Add external API calls metric.

Signed-off-by: Cem Mergenci <[email protected]>

pkg/metrics/metrics.go

@@ -44,6 +44,13 @@ var (
 		Buckets:   []float64{1, 5, 10, 15, 30, 60, 120, 300, 600, 1800, 3600},
 	}, []string{"operation"})
 
+	ExternalAPICalls = prometheus.NewCounterVec(prometheus.CounterOpts{
+		Namespace: promNSUpjet,
+		Subsystem: promSysResource,
+		Name:      "external_api_calls",
+		Help:      "The number of external API calls.",
+	}, []string{"service", "service_operation"})
+
 	// DeletionTime is the histogram metric for collecting statistics on the
 	// intervals between the deletion timestamp and the moment when
 	// the resource is observed to be missing (actually deleted).
@@ -174,5 +181,5 @@ func (r *MetricRecorder) Start(ctx context.Context) error {
 }
 
 func init() {
-	metrics.Registry.MustRegister(CLITime, CLIExecutions, TFProcesses, TTRMeasurements, ExternalAPITime, DeletionTime, ReconcileDelay)
+	metrics.Registry.MustRegister(CLITime, CLIExecutions, TFProcesses, TTRMeasurements, ExternalAPITime, ExternalAPICalls, DeletionTime, ReconcileDelay)
 }