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Why Ambari Metrics widgets display "N/A" or "No data available"?

Why Ambari Metrics widgets display "N/A" or "No data available"?

Hi all,

I installed an HDP 2.6 cluster, all service are up and running but Ambari Dashboard doesn't display data in widgets reporting "N/A" or "No data available".

From logs I can see that communication between collector and monitors is available.

During another installation I remember that I configured some custom groups properties to solve the same problem, but I don't remember and I can't find the properties to set.

Some suggestions?

Thanks!