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A machine with several availability checks shows one summary check, and its health reads only that summary. The summary ranked every observed failure equally and broke ties by target id. So a check that had failed once, below its threshold, could hide a later-sorting check with a confirmed outage. The outage check's own row carried `availability_unreachable` while the machine it monitors read healthy. - `availabilityCheckPriority` now ranks a confirmed outage first, then any other observed failure, then unchecked/ambiguous/unresolved, then passing. Ties still go to the first target id. - `availabilityOutageConfirmed` is the one confirmation rule, shared by the ranking and `EvaluateResourceHealth`. It mirrors the poller's incident gate: observed failures at the threshold, an unavailable aggregate when one is reported, and no indeterminate outcome. A probe agent that stops reporting keeps its old failure count but confirms nothing, on its own row or on the target. - Tests in `availability_link_test.go` go through the registry projection path: a confirmed outage behind an earlier unconfirmed failure (and its recovery), and a silent probe agent's stale failure count. Both fail without the change. `health_test.go`'s legacy fixture gains the `LastChecked` every producer sets. - The `unified-resources.md` contract describes the summary ranking and the shared rule. Drawers already list every check from `availabilityChecks`, and availability incidents live on each check's own row, so alert synthesis is unchanged.