diff --git a/ceilometer/publisher/gnocchi.py b/ceilometer/publisher/gnocchi.py
index 90e4a20710..45f32766f8 100644
--- a/ceilometer/publisher/gnocchi.py
+++ b/ceilometer/publisher/gnocchi.py
@@ -261,22 +261,31 @@ class GnocchiPublisher(publisher.ConfigPublisherBase):
             return self._gnocchi_project_id
         with self._gnocchi_project_id_lock:
             if self._gnocchi_project_id is None:
+                if not self.filter_project:
+                    LOG.debug(
+                        "Multiple executions were locked on "
+                        "self._gnocchi_project_id_lock`. This execution "
+                        "should no call `_internal_gnocchi_project_discovery` "
+                        "as `self.filter_project` is None.")
+                    return None
                 try:
                     project = self._ks_client.projects.find(
                         name=self.filter_project,
                         domain=self.filter_domain)
                 except ka_exceptions.NotFound:
-                    LOG.warning('project %s not found in keystone,'
-                                ' ignoring the filter_project '
-                                'option', self.filter_project)
+                    LOG.warning('Filtered project [%s] not found in keystone, '
+                                'ignoring the filter_project option' %
+                                self.filter_project)
+
                     self.filter_project = None
                     return None
                 except Exception:
-                    LOG.exception('fail to retrieve filtered project ')
+                    LOG.exception('Failed to retrieve filtered project [%s].'
+                                  % self.filter_project)
                     raise
                 self._gnocchi_project_id = project.id
-                LOG.debug("filtered project found: %s",
-                          self._gnocchi_project_id)
+                LOG.debug("Filtered project [%s] found with ID [%s].",
+                          self.filter_project, self._gnocchi_project_id)
             return self._gnocchi_project_id
 
     def _is_swift_account_sample(self, sample):
@@ -301,11 +310,29 @@ class GnocchiPublisher(publisher.ConfigPublisherBase):
             if operation:
                 return rd, operation
 
+    def filter_gnocchi_activity_openstack(self, samples):
+        """Skip sample generated by gnocchi itself
+
+        This method will filter out the samples that are generated by
+        Gnocchi itself.
+        """
+        filtered_samples = []
+        for sample in samples:
+            if not self._is_gnocchi_activity(sample):
+                filtered_samples.append(sample)
+                LOG.debug("Sample [%s] is not a Gnocchi activity; therefore, "
+                          "we do not filter it out and push it to Gnocchi.",
+                          sample)
+            else:
+                LOG.debug("Sample [%s] is a Gnocchi activity; therefore, "
+                          "we filter it out and do not push it to Gnocchi.",
+                          sample)
+        return filtered_samples
+
     def publish_samples(self, data):
         self.ensures_archives_policies()
 
-        # NOTE(sileht): skip sample generated by gnocchi itself
-        data = [s for s in data if not self._is_gnocchi_activity(s)]
+        data = self.filter_gnocchi_activity_openstack(data)
 
         def value_to_sort(object_to_sort):
             value = object_to_sort.resource_id
diff --git a/ceilometer/tests/unit/publisher/test_gnocchi.py b/ceilometer/tests/unit/publisher/test_gnocchi.py
index 741594d548..e8264f8521 100644
--- a/ceilometer/tests/unit/publisher/test_gnocchi.py
+++ b/ceilometer/tests/unit/publisher/test_gnocchi.py
@@ -339,9 +339,9 @@ class PublisherTest(base.BaseTestCase):
     def test_activity_gnocchi_project_not_found(self, logger):
         self.ks_client.projects.find.side_effect = ka_exceptions.NotFound
         self._do_test_activity_filter(2)
-        logger.warning.assert_called_with('project %s not found in '
-                                          'keystone, ignoring the '
-                                          'filter_project option', 'service')
+        logger.warning.assert_called_with(
+            'Filtered project [service] not found in keystone, ignoring the '
+            'filter_project option')
 
     def test_activity_filter_match_swift_event(self):
         self.samples[0].name = 'storage.objects.outgoing.bytes'
@@ -749,8 +749,11 @@ class PublisherWorkflowTest(base.BaseTestCase,
         resource_type = resource_definition.cfg['resource_type']
 
         expected_debug = [
-            mock.call('filtered project found: %s',
+            mock.call('Filtered project [%s] found with ID [%s].', 'service',
                       'a2d42c23-d518-46b6-96ab-3fba2e146859'),
+            mock.call('Sample [%s] is not a Gnocchi activity; therefore, we '
+                      'do not filter it out and push it to Gnocchi.',
+                      self.sample),
             mock.call('Processing sample [%s] for resource ID [%s].',
                       self.sample, resource_id),
             mock.call('Executing batch resource metrics measures for resource '