Comment 0 for bug 1399164

Description of the environment:
Ceilometer with mongodb as backend

Steps to reproduce:
run in production environment

Expected result:
* time_to_live is configured ( N seconds > 0 )
* ceilometer-expirer is enabled to wipe out outdated metrics from database

Actual result:
ceilometer-expirer is disabled

Workaround:
Set time_to_live option in ceilometer.conf
and activate cron periodic expirer task

Impact:
Ceilometer collects quite huge amounts of metrics which keep in the database forever