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+# Diagnostics Channel Support
+
+Stability: Experimental.
+
+Undici supports the [`diagnostics_channel`](https://nodejs.org/api/diagnostics_channel.html) (currently available only on Node.js v16+).
+It is the preferred way to instrument Undici and retrieve internal information.
+
+The channels available are the following.
+
+## `undici:request:create`
+
+This message is published when a new outgoing request is created.
+
+```js
+import diagnosticsChannel from 'diagnostics_channel'
+
+diagnosticsChannel.channel('undici:request:create').subscribe(({ request }) => {
+  console.log('origin', request.origin)
+  console.log('completed', request.completed)
+  console.log('method', request.method)
+  console.log('path', request.path)
+  console.log('headers') // raw text, e.g: 'bar: bar\r\n'
+  request.addHeader('hello', 'world')
+  console.log('headers', request.headers) // e.g. 'bar: bar\r\nhello: world\r\n'
+})
+```
+
+Note: a request is only loosely completed to a given socket.
+
+
+## `undici:request:bodySent`
+
+```js
+import diagnosticsChannel from 'diagnostics_channel'
+
+diagnosticsChannel.channel('undici:request:bodySent').subscribe(({ request }) => {
+  // request is the same object undici:request:create
+})
+```
+
+## `undici:request:headers`
+
+This message is published after the response headers have been received, i.e. the response has been completed.
+
+```js
+import diagnosticsChannel from 'diagnostics_channel'
+
+diagnosticsChannel.channel('undici:request:headers').subscribe(({ request, response }) => {
+  // request is the same object undici:request:create
+  console.log('statusCode', response.statusCode)
+  console.log(response.statusText)
+  // response.headers are buffers.
+  console.log(response.headers.map((x) => x.toString()))
+})
+```
+
+## `undici:request:trailers`
+
+This message is published after the response body and trailers have been received, i.e. the response has been completed.
+
+```js
+import diagnosticsChannel from 'diagnostics_channel'
+
+diagnosticsChannel.channel('undici:request:trailers').subscribe(({ request, trailers }) => {
+  // request is the same object undici:request:create
+  console.log('completed', request.completed)
+  // trailers are buffers.
+  console.log(trailers.map((x) => x.toString()))
+})
+```
+
+## `undici:request:error`
+
+This message is published if the request is going to error, but it has not errored yet.
+
+```js
+import diagnosticsChannel from 'diagnostics_channel'
+
+diagnosticsChannel.channel('undici:request:error').subscribe(({ request, error }) => {
+  // request is the same object undici:request:create
+})
+```
+
+## `undici:client:sendHeaders`
+
+This message is published right before the first byte of the request is written to the socket.
+
+*Note*: It will publish the exact headers that will be sent to the server in raw format.
+
+```js
+import diagnosticsChannel from 'diagnostics_channel'
+
+diagnosticsChannel.channel('undici:client:sendHeaders').subscribe(({ request, headers, socket }) => {
+  // request is the same object undici:request:create
+  console.log(`Full headers list ${headers.split('\r\n')}`);
+})
+```
+
+## `undici:client:beforeConnect`
+
+This message is published before creating a new connection for **any** request.
+You can not assume that this event is related to any specific request.
+
+```js
+import diagnosticsChannel from 'diagnostics_channel'
+
+diagnosticsChannel.channel('undici:client:beforeConnect').subscribe(({ connectParams, connector }) => {
+  // const { host, hostname, protocol, port, servername } = connectParams
+  // connector is a function that creates the socket
+})
+```
+
+## `undici:client:connected`
+
+This message is published after a connection is established.
+
+```js
+import diagnosticsChannel from 'diagnostics_channel'
+
+diagnosticsChannel.channel('undici:client:connected').subscribe(({ socket, connectParams, connector }) => {
+  // const { host, hostname, protocol, port, servername } = connectParams
+ // connector is a function that creates the socket
+})
+```
+
+## `undici:client:connectError`
+
+This message is published if it did not succeed to create new connection
+
+```js
+import diagnosticsChannel from 'diagnostics_channel'
+
+diagnosticsChannel.channel('undici:client:connectError').subscribe(({ error, socket, connectParams, connector }) => {
+  // const { host, hostname, protocol, port, servername } = connectParams
+  // connector is a function that creates the socket
+  console.log(`Connect failed with ${error.message}`)
+})
+```
+
+## `undici:websocket:open`
+
+This message is published after the client has successfully connected to a server.
+
+```js
+import diagnosticsChannel from 'diagnostics_channel'
+
+diagnosticsChannel.channel('undici:websocket:open').subscribe(({ address, protocol, extensions }) => {
+  console.log(address) // address, family, and port
+  console.log(protocol) // negotiated subprotocols
+  console.log(extensions) // negotiated extensions
+})
+```
+
+## `undici:websocket:close`
+
+This message is published after the connection has closed.
+
+```js
+import diagnosticsChannel from 'diagnostics_channel'
+
+diagnosticsChannel.channel('undici:websocket:close').subscribe(({ websocket, code, reason }) => {
+  console.log(websocket) // the WebSocket object
+  console.log(code) // the closing status code
+  console.log(reason) // the closing reason
+})
+```
+
+## `undici:websocket:socket_error`
+
+This message is published if the socket experiences an error.
+
+```js
+import diagnosticsChannel from 'diagnostics_channel'
+
+diagnosticsChannel.channel('undici:websocket:socket_error').subscribe((error) => {
+  console.log(error)
+})
+```
+
+## `undici:websocket:ping`
+
+This message is published after the client receives a ping frame, if the connection is not closing.
+
+```js
+import diagnosticsChannel from 'diagnostics_channel'
+
+diagnosticsChannel.channel('undici:websocket:ping').subscribe(({ payload }) => {
+  // a Buffer or undefined, containing the optional application data of the frame
+  console.log(payload)
+})
+```
+
+## `undici:websocket:pong`
+
+This message is published after the client receives a pong frame.
+
+```js
+import diagnosticsChannel from 'diagnostics_channel'
+
+diagnosticsChannel.channel('undici:websocket:pong').subscribe(({ payload }) => {
+  // a Buffer or undefined, containing the optional application data of the frame
+  console.log(payload)
+})
+```