openstack-ansible/releasenotes/notes/use-galera-storage-d1a51c05...

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---
upgrade:
- The Aodh data migration script should be run to
migrate alarm data from MongoDB storage to Galera
due to the pending removal of MongoDB support.
fixes:
- Aodh has deprecated support for NoSQL storage (MongoDB
and Cassandra) in Mitaka with removal scheduled for
the O* release. This causes warnings in the logs. The
default of using MongoDB storage for Aodh is replaced
with the use of Galera. Continued use of MongoDB will
require the use of vars to specify a correct
``aodh_connection_string`` and add pymongo to the
``aodh_pip_packages`` list.