[Feature Request] Add alert observable API endpoints

[nadouani]

Request Type

Feature Request

Problem Description

The goal of this feature request is to add API endpoints to handle Alert observables:

• POST /api/alert/{ALERT_ID}/artifact to add a new observable to the alert
• PATCH /api/alert/artifact/{ARTIFACT_ID} to update a existing alert observable
• DELETE /api/alert/artifact/{ARTIFACT_ID} to delete an existing alert observable