Autogrow metrics addition to orchestrator_core

Author: shashank-netapp

core/metrics/metrics.go

@@ -94,4 +94,19 @@ var (
 		},
 		[]string{"operation", "success"},
 	)
+	AutogrowPolicyGauge = promauto.NewGauge(
+		prometheus.GaugeOpts{
+			Namespace: config.OrchestratorName,
+			Name:      "autogrow_policy_count",
+			Help:      "The total number of Autogrow policies",
+		},
+	)
+	AutogrowVolumes = promauto.NewGaugeVec(
+		prometheus.GaugeOpts{
+			Namespace: config.OrchestratorName,
+			Name:      "autogrow_volume_count",
+			Help:      "The total number of volumes on which Autogrow is enabled",
+		},
+		[]string{"autogrow_policy", "storage_class"},
+	)
 )

core/orchestrator_core.go

@@ -772,6 +772,32 @@ func (o *TridentOrchestrator) updateMetrics() {
 			}
 		}
 	}
+
+	metrics.AutogrowPolicyGauge.Set(float64(len(o.autogrowPolicies)))
+
+	metrics.AutogrowVolumes.Reset()
+	for _, volume := range o.volumes {
+		if volume == nil {
+			continue
+		}
+		if volume.EffectiveAGPolicy.PolicyName != "" {
+			metrics.AutogrowVolumes.WithLabelValues(
+				volume.EffectiveAGPolicy.PolicyName,
+				volume.Config.StorageClass,
+			).Inc()
+		}
+	}
+	for _, volume := range o.subordinateVolumes {
+		if volume == nil {
+			continue
+		}
+		if volume.EffectiveAGPolicy.PolicyName != "" {
+			metrics.AutogrowVolumes.WithLabelValues(
+				volume.EffectiveAGPolicy.PolicyName,
+				volume.Config.StorageClass,
+			).Inc()
+		}
+	}
 }
 
 func (o *TridentOrchestrator) handleFailedTransaction(ctx context.Context, v *storage.VolumeTransaction) error {