monitoring: increasing metrics scraping interval from 5s to 10s

let's increase the monitoring interval to match the default interval
used by Prometheus when deployed by Ceph: 10s

Closes: https://github.com/rook/rook/issues/13883

Signed-off-by: Redouane Kachach <rkachach@redhat.com>

pkg/operator/k8sutil/prometheus.go

@@ -63,7 +63,7 @@ func GetServiceMonitor(name string, namespace string, portName string) *monitori
 				{
 					Port:     portName,
 					Path:     "/metrics",
-					Interval: "5s",
+					Interval: "10s",
 				},
 			},
 		},

pkg/operator/k8sutil/prometheus_test.go

@@ -27,7 +27,7 @@ func TestGetServiceMonitor(t *testing.T) {
 	name := "rook-ceph-mgr"
 	namespace := "rook-ceph"
 	port := "http-metrics"
-	interval := monitoringv1.Duration("5s")
+	interval := monitoringv1.Duration("10s")
 	servicemonitor := GetServiceMonitor(name, namespace, port)
 	assert.Equal(t, name, servicemonitor.GetName())
 	assert.Equal(t, namespace, servicemonitor.GetNamespace())