{
  "id": "server_heartbeat",
  "label": "Server Heartbeat Canonical",
  "phase": "phase-14",
  "category": "fleet_monitoring_mirror_failover",
  "status": "ACTIVE_DH_MIRROR",
  "purpose": "Server Heartbeat Canonical is the Phase 14 authority that turns repeated server liveness into a timing contract for YEFF AI v1 fleet awareness.",
  "function": "Govern heartbeat emission, interval, missed-beat rules, clock tolerance, source identity, degradation state and evidence freshness so Devon can distinguish alive, late, silent and unreachable servers.",
  "technology_requirements": [
    {
      "technology": "Server Heartbeat",
      "required_for": "Server Heartbeat Canonical is the Phase 14 authority that turns repeated server liveness into a timing contract for YEFF AI v1 fleet awareness.",
      "required_by_phase": "phase-14",
      "required_by_category": "server_heartbeat",
      "required_by_buckets": [
        "Prerequisites",
        "Installation",
        "Configuration",
        "Validation",
        "Observable Evidence",
        "Failure Modes & Recovery",
        "Completion & Promotion"
      ],
      "expected_version": "MISSING until Server Heartbeat is implemented and validated in the future Execution & Monitoring Panel",
      "validation_command": "MISSING until server_heartbeat can prove scope, evidence, execution state and promotion decision",
      "evidence_path": "/home/yeff/public_html/devon/canon/execution/state/dh_sources/server_heartbeat.json",
      "status_source": "Documentation Hub + future Execution & Monitoring Panel",
      "blocking_if_missing": true,
      "failure_impact": "If this gate fails, Devon cannot know whether a client server is alive now, was alive earlier, or is silently missing from the fleet."
    }
  ],
  "depends_on": [],
  "used_by": [],
  "overview": {
    "summary": "Server Heartbeat Canonical is the Phase 14 authority that turns repeated server liveness into a timing contract for YEFF AI v1 fleet awareness.",
    "function": "FUNCTION: Govern heartbeat emission, interval, missed-beat rules, clock tolerance, source identity, degradation state and evidence freshness so Devon can distinguish alive, late, silent and unreachable servers.",
    "system_position": "This category owns rhythmic liveness. It is not full health and not runtime observability. The exclusive risk here is temporal blindness. A single successful probe can look healthy long after the server stopped reporting.",
    "failure_impact": "If this gate fails, Devon cannot know whether a client server is alive now, was alive earlier, or is silently missing from the fleet."
  },
  "failure_impact": "If this gate fails, Devon cannot know whether a client server is alive now, was alive earlier, or is silently missing from the fleet."
}