What
A self-hosted runner is a machine you run yourself to host Remote Control sessions, and it can expose a health check that other systems query. That health check now receives a poller for the status of the runner's token, which knows when the runner is due to retire and whether it is shutting down. This only applies when a health port is set.
Why
This is an internal change to how a self-hosted runner reports on itself, so the health check can now tell retirement and shutdown apart from normal running.
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The writer flagged doubt
What the health check does with the retire time and stopping state is not established.