You can get a list of all non-expired alerts like this:
| rest/servicesNS/-/-alerts/fired_alerts/-
| table trigger_time author eai:acl.owner eai:acl.app savedsearch_name sid eai:acl.sharing digets_mode id published *
| rename eai:acl.* AS *
| where trigger_time >= relative_time(now(), "-10m@m")
This should help you get started
index=_audit action="alert_fired"
| rename ss_name AS alert_name
| sort alert_name, _time
| delta _time as timediff
| streamstats count as rownum by alert_name reset_on_change=true
| eval timediff=if(rownum==1, null(), abs(timediff))
| where timediff<600
This will give you all alerts which triggered less than 10 mins apart.
hope this helps