AppPlugin: add an init function (#17150)

packages/grafana-ui/src/types/app.ts

@@ -26,6 +26,13 @@ export class AppPlugin extends GrafanaPlugin<AppPluginMeta> {
   // Old style pages
   angularPages?: { [component: string]: any };
 
+  /**
+   * Called after the module has loaded, and before the app is used.
+   * This function may be called multiple times on the same instance.
+   * The first time, `this.meta` will be undefined
+   */
+  init(meta: AppPluginMeta) {}
+
   /**
    * Set the component displayed under:
    *   /a/${plugin-id}/*