This function acknowledges alerts by id.
Doesn't return any data.
jetapi backup -F acknowledgeAlerts -D '_id[]=5b297ce3d5ac5e49c20e59e3&_id[]=5b2a382ad5ac5e1d0410482a'
https://hostname.example.com:2087/cpsess##########/cgi/addons/jetbackup/api.cgi?function=acknowledgeAlerts&_id[]=5b297ce3d5ac5e49c20e59e3&_id[]=5b2a382ad5ac5e1d0410482a