meta {
  name: List Instances
  type: http
  seq: 1
}

get {
  url: {{coordinatorBaseUrl}}/api/coordinator/instances
  body: none
  auth: inherit
}

settings {
  encodeUrl: true
  timeout: 0
}

docs {
    Returns all known core instances from the in-memory registry.
    Registry is populated via gRPC heartbeats from core instances.
  
    Response: InstanceMetadata[]
      instanceId:        string   — unique instance ID
      hostname:          string
      httpPort:          int
      grpcPort:          int
      subscriptionCount: int      — number of active game subscriptions
      localCacheSize:    int
      lastHeartbeat:     string   — ISO-8601 timestamp
      state:             string   — "HEALTHY" | "DEAD"
}