There isn't a single API Request that can be used to close multiple alerts in Opsgenie.
However you could write a script to loop through the alerts and close them out in Opsgenie.
Please let me know if you have anymore questions on how you could approach this!
If you reach out to Opsgenie support via support.atlassian.com, we have a utility we can run for you to close out multiple alerts if you wish.
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