add check if monitoring secret needs to be deleted

Author: Schmaetz

pkg/cluster/cluster.go

@@ -1168,6 +1168,12 @@ func (c *Cluster) Update(oldSpec, newSpec *cpov1.Postgresql) error {
 	if c.Spec.Monitoring != nil && newSpec.Spec.Monitoring != nil && oldSpec.Spec.Monitoring == nil {
 		c.addMonitoringPermissions()
 	}
+	// Check if Monitoring-Secret needs to be removed
+	if c.Spec.Monitoring != nil && newSpec.Spec.Monitoring == nil && oldSpec.Spec.Monitoring != nil {
+		if err := c.deleteMonitoringSecret(); err != nil {
+			return fmt.Errorf("could not remove the Monitoring secret: %v", err)
+		}
+	}
 
 	// streams
 	if len(newSpec.Spec.Streams) > 0 {