# Package io.vertx.core.spi.metrics

- Interface Summary
  Interface | Description
  --- | ---
  ClientMetrics<M,​Req,​Resp> | The client metrics SPI that Vert.x will use to call when client events occur.
  DatagramSocketMetrics | The datagram/udp metrics SPI which Vert.x will use to call when each event occurs pertaining to datagram sockets.
  EventBusMetrics<H> | The event bus metrics SPI which Vert.x will use to call when each event occurs.
  HttpClientMetrics<R,​W,​S> | The http client metrics SPI that Vert.x will use to call when http client events occur.
  HttpServerMetrics<R,​W,​S> | The http server metrics SPI that Vert.x will use to call when each http server event occurs.
  Metrics | The metrics interface is implemented by metrics providers that wants to provide monitoring of Vert.x core.
  MetricsProvider | Metrics provider is the base SPI used by metrics implementations to retrieve a `Metrics` object.
  NetworkMetrics<S> | An SPI used internally by Vert.x to gather metrics on a net socket which serves as a base class for TCP or UDP.
  PoolMetrics<Q,​T> | Worker pool metrics
  TCPMetrics<S> | An SPI used internally by Vert.x to gather metrics on a net socket which serves as a base class for things like HttpServer and HttpClient, all of which serve TCP connections.
  VertxMetrics | The main Vert.x metrics SPI which Vert.x will use internally.