You might encounter some excessive logging in your portal related to Liferay Monitoring:
ERROR [liferay/monitoring-982][ParallelDestination:59] Unable to process message {destinationName=liferay/monitoring, response=null, responseDestinationName=null, responseId=null, payload=[...]
Environment
Liferay DXP 7.0+
Resolution
You have a few options to handle this case:
If the root cause is unclear, you can request a debug patch from support to have more details
If you know that this monitoring feature is not even used, then you can simply disable it under Control Panel > System Settings > Infrastructure > Monitoring
