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how Flap Detection works in Nagios?

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Flapping occurs when a service or host changes state too frequently, this causes lot of problem and recovery notifications.

Once you have defined Flapping explain how Nagios detects Flapping.

  • Whenever Nagios checks the status of a host or service, it will check to see if it has started or stopped flapping. Nagios follow the below procedure to do that:
  • Storing the results of the last 21 checks of the host or service analyzing the historical check results and determine where state changes/transitions occur.
  • Using the state transitions to determine a percent state change value (a measure of change) for the host or service.
  • Comparing the percent state change value against low and high flapping thresholds
  • A host or service is determined to have started flapping when its percent state change first exceeds a high flapping threshold.
  • A host or service is determined to have stopped flapping when its percent state goes below a low flapping threshold.

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