CAUSE 1
Java (JVM) Heap allocation is not sufficient to support FglAM and agent operation. As a result, the DBSS agent(s) are not able to upgrade and are unable to connect to the instance due to driver mismatch.
CAUSE 2
Agent Manager is down, decommissioned or inaccessible while trying to Validate a DB agent connection.
RESOLUTION 1
1. Increase the JVM heap per the Cartridge Hardware Sizing document recommendation
Example: Foglight DBSS Hardware Sizing/Tuning Guide
2. Restart the Foglight Agent Manager
3. Run the DBSS Installer wizar and configure monitoring agents to upgrade and operate normally.
RESOLUTION 2
Reinstall the the Agent Manager if required, and delete and redeploy the DB agent(possibly to another existing FglAM).
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