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docs(monitoring): define HTTP probe fallback contract

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rcourtman 2026-08-08 20:03:19 +01:00
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docs/release-control/v6/internal/subsystems/monitoring.md
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@ -618,6 +618,10 @@ only graft them onto fixture data.
poll-provider path. `internal/monitoring/availability_poller.go` owns ICMP,
TCP, and HTTP probes, provider health, scheduler task construction, and
supplemental unified-resource records for saved availability targets.
HTTP and HTTPS probes start with `HEAD` and retry once with `GET` only when
the endpoint explicitly reports that `HEAD` is unsupported (`405 Method
Not Allowed` or `501 Not Implemented`). Other server-error responses remain
failed probes and must not be converted into reachability evidence.
Failed endpoint probes are observed runtime state for that target; they
must publish provider health and incidents without dead-lettering the
scheduler task itself.