## Check Flapping The flapping algorithm used in Icinga 2 does not store the past states but calculcates the flapping threshold from a single value based on counters and half-life values. Icinga 2 compares the value with a single flapping threshold configuration attribute named `flapping_threshold`. > **Note** > > Flapping must be explicitely enabled setting the `Service` object attribute > `enable_flapping = 1`.