{
  "tenant_id": "tenant-a",
  "project_id": "proj-123",
  "sensor_id": "observer-01",
  "firmware_version": "1.2.3",
  "policy_hash": "sha256:deadbeef",
  "graph_revision_id": "graph-r1",
  "ledger_id": "ledger-789",
  "replay_manifest": "manifest-r1",
  "event_type": "runtime_fact",
  "observed_at": "2025-12-02T00:00:00Z",
  "monotonic_nanos": 123456789,
  "payload": {
    "process": "nginx",
    "pid": 4242
  },
  "payload_hash": "sha256:payloadhash",
  "signature": "dsse://observer-event"
}