If you go to https://logstash-beta.wmflabs.org there is no data sent to it even you change the time span to the last 24 hours.
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Description
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I bounced logstash on deployment-logstash2 and looks like logs are flowing again, logstash-plain.log wasn't being written to before the restart which is a little worrying in itself and makes it non-obvious to understand what's wrong.
I'm resolving this for now but reopen if it happens again.
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Resolving in favor of T205672: Elasticsearch puppet config changes broke puppet in various instances as the underlying cause is ES not logstash in this case.