Reply To: Ambari Metrics {{zookeeper_quorum_hosts}} evaluating to localhost

Can you check what is the free memory available on the Collector host when AMS is not running?
The /var/log/message might tell you why it died, if the heap does not have a chance to grow, I have seen HBase getting the sigterm.
You should be able to correlate the time that it went down with the time in /var/log/messages.