Grafana

Add a webhook contact point so that a firing alert rings your iPhone instead of only sending a notification. Uses the contact point's Custom Payload, which lets you send exactly the JSON the API expects.

1. Create the contact point

Alerting, Contact points, Add contact point. Choose the Webhook integration and fill in:

2. Set the payload template

Under Optional Webhook settings, enable Custom Payload and paste:

{% raw %}

{{ coll.Dict "fire_in" 0 "title" (printf "%s: %s" (.Status | toUpper) .CommonLabels.alertname) | data.ToJSON }}

{% endraw %}

coll.Dict and data.ToJSON build the JSON, so an alert name containing a quote or a backslash is escaped correctly. fire_in: 0 rings within a minute of the alert (the API's minimum lead time is 30 seconds) without any date arithmetic in the template. .Status is firing or resolved; .CommonLabels.alertname is the alert rule name.

3. Do not ring when the alert resolves

Grafana sends a second notification when the alert resolves, which would ring again. Turn on Disable resolved message on the contact point so only firing alerts reach Signalarm. If you do want a resolved alarm, leave it off; the title starts with RESOLVED: so you can tell them apart.

Test it

Contact points, the contact point's menu, Test. Send a test notification; your iPhone should ring within a minute with the title FIRING: TestAlert.

Older Grafana without Custom Payload

Versions without the Custom Payload option send Grafana's own JSON, which the API does not understand. Put a small relay in between (a Cloudflare Worker, a Home Assistant webhook trigger that calls the Home Assistant recipe, or a shell script on a server) that receives the Grafana payload and issues the POST /v1/alarms call.

Reference: API reference