tree 03a84fa1f543c6d3b3f4ee0f3e602827ad456da8
parent 4294ad0b803c4e4ff6da4e72fe6f6c0df93cbd72
author Daniele Sassoli <danielesassoli@gmail.com> 1698458968 -0700
committer Daniele Sassoli <danielesassoli@gmail.com> 1698884999 +0000

Add the ability to fail healthcheck by creating a fail file

This will enable the Gerrit Admin to cause healthcheck failures by
simply creating a file at a configurable location.
This is useful when a node needs to be taken  out of the pool of
available nodes, for example while it undergoes maintanence and should
not be serving requests.

This approach is instantaneous, unlike enabling/disabling the plugin as
Gerrit only unloads/reloads plugins once every 'plugins.frequency'.
The file approach gives more immediate feedback as the healthcheck
will start failing as soon as the file is created, even if we're
already processing the request.

Change-Id: I999ca049cff9213d3720a982530a5b03f2d02e44