VMware Aria Operations 8.18.x
When an object that normally receives data from an adapter during a collection cycle does not receive data in the latest collection cycle, the Instance Generated|Number of No Data Receiving Objects metric for the adapter instance is changed. The alert is triggered against an adapter when the Number of No Data Receiving Objects metric is > 0 by default.
The following KBs identify some known issues that can cause the alert to falsely trigger for specific object types from specific adapter instances: