The above was originally posted in the Community Help Track. On Tue Jun 4 03:36 UTC 2019, a member of the HCC moderation staff moved it to the Cloud & Operations track. The Community Help Track is intended for questions about using the HCC site itself.
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In addition to Geoffrey's comment, Can you also tail the "/var/log/ambari-server/ambari-server.log" and then try to hit the Ambari UI Alert page again and then see if it shows any WARNING / Error there?
When you hit the Alert page in Ambari UI then do you see any error/failure in the Browser debugger console?
Chrome Browser Menu --> More Tools --> Developer Tools --> Console (Tab)
Also please try to open browser in Incognito mode in order to isolate if it has any Browser caching issue?