Volume spike event payload

Sent when a project’s total error volume spikes above its learned baseline. See Error volume anomaly detection for details on how spikes are detected.

The subject of this event is the project (not an individual error), so the payload has no fault. Spike facts are in the volume_spike object:

• observed — the number of errors in the most recent one-hour window
• baseline_median — the project’s typical errors-per-hour (median of the trailing baseline window)
• factor — the observed volume as a multiple of the baseline median (e.g. 4.7 means 4.7× the typical rate); null when the baseline is near zero
• z_score — the modified z-score that triggered the alert
• window_minutes — the length of the observed window, in minutes

{
  "event": "volume_spike",
  "message": "[Testy McTestFace] Errors are 4.7× your normal rate (412 in the last hour vs ~87/hr typical)",
  "project": {
    "id": 123321,
    "name": "Testy McTestFace",
    "created_at": "2017-08-30T12:54:33.156695Z",
    "disable_public_links": false,
    "pivotal_project_id": null,
    "asana_workspace_id": null,
    "token": "zzz111",
    "github_project": "spacely/testy-mctestface",
    "environments": [
      {
        "id": 68210,
        "project_id": 123321,
        "name": "production",
        "notifications": true,
        "created_at": "2017-09-05T06:10:19.057794Z",
        "updated_at": "2017-09-05T06:10:19.057794Z"
      }
    ],
    "owner": {
      "id": 1,
      "email": "ben@example.com",
      "name": "Spacely Sprockets"
    },
    "last_notice_at": "2023-10-30T19:29:08.000000Z",
    "earliest_notice_at": "2023-05-03T19:37:25.519130Z",
    "unresolved_fault_count": 102,
    "fault_count": 925,
    "active": true,
    "users": [
      {
        "id": 1,
        "email": "ben@example.com",
        "name": "Ben"
      }
    ],
    "sites": [],
    "team_id": 1
  },
  "volume_spike": {
    "observed": 412,
    "baseline_median": 87,
    "factor": 4.7,
    "z_score": 6.2,
    "window_minutes": 60
  }
}