Telling late notifications from missing ones

Trigger a harmless event and record when it occurred and when each notification channel displayed it. Compare email, push, and in-app notices separately; one channel can lag while others work.

Check permissions and background settings on the affected device before treating it as a service outage. A notification that eventually arrives is delayed; one that never appears after a reasonable window may be missing. Avoid sharing private message contents in a public report.

Which channel and device are affected?