system.heartbeat
Feed liveness.
Feed liveness.
| Event type | system.heartbeat |
|---|---|
| Scope | source |
| Idempotency key | Stable across retries and derived only from source data: HL7 {sourceId}:{feedKey}:{MSH-7 ms}:{MSH-10}:{eventKey}, FHIR {sourceId}:fhir:{type}/{id}/_history/{version}:{n}. |
| Since | 1.0 |
| HL7 v2 | — |
| FHIR R4 | — |
When to send
Every 60 seconds per feed.
What it changes
- Feed liveness: 5 minutes of silence shows delayed, 15 minutes down (F-16).
JSON Schema
Example
{ "specVersion": "1.0", "id": "demo-epic-bridges:hb:1789398000", "type": "system.heartbeat", "occurredAt": "2026-09-14T11:00:00-04:00", "source": { "kind": "ehr", "system": "epic", "feed": "adt" }, "data": { "queueDepth": 0 }}