(csv.Status.Phase), string(csv.Status.Reason)).Inc()
+func EmitCSVMetric(oldCSV *olmv1alpha1.ClusterServiceVersion, newCSV *olmv1alpha1.ClusterServiceVersion) {
+	// Delete the old CSV metrics
+	csvAbnormal.DeleteLabelValues(oldCSV.Name, oldCSV.Spec.Version.String(), string(oldCSV.Status.Phase), string(oldCSV.Status.Reason))
+
+	// Get the phase of the new CSV
+	newCSVPhase := string(newCSV.Status.Phase)
+	csvSucceededGauge := csvSucceeded.WithLabelValues(newCSV.Name, newCSV.Spec.Version.String())
+	if newCSVPhase == string(olmv1alpha1.CSVPhaseSucceeded) {
+		csvSucceededGauge.Set(1)
+	} else {
+		csvSucceededGauge.Set(0)
+		csvAbnormal.WithLabelValues(newCSV.Name, newCSV.Spec.Version.String(), string(newCSV.Status.Phase), string(newCSV.Status.Reason)).Set(1)
+	}
 }