diff --git a/magnum/conf/drivers.py b/magnum/conf/drivers.py
index e4e32d91ea..2006c97f58 100644
--- a/magnum/conf/drivers.py
+++ b/magnum/conf/drivers.py
@@ -31,7 +31,10 @@ drivers_opts = [
                help='Path to the OpenStack CA-bundle file to pass and '
                     'install in all cluster nodes.'),
     cfg.BoolOpt('send_cluster_metrics',
-                default=True,
+                default=False,
+                deprecated_for_removal=True,
+                deprecated_reason='It does not make sense only collecting '
+                                  'metrics from the "default" namespcae.',
                 help='Allow periodic tasks to pull COE data and send to '
                      'ceilometer.'),
     cfg.ListOpt('disabled_drivers',
diff --git a/magnum/service/periodic.py b/magnum/service/periodic.py
index 2191d02593..5e66c77598 100755
--- a/magnum/service/periodic.py
+++ b/magnum/service/periodic.py
@@ -16,6 +16,7 @@
 import functools
 
 from oslo_log import log
+from oslo_log.versionutils import deprecated
 from oslo_service import loopingcall
 from oslo_service import periodic_task
 
@@ -140,6 +141,7 @@ class MagnumPeriodicTasks(periodic_task.PeriodicTasks):
 
     @periodic_task.periodic_task(run_immediately=True)
     @set_context
+    @deprecated(as_of=deprecated.ROCKY)
     def _send_cluster_metrics(self, ctx):
         if not CONF.drivers.send_cluster_metrics:
             LOG.debug('Skip sending cluster metrics')
diff --git a/magnum/tests/unit/service/test_periodic.py b/magnum/tests/unit/service/test_periodic.py
index 416305d8c5..4d50765a33 100644
--- a/magnum/tests/unit/service/test_periodic.py
+++ b/magnum/tests/unit/service/test_periodic.py
@@ -224,6 +224,7 @@ class PeriodicTestCase(base.TestCase):
                                   mock_get_notifier, mock_cluster_list,
                                   mock_create_monitor):
         """Test if RPC notifier receives the expected message"""
+        CONF.set_override('send_cluster_metrics', True, group='drivers')
         mock_make_admin_context.return_value = self.context
         notifier = mock.MagicMock()
         mock_get_notifier.return_value = notifier
@@ -269,6 +270,7 @@ class PeriodicTestCase(base.TestCase):
     def test_send_cluster_metrics_compute_metric_raise(
             self, mock_make_admin_context, mock_get_notifier,
             mock_cluster_list, mock_create_monitor):
+        CONF.set_override('send_cluster_metrics', True, group='drivers')
         mock_make_admin_context.return_value = self.context
         notifier = mock.MagicMock()
         mock_get_notifier.return_value = notifier
@@ -300,6 +302,7 @@ class PeriodicTestCase(base.TestCase):
     def test_send_cluster_metrics_pull_data_raise(
             self, mock_make_admin_context, mock_get_notifier,
             mock_cluster_list, mock_create_monitor):
+        CONF.set_override('send_cluster_metrics', True, group='drivers')
         mock_make_admin_context.return_value = self.context
         notifier = mock.MagicMock()
         mock_get_notifier.return_value = notifier
@@ -321,6 +324,7 @@ class PeriodicTestCase(base.TestCase):
     def test_send_cluster_metrics_monitor_none(
             self, mock_make_admin_context, mock_get_notifier,
             mock_cluster_list, mock_create_monitor):
+        CONF.set_override('send_cluster_metrics', True, group='drivers')
         mock_make_admin_context.return_value = self.context
         notifier = mock.MagicMock()
         mock_get_notifier.return_value = notifier
@@ -340,6 +344,7 @@ class PeriodicTestCase(base.TestCase):
     def test_send_cluster_metrics_disable_pull_data(
             self, mock_make_admin_context, mock_get_notifier,
             mock_cluster_list, mock_create_monitor):
+
         mock_make_admin_context.return_value = self.context
         notifier = mock.MagicMock()
         mock_get_notifier.return_value = notifier
@@ -352,9 +357,6 @@ class PeriodicTestCase(base.TestCase):
         monitor.get_metric_unit.return_value = '%'
         mock_create_monitor.return_value = monitor
 
-        CONF.set_override('send_cluster_metrics',
-                          False, group='drivers')
-
         periodic.MagnumPeriodicTasks(CONF)._send_cluster_metrics(self.context)
 
         self.assertEqual(0, mock_create_monitor.call_count)
diff --git a/releasenotes/notes/deprecate-send_cluster_metrics-8adaac64a979f720.yaml b/releasenotes/notes/deprecate-send_cluster_metrics-8adaac64a979f720.yaml
new file mode 100644
index 0000000000..247b9f4b15
--- /dev/null
+++ b/releasenotes/notes/deprecate-send_cluster_metrics-8adaac64a979f720.yaml
@@ -0,0 +1,14 @@
+---
+deprecations:
+  - |
+    Currently, Magnum is running periodic tasks to collect k8s cluster
+    metrics to message bus. Unfortunately, it's collecting pods info
+    only from "default" namespace which makes this function useless.
+    What's more, even Magnum can get all pods from all namespaces, it
+    doesn't make much sense to keep this function in Magnum. Because
+    operators only care about the health of cluster nodes. If they
+    want to know the status of pods, they can use heapster or other
+    tools to get that. So the feauture is being deprecated now and will be
+    removed in Stein release. And the default value is changed to False, which
+    means won't send the metrics.
+