{
  "protocolVersion": "v1",
  "fixtureSet": "heartbeat",
  "fixture": "valid",
  "description": "A bounded L0 heartbeat. clientTime is advisory; Connect's receivedAt is online authority.",
  "request": {
    "protocolVersion": "v1",
    "requestId": "550e8400-e29b-41d4-a716-446655440000",
    "agentVersion": "rustfs-agent/1.19.4",
    "capabilities": ["heartbeat", "inventory"],
    "sequence": 42,
    "clientTime": "2026-08-22T01:02:03Z",
    "coarseNodeSummary": {"total": 8, "healthy": 7, "degraded": 1}
  },
  "expected": {
    "decision": "ACCEPT",
    "acceptedVersion": "v1",
    "responseFields": ["serverTime", "acceptedVersion", "capabilityHints"],
    "onlineAuthority": "serverTime"
  }
}