opsgenie going away

[Moses Moore]

/> Hello Opsgenie customer, [blah blah] Atlassian is announcing the end
of support/
/> for Opsgenie, effective April 5th 2027. On that date, Opsgenie will
shut down.../
/> In addition, Opsgenie will no longer be available for purchase
effective June 4 2025./

It goes on to talk about migration options, either to Atlassian Compass
or Atlassian-hosted
Jira Service Management.  Pretty sure the latter is just another Jira
instance and we
have "jira_config" in Alertmanager, but it's overkill when we just need
pager schedules.
Atlassian Compass mentions a JSON-based API but neglects to mention what
shape
they expect the incoming JSON to look like. Nevermind, found it in the
Atlassian Dev pages:
https://developer.atlassian.com/cloud/compass/rest/v2/api-group-events/
where "event.alert" exists and no other properties of "event".

Does an Alertmanager Webhook Receiver already exist for Atlassian
Compass, or will I
end up writing one?  (or will I tell my boss to go back to using
PagerDuty...)