On a system without nrpe enabled, the following error is raised after applying a config change.
2015-04-24 11:18:53 DEBUG worker.uniter.jujuc server.go:103 hook context id "az1-compute/0:config-changed:1947388715018298365"; dir "/var/lib/juju/agents/unit-az1-compute-0/charm"
2015-04-24 11:18:53 INFO juju-log Check command not found: check_upstart_job
2015-04-24 11:18:53 INFO config-changed Traceback (most recent call last):
2015-04-24 11:18:53 INFO config-changed File "/var/lib/juju/agents/unit-az1-compute-0/charm/hooks/config-changed", line 328, in <module>
2015-04-24 11:18:53 INFO config-changed main()
2015-04-24 11:18:53 INFO config-changed File "/var/lib/juju/agents/unit-az1-compute-0/charm/hooks/config-changed", line 322, in main
2015-04-24 11:18:53 INFO config-changed hooks.execute(sys.argv)
2015-04-24 11:18:53 INFO config-changed File "/var/lib/juju/agents/unit-az1-compute-0/charm/hooks/charmhelpers/core/hookenv.py", line 544, in execute
2015-04-24 11:18:53 INFO config-changed self._hooks[hook_name]()
2015-04-24 11:18:53 INFO config-changed File "/var/lib/juju/agents/unit-az1-compute-0/charm/hooks/charmhelpers/core/host.py", line 312, in wrapped_f
2015-04-24 11:18:53 INFO config-changed f(*args)
2015-04-24 11:18:53 INFO config-changed File "/var/lib/juju/agents/unit-az1-compute-0/charm/hooks/config-changed", line 119, in config_changed
2015-04-24 11:18:53 INFO config-changed update_nrpe_config()
2015-04-24 11:18:53 INFO config-changed File "/var/lib/juju/agents/unit-az1-compute-0/charm/hooks/config-changed", line 317, in update_nrpe_config
2015-04-24 11:18:53 INFO config-changed nrpe_setup.write()
2015-04-24 11:18:53 INFO config-changed File "/var/lib/juju/agents/unit-az1-compute-0/charm/hooks/charmhelpers/contrib/charmsupport/nrpe.py", line 244, in write
2015-04-24 11:18:53 INFO config-changed self.nagios_servicegroups)
2015-04-24 11:18:53 INFO config-changed File "/var/lib/juju/agents/unit-az1-compute-0/charm/hooks/charmhelpers/contrib/charmsupport/nrpe.py", line 167, in write
2015-04-24 11:18:53 INFO config-changed with open(nrpe_check_file, 'w') as nrpe_check_config:
2015-04-24 11:18:53 INFO config-changed IOError: [Errno 2] No such file or directory: '/etc/nagios/nrpe.d/check_neutron-plugin-openvswitch-agent.cfg'
2015-04-24 11:18:53 ERROR juju.worker.uniter uniter.go:486 hook failed: exit status 1
2015-04-24 11:18:53 DEBUG juju.worker.uniter.filter filter.go:426 resolved event handled
2015-04-24 11:18:53 DEBUG juju.worker.uniter.filter filter.go:225 resolved clear completed
2015-04-24 11:18:55 DEBUG juju.worker.uniter.filter filter.go:317 got unit change
ftr i think this was not actually an issue on trunk as of yesterday since i tried upgrading without this patch and it seemed to work just fine. In any case a harmless patch.