delete https://{hostname}/alerts/v2/alert-definitions//suppressions/
Removes a suppression, and makes an adaptive alert definition reconsider a previously suppressed period of time when modeling your site's expected range of behavior. This operation only applies to adaptive alerts, and responds with an error if applied to a static alert. Suppressions that are too old to affect alert firings are automatically removed, so there is no need to run this operation simply to trim them from the list of modeling suppressions.