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The path segment is an alert id, or an episode id with `episodes=true`. Acknowledging closes it: an alert resolves, an episode ends its alerting window, and the next breaching reading opens a new one. The patient's triggers decide what else closing does (their `onAck` hooks). Under the default pack, acknowledging an open out-of-bed alert (103214-3) also silences the absence under way. Idempotent: acknowledging again returns the original time and actor. Acknowledging one that already closed only stamps the acknowledgement. ### Through ovok - **Who can call it:** Manager apps, and users whose access policy grants the capabilities. - **Capabilities, all required:** `signals_alerts:update`. Project admins have every capability; client applications get no admin bypass. - ovok sets `project` to your project, so you can leave it out. - If your access covers only some patients (anyone but project admins, manager or submitter apps, and anyone whose Patient access has no criteria), the alert's patient must be one you can update: ovok reads the alert first. A patient is named by its Signals id, or by its Medplum Patient id where Signals takes a `refId`; ovok asks Signals which patient a Signals id is.