Problem: I was able to successfully register an aggregator entry with mds-servicegroup-add, but the aggregator isn't collecting data for the registration.

Solution: The fact that the registration was successful does not mean that there are no errors in the registration parameters. Verify that details such as resource EPRs, resource property names, and queries are accurate, and check the container logs for the aggregator service and (if applicable) the remote service for more information.

Problem: I was able to successfully register an aggregator entry with mds-servicegroup-add, and the aggregator collected information for this entry for a while, but then the entry disappeared.

Solution: make sure thatmds-servicegroup-add is still running. Registrations time out; mds-servicegroup-add refreshes them periodically.