Trying see the Oldest Message Age Metrics for some of Queues
Setting the parameter at Queue Manager Level by configuring the Online Monitoring=Medium
With this parameter enabled, we are able to see the Oldest Message Blame Point Metrics. The problem is when changing the parameter to medium, it would revert back after 5 minutes. It almost looked like APM is resetting it after the 5 minute run.
An MQ environment/configuration issue.
APM Monitoring does not impact MQ settings. So the root cause lies elsewhere in the MQ environment