# Flapping

> A check or alarm that switches between failing and healthy repeatedly in a short time, producing a stream of open and close alerts.

URL: https://pagerless.dev/glossary/flapping
Updated: 2026-10-22

## In Pagerless

One escalation per problem: a problem never pages twice in parallel.

## Related terms

- [Alert noise](https://pagerless.dev/glossary/noise): Alerts that don't need anyone to act: duplicates, known background errors, bots probing dead URLs, flapping checks.