The pike ceilometer-charm does not install python-gnocchiclient this is causing the ceilometer.pipeline to raise exceptions:
2018-06-05 20:35:00.731 1357775 WARNING oslo_config.cfg [-] Option "meter_dispatchers" from group "DEFAULT" is deprecated for removal (This option only be used in collector service, the collector service has been deprecated and will be removed in the future, this should also be deprecated for removal with collector service.). Its value may be silently ignored in the future.
2018-06-05 20:35:00.812 1358212 INFO ceilometer.pipeline [-] Config file: {'sources': [{'meters': ['*'], 'name': 'meter_source', 'sinks': ['meter_sink']}, {'meters': ['cpu'], 'name': 'cpu_source', 'sinks': ['cpu_sink', 'cpu_delta_sink']}, {'meters': ['disk.read.bytes', 'disk.read.requests', 'disk.write.bytes', 'disk.write.requests', 'disk.device.read.bytes', 'disk.device.read.requests', 'disk.device.write.bytes', 'disk.device.write.requests'], 'name': 'disk_source', 'sinks': ['disk_sink']}, {'meters': ['network.incoming.bytes', 'network.incoming.packets', 'network.outgoing.bytes', 'network.outgoing.packets'], 'name': 'network_source', 'sinks': ['network_sink']}], 'sinks': [{'publishers': ['gnocchi://'], 'transformers': None, 'name': 'meter_sink'}, {'publishers': ['gnocchi://'], 'transformers': [{'name': 'rate_of_change', 'parameters': {'target': {'max': 100, 'scale': '100.0 / (10**9 * (resource_metadata.cpu_number or 1))', 'type': 'gauge', 'name': 'cpu_util', 'unit': '%'}}}], 'name': 'cpu_sink'}, {'publishers': ['gnocchi://'], 'transformers': [{'name': 'delta', 'parameters': {'target': {'name': 'cpu.delta'}, 'growth_only': True}}], 'name': 'cpu_delta_sink'}, {'publishers': ['gnocchi://'], 'transformers': [{'name': 'rate_of_change', 'parameters': {'source': {'map_from': {'name': '(disk\\.device|disk)\\.(read|write)\\.(bytes|requests)', 'unit': '(B|request)'}}, 'target': {'map_to': {'name': '\\1.\\2.\\3.rate', 'unit': '\\1/s'}, 'type': 'gauge'}}}], 'name': 'disk_sink'}, {'publishers': ['gnocchi://'], 'transformers': [{'name': 'rate_of_change', 'parameters': {'source': {'map_from': {'name': 'network\\.(incoming|outgoing)\\.(bytes|packets)', 'unit': '(B|packet)'}}, 'target': {'map_to': {'name': 'network.\\1.\\2.rate', 'unit': '\\1/s'}, 'type': 'gauge'}}}], 'name': 'network_sink'}]}
2018-06-05 20:35:00.813 1358212 INFO ceilometer.pipeline [-] detected decoupled pipeline config format
2018-06-05 20:35:00.822 1358212 ERROR ceilometer.pipeline [-] Unable to load publisher gnocchi://: ImportError: No module named gnocchiclient
2018-06-05 20:35:00.822 1358212 ERROR ceilometer.pipeline Traceback (most recent call last):
2018-06-05 20:35:00.822 1358212 ERROR ceilometer.pipeline File "/usr/lib/python2.7/dist-packages/ceilometer/pipeline.py", line 419, in __init__
2018-06-05 20:35:00.822 1358212 ERROR ceilometer.pipeline self.publishers.append(publisher_manager.get(p))
2018-06-05 20:35:00.822 1358212 ERROR ceilometer.pipeline File "/usr/lib/python2.7/dist-packages/ceilometer/pipeline.py", line 713, in get
2018-06-05 20:35:00.822 1358212 ERROR ceilometer.pipeline 'ceilometer.%s.publisher' % self._purpose)
2018-06-05 20:35:00.822 1358212 ERROR ceilometer.pipeline File "/usr/lib/python2.7/dist-packages/ceilometer/publisher/__init__.py", line 34, in get_publisher
2018-06-05 20:35:00.822 1358212 ERROR ceilometer.pipeline return loaded_driver.driver(conf, parse_result)
2018-06-05 20:35:00.822 1358212 ERROR ceilometer.pipeline File "/usr/lib/python2.7/dist-packages/ceilometer/publisher/direct.py", line 53, in __init__
2018-06-05 20:35:00.822 1358212 ERROR ceilometer.pipeline 'ceilometer.dispatcher.meter', self.dispatcher_name).driver
2018-06-05 20:35:00.822 1358212 ERROR ceilometer.pipeline File "/usr/lib/python2.7/dist-packages/stevedore/driver.py", line 61, in __init__
2018-06-05 20:35:00.822 1358212 ERROR ceilometer.pipeline warn_on_missing_entrypoint=warn_on_missing_entrypoint
2018-06-05 20:35:00.822 1358212 ERROR ceilometer.pipeline File "/usr/lib/python2.7/dist-packages/stevedore/named.py", line 81, in __init__
2018-06-05 20:35:00.822 1358212 ERROR ceilometer.pipeline verify_requirements)
2018-06-05 20:35:00.822 1358212 ERROR ceilometer.pipeline File "/usr/lib/python2.7/dist-packages/stevedore/extension.py", line 194, in _load_plugins
2018-06-05 20:35:00.822 1358212 ERROR ceilometer.pipeline self._on_load_failure_callback(self, ep, err)
2018-06-05 20:35:00.822 1358212 ERROR ceilometer.pipeline File "/usr/lib/python2.7/dist-packages/stevedore/extension.py", line 186, in _load_plugins
2018-06-05 20:35:00.822 1358212 ERROR ceilometer.pipeline verify_requirements,
2018-06-05 20:35:00.822 1358212 ERROR ceilometer.pipeline File "/usr/lib/python2.7/dist-packages/stevedore/named.py", line 158, in _load_one_plugin
2018-06-05 20:35:00.822 1358212 ERROR ceilometer.pipeline verify_requirements,
2018-06-05 20:35:00.822 1358212 ERROR ceilometer.pipeline File "/usr/lib/python2.7/dist-packages/stevedore/extension.py", line 214, in _load_one_plugin
2018-06-05 20:35:00.822 1358212 ERROR ceilometer.pipeline plugin = ep.resolve()
2018-06-05 20:35:00.822 1358212 ERROR ceilometer.pipeline File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 2322, in resolve
2018-06-05 20:35:00.822 1358212 ERROR ceilometer.pipeline module = __import__(self.module_name, fromlist=['__name__'], level=0)
2018-06-05 20:35:00.822 1358212 ERROR ceilometer.pipeline File "/usr/lib/python2.7/dist-packages/ceilometer/dispatcher/gnocchi.py", line 23, in <module>
2018-06-05 20:35:00.822 1358212 ERROR ceilometer.pipeline from gnocchiclient import exceptions as gnocchi_exc
2018-06-05 20:35:00.822 1358212 ERROR ceilometer.pipeline ImportError: No module named gnocchiclient
we are not sure if this is related but we are also seeing the event.sample queue fill up with messages that never get consumed.