Logging
Send Grafana Loki alerts to on-call with CallHeim.
Loki ruler alerts via Alertmanager-shaped webhook. CallHeim maps the payload, collapses repeats within five minutes, and pages whoever is on call for the service it belongs to.
Alertmanager groups
A group is split into one alert per member. An incident that holds several alerts stays open while any of them is still firing.
Setting it up
Create an Integration in CallHeim and choose Grafana Loki from the Catalog. You get an ingest URL for that integration — paste it into Grafana Loki’s webhook configuration. The snippet beside this is the shape it expects, with {{WEBHOOK_URL}} replaced by your real URL.
If you enable request signing on this integration, CallHeim requires a valid HMAC-SHA256 signature in the X-ItOnCall-Signature or X-Hub-Signature-256 header on every request to it. Without a signing secret, the ingest URL itself is the credential.
CallHeim includes a payload mapping for Grafana Loki’s webhook format, built and tested against sample payloads.
# alertmanager config used by the Loki ruler:
receivers:
- name: callheim
webhook_configs:
- url: "{{WEBHOOK_URL}}"
send_resolved: trueAfter it arrives
What CallHeim does with Grafana Loki alerts.
Log-derived alerts carry long, near-identical titles. Repeats collapse inside a five-minute window, and alerts with closely similar titles from the same source can be grouped onto one open, unacknowledged incident within ten minutes — word overlap (a similarity of at least 0.6), not semantic matching.
CallHeim maps Grafana Loki’s own severity to a P1–P5 level and shows a separate, explainable severity suggestion — a published keyword ruleset plus your own resolved-incident history — that a person can apply. How severity is suggested →
Each alert source is bound to a service, and the service’s escalation policy (or its team’s) sets who is paged. Alerting and escalation →
CallHeim closes an incident on a recovery event only for sources whose recovery payload it recognises (or that you map). For the others, a person resolves the incident.
The thresholds it passes through
- Dedup window
- 300s
- Flap threshold
- 4 transitions / 600s
- Title correlation
- similarity ≥ 0.6, same source and service
- Group window default
- 600s
All defaults are published. You can turn title correlation off or change its threshold, and set the window on your own noise rules; the dedup window and the flap settings are fixed. How alerts are processed →
Point Grafana Loki at CallHeim and see what it does with your alerts.
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