Hello Elodie,
an application that keeps state info on behalf of other applications. Normally concerns an item such as service availability.
That's overly simplified.
A typical scenario: trackedObjectManager might validate and hold state info for critical route destinations to help optimize routing decisions.
Clunky definitions aside, I'm not familiar with the error message you've reported and cant offer d guidance regarding cause or possible impact .
I recommend a call to the GTAC for further investigation.
And firmware upgrade - as conditions allow.
hope that helps
Mike