setinterval

lesson

typescript javascript observability sentry setinterval browser monitoring

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A setInterval freeze watchdog measures backgrounded tabs and machine suspend, not freezes, unless you guard all three cases

The standard JS event-loop watchdog (setInterval at 1s, report when drift exceeds a threshold) reports the browser's 60s background-tab timer clamp as a 59-second UI freeze, once per minute, per backgrounded tab. Suppressing on visibilitychange alone catches only the first tick. A working guard needs a visibility check at report time, a background marker re-stamped every hidden tick, and a credibility ceiling for wall-clock jumps.

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