GelfWriter: Use async work queue and add feature metric stats #5329
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The work queue also provides logging for free from #5280.
The additional feature stats are available inside the
icinga
check too and can be forwarded to Graphite, InfluxDB, etc. ... well and as CheckResult to Graylog again ;-)Note: I'll add the
check_command
attribute for advanced filtering in a separate PR.The REST API /v1/status/GelfWriter endpoint also adds the
connected
andsource
attributes (inspired by by DB IDO).fixes #4532