openstack-ansible/releasenotes/notes/db-pooling-7c42f3aed39d5fc9...

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upgrade:
- We have changed default values for variables related to database connection pooling. For some services(like nova) default pool sizes will be significantly lower, we have also decreased default connection_recycle_time to 10 minutes. It should not cause any issues, but we recommended to double check these values, especially for large environments.