tree 3a981899f47b93d2d1baecdd69d09d3faa5a49f1
parent 52211e251f2a04056a12f8bfa6ffc4d294a70ad3
author Jacek Centkowski <geminica.programs@gmail.com> 1619641198 +0200
committer Jacek Centkowski <geminica.programs@gmail.com> 1622211639 +0200

Add blocked threads check

Introduce check that detects the blocked threads (enabled by default).
In case when it reaches above the configured percent of all threads (by
default 50%) check fails and instance is considered unhealthy.

Check can:
* be disabled with 'healthcheck.blockedthreads.enabled = false'
* have threshold reconfigured with 'healthcheck.blocked.threshold=XX'

Note that one can fine tune the check to certain group of threads by
configuring threshold for threads with name starting wiht prefix.
For instance in case when Gerrit instance should be considered
unhealthy when 33% of SSH-Interactive-Worker threads are 'BLOCKED'
one can configure it with

  [healthcheck "blockedthreads"]
    threshold = SSH-Interactive-Threads=33

Note that multiple checks for multiple thread group could be
configured (for details with examples see the config.md file).

Bug: Issue 14401
Change-Id: I7d0c4b70decf49465a7318abe4a555cde7318833