At other times, especially on a new install you may receive this error in the Collector Log
2016-01-25 15:33:31,195 WARN
Unable to connect to HBase store using Phoenix.
org.apache.phoenix.schema.TableNotFoundException: ERROR 1012 (42M03): Table undefined. tableName=SYSTEM.CATALOG.
This is usually due to AMS Data being corrupt.
Shut down Ambari Monitors, and Collector via Ambari
Cleared out the /var/lib/ambari-metrics-collector dir for fresh restart
From Ambari -> Ambari Metrics -> Config -> Advanced ams-hbase-site get the hbase.rootdir and hbase-tmp directory
Delete or Move the hbase-tmp and hbase.rootdir directories to an archive folder
All services will came online and graphs started to display, after a few minutes