Administrator sees repeated SQL Server log messages of "the Service Broker endpoint is in disabled or stopped state" for the CM DB

This looks to be a SQL Server AOAG (Always On Availability Group) log message, not from the Tridion Sites application. From below forum thread, the log messages are expected until/unless an endpoint is created. Administrator should test creating an endpoint on Dev environment first before making changes to Production however, and this resolution has not been validated.
https://dba.stackexchange.com/questions/102692/the-service-broker-endpoint-is-in-disabled-or-stopped-state-aoag-sql-server