doc: add built-in dc for module loading

doc/api/diagnostics_channel.md

@@ -1117,6 +1117,64 @@ Emitted when server receives a request.
 
 Emitted when server sends a response.
 
+#### Modules
+
+`module.require.start`
+
+* `event` {Object} containing the following properties
+  * `id` - Argument passed to `require()`. Module name.
+  * `name` - Event name.
+  * `parentFilename` - Name of the module that attempted to require(id).
+
+Emitted when `require()` is executed
+
+`module.require.end`
+
+* `event` {Object} containing the following properties
+  * `id` - Argument passed to `require()`. Module name.
+  * `name` - Event name.
+  * `parentFilename` - Name of the module that attempted to require(id).
+
+Emitted when a `require()` call returns
+
+`module.require.error`
+
+* `event` {Object} containing the following properties
+  * `id` - Argument passed to `require()`. Module name.
+  * `name` - Event name.
+  * `parentFilename` - Name of the module that attempted to require(id).
+* `error` {Error}
+
+Emitted when a `require()` throws an error
+
+`module.import.asyncStart`
+
+* `event` {Object} containing the following properties
+  * `id` - Argument passed to `import()`. Module name.
+  * `name` - Event name.
+  * `parentURL` - URL object of the module that attempted to import(id).
+
+Emitted when `import()` is invoked.
+
+`module.import.asyncEnd`
+
+* `event` {Object} containing the following properties
+  * `id` - Argument passed to `import()`. Module name.
+  * `name` - Event name.
+  * `parentURL` - URL object of the module that attempted to import(id).
+
+Emitted when `import()` has completed.
+
+`module.import.error`
+
+* `event` {Object} containing the following properties
+  * `id` - Argument passed to `import()`. Module name.
+  * `name` - Event name.
+  * `parentURL` - URL object of the module that attempted to import(id).
+* `error` {Error}
+
+Emitted when a `import()` throws an error
+
 #### NET
 
 `net.client.socket`