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"No Data Available. The Ambari Metrics service may be not installed or inaccessible"

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"No Data Available. The Ambari Metrics service may be not installed or inaccessible"

New Contributor

This error message within some Ambari widget can probably be due to numerous issues. How would one go about and debug this? I am installing a HDP sandbox 2.6.5 on CentOS 7 and everything seems green but somehow the memory usage and cpu usage doesnt show in the ambari dashboard. The disk usage and many other widgets are showing values without any problem.