An alert "MQ Service is not running" is generated at infrequent intervals, even though the service is active.
When adding a new user to the admin portal the error "Email ID already in use" will appear.
When starting the apache web service the error "System Exception: service failed to start within a reasonable time: Apache 2.4" will appear.
After removing a tenant, you have to remove tenant databases in MongoDB manually.
Search functionality is no more working / Solr indexing has stopped