fix: Skip replication slot reconciliation if fenced (cloudnative-pg#2816)

skip the replication slot reconciliation if the instance is fenced

closes cloudnative-pg#2784

Signed-off-by: YanniHu1996 <yantian.hu@enterprisedb.com>
Signed-off-by: Armando Ruocco <armando.ruocco@enterprisedb.com>
Signed-off-by: Tao Li <tao.li@enterprisedb.com>
Co-authored-by: Armando Ruocco <armando.ruocco@enterprisedb.com>
Co-authored-by: Tao Li <tao.li@enterprisedb.com>

Author: 3 people

internal/management/controller/slots/runner/runner.go

@@ -98,6 +98,13 @@ func (sr *Replicator) reconcile(ctx context.Context, config *apiv1.ReplicationSl
 		}
 	}()
 
+	contextLog := log.FromContext(ctx)
+
+	if sr.instance.IsFenced() {
+		contextLog.Trace("Replication slots reconciliation skipped: instance is fenced.")
+		return nil
+	}
+
 	primaryPool := sr.instance.PrimaryConnectionPool()
 	localPool := sr.instance.ConnectionPool()
 	err = synchronizeReplicationSlots(