How to monitor that logstash has stopped listening on tcp listener?

Logstash 5.6.4, on CentOS

We are exploring the logstash monitoring system.

Specifically, we see logstash run fine for awhile, but then stop listening on TCP, and the logstash log (/var/log/logstash/logstash-plain.log) fills with:

[2017-11-17T00:05:44,321][ERROR][logstash.outputs.elasticsearch] Encountered a retryable error. Will Retry with exponential backoff {:code=>400, :url=>"http://<IP of ES server>:9200/_bulk"}

So far, we do not see any monitor tags that will tell us that errors are occurring, or that the tcp listener is hung.

We looked at a number of monitor stats, when the system was hung (output is here: ), and have not spotted a monitor that would alert us to the problem.

What are we missing?

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