The Synchronization between Performance Management and the Data Aggregator Data Sources fails.
The Device Manager DMService.log file shows an error referencing DS_PRODUCT_ID_CHANGED.
This is seen after having reinstalled the Data Aggregator without having deleted and re-added the Data Aggregator as a Data Source in Performance Management.
All supported Performance Management releases
Data Aggregator was removed and added again to Performance Management or Data Aggregator was re-installed.
If after resolving this issue you start getting error 503 attempting to use odata you may need to cycle Portal services: