Device/Component shows "No Data Available" for polled metric. For example, the CPU components are discovered and polling without error, but views based on one or more polled metrics show "No Data Available".
Looking at Detailed Poll Logging from http://<da>:<port>/dcdebug shows the OIDs being polled and returning values, the "Poll response after delta processing" shows values, but the "Poll Response after data processing" shows NULL.
This indicates that Metric Filtering has been applied in the associated Monitoring Profile:
CA Performance Management
Unfilter the metrics you wish to collect.