Hi,
a placeholder "Entity - unknown" is generated when an Alert is received for a non-existing CI.
This can happen during startup of a new connector, because Alerts a processed first - the CIs are coming in parallel and will resolve step by step.
The SNMP Connector has a problem with this though due to using cached information - CIs should always be generated first or as part of the Alert creation process.
The problem can also happen if there is a missmatch in the naming of the CIs, e.g. the triple MdrProduct, MdrProductInstance, MdrElementId identifying a CI does not match the given triple in an Alert. This is mainly due to policy errors or changes in the environment that are not reflected properly (removing and restarting a connector after major changes).
Which version of the UIM connector do you use?
You should open a Support Issue to get this clarified.
MichaelBoehm