I need help troubleshooting a problem that occurred Saturday night, with no change to the configuration: Logstash stopped emitting events to Elasticsearch. There is nothing in the logs that I can see to indicate any problem. I restarted the Logstash daemon, as well as tried different output configurations, to no effect.
Logstash is configured with a persistent queue, and new logs are being accumulated in it, but are apparently not processed further. The only messages that are sent further to Elasticsearch are the self-monitoring events generated by Logstash itself.
The Logstash version is 5.5.2, running on Linux. The configuration is nothing special, if rather verbose - a few inputs and some filters, with a single output to Elasticsearch. Again, the problem started during the night with no change to the config, which makes me suspect an environmental cause.
Thanks for your thoughts!