@LeeFan
Usually ambari makes use of the following script to run the alert check for the ats-hbase service.
/var/lib/ambari-server/resources/stacks/HDP/3.0/services/YARN/package/alerts/alert_ats_hbase.py (on Ambari Server)
/var/lib/ambari-agent/cache/stacks/HDP/3.0/services/YARN/package/alerts/alert_ats_hbase.py
(On Agent hosts)
Above script relies on the following command to fetch the status.
# su - yarn-ats -c "/usr/hdp/current/hadoop-yarn-client/bin/yarn app -status ats-hbase"
However, in your attached screenshot where we see the alert .. shows the alert was executed 13 hours old alert. It might not be the current status of your ats-hbase.
So can you please try to disable the alert and then enable it after 10 seconds to see if the old alert clears.
Ambari UI --> Alerts (from left bottom panel) --> filter (icon) --> "Alert Definition Name" as "ATSv2 HBase Application" (click on Disable alertand then after 10 seconds to clear the old alert and then enable it back)
