Send a test notification

Hands a test alert to the app's Alertmanager, which posts it to the channel within a minute and a resolve five minutes later. On PagerDuty this opens an incident, which pages whoever is on call.

curl -X POST "https://example.com/api/workspaces/string/apps/string/channels/string/test"

{  "ok": true,  "status": 0,  "error": "string"}