Comment 2 for bug 1626473

[root@overcloud-controller-0 ~]# tail -f /var/log/gnocchi/metricd.log
2016-09-22 10:23:58.415 8902 ERROR cotyledon File "/usr/lib/python2.7/site-packages/cotyledon/__init__.py", line 53, in _logged_sys_exit
2016-09-22 10:23:58.415 8902 ERROR cotyledon atexit._run_exitfuncs()
2016-09-22 10:23:58.415 8902 ERROR cotyledon File "/usr/lib64/python2.7/atexit.py", line 24, in _run_exitfuncs
2016-09-22 10:23:58.415 8902 ERROR cotyledon func(*targs, **kargs)
2016-09-22 10:23:58.415 8902 ERROR cotyledon File "/usr/lib64/python2.7/multiprocessing/util.py", line 319, in _exit_function
2016-09-22 10:23:58.415 8902 ERROR cotyledon p.join()
2016-09-22 10:23:58.415 8902 ERROR cotyledon File "/usr/lib64/python2.7/multiprocessing/process.py", line 143, in join
2016-09-22 10:23:58.415 8902 ERROR cotyledon assert self._parent_pid == os.getpid(), 'can only join a child process'
2016-09-22 10:23:58.415 8902 ERROR cotyledon AssertionError: can only join a child process
2016-09-22 10:23:58.415 8902 ERROR cotyledon

possibly related, seems metricsd is stuck doing this - perhaps I need an updated overcloud image?