Incidentio notification provider

[mprince]

Hi Flux team! I would like to know if there is any plan to add IncidentIO for notification-controller? We moved away from Pagerduty and so was considering if that's feasible. I could always use slack or datadog and then hook them up to our alerting service but was wondering if it's on the map. Happy to contribute as well!

[matheuscscp]

@mprince We have no plans on the roadmap for integrating this provider, but we can accept contributions and commitment to maintain it on the long-term

[xchose]

I've implemented this in #1353 — following the same approach as my Zoom provider (#1349). Alert events are posted to an incident.io HTTP alert source: error events fire an alert, recovery events automatically resolve it via a per-object deduplication key. Tested end-to-end against a real incident.io workspace (evidence in the PR).

As requested above: I'm committed to maintaining this provider integration long-term.