Move diagnostics to `diagnostics` domain (#24931).

pkg/analysis_server/tool/spec/generated/java/AnalysisServer.java

 /*
  * Copyright (c) 2015, the Dart project authors.
  *
  * Licensed under the Eclipse Public License v1.0 (the "License"); you may not use this file except
  * in compliance with the License. You may obtain a copy of the License at
  *
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Unless required by applicable law or agreed to in writing, software distributed under the License
  * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
@@ skipping 255 matching lines @@
    * {@code completion.getSuggestions}
    *
    * Request that completion suggestions for the given offset in the given file be returned.
    *
    * @param file The file containing the point at which suggestions are to be made.
    * @param offset The offset within the file at which suggestions are to be made.
    */
   public void completion_getSuggestions(String file, int offset, GetSuggestionsConsumer consumer);
 
   /**
+   * {@code diagnostic.getDiagnostics}
+   *
+   * Return server diagnostics.
+   */
+  public void diagnostic_getDiagnostics(GetDiagnosticsConsumer consumer);
+
+  /**
    * {@code edit.format}
    *
    * Format the contents of a single file. The currently selected region of text is passed in so that
    * the selection can be preserved across the formatting operation. The updated selection will be as
    * close to matching the original as possible, but whitespace at the beginning or end of the
    * selected region will be ignored. If preserving selection information is not required, zero (0)
    * can be specified for both the selection offset and selection length.
    *
    * If a request is made for a file which does not exist, or which is not currently subject to
    * analysis (e.g. because it is not associated with any analysis root specified to
@@ skipping 150 matching lines @@
    * Subscribe for services. All previous subscriptions are replaced by the given set of services.
    *
    * It is an error if any of the elements in the list are not valid services. If there is an error,
    * then the current subscriptions will remain unchanged.
    *
    * @param subscriptions A list of the services being subscribed to.
    */
   public void execution_setSubscriptions(List<String> subscriptions);
 
   /**
-   * {@code experimental.getDiagnostics}
-   *
-   * Return server diagnostics.
-   */
-  public void experimental_getDiagnostics(GetDiagnosticsConsumer consumer);
-
-  /**
    * Return {@code true} if the socket is open.
    */
   public boolean isSocketOpen();
 
   /**
    * Remove the given listener from the list of listeners that will receive notification when new
      * analysis results become available.
    *
    * @param listener the listener to be removed
    */
@@ skipping 94 matching lines @@
    * the response to this request has been sent.
    */
   public void server_shutdown();
 
   /**
    * Start the analysis server.
    */
   public void start() throws Exception;
 
 }