feat: add filter affected services internal endpoint

[matiasb]

Related to https://github.com/grafana/oncall-private/issues/2977

e.g.

GET /api/plugins/grafana-oncall-app/resources/alertgroups/filter_affected_services?service=service-a&service=service-b

[
  {"name": "service-a",
   "service_url": "http://localhost:3000/a/grafana-slo-app/service/service-a",
   "alert_groups_url": "http://localhost:3000/a/grafana-oncall-app/alert-groups?status=0&status=1&started_at=now-7d_now&label=service_name:service-a"}
]

[vstpme]

LGTM

[joeyorlando]

LGTM 👍

---

More out of curiosity, was does "affected" mean in this context? It just means Alert Groups that have a service_name label, right?

Or is it more robust than that and has to do w/ service dependencies? (ie. if Service A depends on Service B and Service B is "degraded", return me Service A).

Also, isn't filter_affected_services mostly just doing label key:value filtering? (if so, don't we have an existing endpoint for this?)

[matiasb]

More out of curiosity, was does "affected" mean in this context? It just means Alert Groups that have a service_name label, right?

Or is it more robust than that and has to do w/ service dependencies? (ie. if Service A depends on Service B and Service B is "degraded", return me Service A).

Also, isn't filter_affected_services mostly just doing label key:value filtering? (if so, don't we have an existing endpoint for this?)

Original implementation would find out upstream service dependencies for service-a and only return those with recent active alert groups (which could be related to a given alert group belonging to service-a). In our first implementation though, frontend will get all service dependencies and this endpoint will filter from there the ones which are affected only (meaning there are recent alert groups with active alert groups), besides returning some additional data (URLs).

Makes sense? Happy to rename as needed.

[joeyorlando]

frontend will get all service dependencies and this endpoint will filter from there the ones which are affected only

ahh okay, makes sense 🙂 thanks!