In the MCP 2019.2.13 maintenance update, Mirantis introduces the following enhancements for OpenStack:

To obtain the enhancements, follow the steps described in Apply maintenance updates.

RabbitMQ nonclustered configuration

Implemented the capability to set up a nonclustered active/backup RabbitMQ configuration instead of using the HA strategy. Mirantis recommends using such approach only to improve the stability and performance on large deployments if the clustered configuration causes issues. The feature is available for OpenStack Queens and starting from the RabbitMQ version 3.8.2.

Arbitrary Galera parameters

Implemented the capability to configure arbitrary Galera parameters using the wsrep_provider_options variable.