{
  "$id": "https://stella-ops.org/schemas/zastava/observer_event.schema.json",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "properties": {
    "event_type": {
      "enum": [
        "runtime_fact",
        "drift",
        "policy_violation",
        "heartbeat"
      ]
    },
    "firmware_version": {
      "minLength": 1,
      "type": "string"
    },
    "graph_revision_id": {
      "minLength": 1,
      "type": "string"
    },
    "ledger_id": {
      "type": "string"
    },
    "monotonic_nanos": {
      "type": "integer"
    },
    "observed_at": {
      "format": "date-time",
      "type": "string"
    },
    "payload": {
      "description": "Canonical runtime payload (JCS) used for hashing.",
      "type": "object"
    },
    "payload_hash": {
      "description": "sha256 over canonical JSON (JCS) of payload",
      "pattern": "^sha256:[0-9a-f]{64}$",
      "type": "string"
    },
    "policy_hash": {
      "minLength": 1,
      "type": "string"
    },
    "project_id": {
      "minLength": 1,
      "type": "string"
    },
    "replay_manifest": {
      "type": "string"
    },
    "sensor_id": {
      "minLength": 1,
      "type": "string"
    },
    "signature": {
      "description": "DSSE envelope reference",
      "pattern": "^dsse://[A-Za-z0-9._:/-]+$",
      "type": "string"
    },
    "tenant_id": {
      "minLength": 1,
      "type": "string"
    }
  },
  "required": [
    "tenant_id",
    "project_id",
    "sensor_id",
    "firmware_version",
    "policy_hash",
    "graph_revision_id",
    "event_type",
    "observed_at",
    "payload",
    "payload_hash",
    "signature"
  ],
  "title": "Zastava Observer Event",
  "type": "object"
}