Just after the midnight all the errors and traces that our agents reported to enterprise manager disappears and can't see anymore in workstation.
Regardless of the number of metrics that could be erased automatically
Why data and traces of the previous day are not displayed?
Something inside the traces folder was corrupted the data or the index of the DB
The solution is rename or delete the traces folder and let the EM create it again from the scratch
In our case it happens to us after the migration of the EM from 9.1.1 to 9.5.1
Before deleting the traces/event db, try reindexing first. In most cases, this fixes the problem.
CA APM Installation and Upgrade Guide
This has happened to me. Depending on the APM version you are using, the introscope.enterprisemanager.transactionevents.storage.max.disk.usage clamp value in the apm-events-thresholds-config.xml file may need to be adjusted from megabytes to bytes (so a value of 1024000000 would be 1024 megabytes, or 10 gigabytes). I believe this typically occurs upon upgrading to 9.1.0 or higher. There used to be a similar property in the IntroscopeEnterpriseManager.properties file, but it should no longer be present (remove it if it is).