grafana/public/app/plugins/datasource/opentsdb/module.ts

import OpenTsDatasource from './datasource';
import { OpenTsQueryCtrl } from './query_ctrl';
import { DataSourcePlugin } from '@grafana/data';
import { ConfigEditor } from './components/ConfigEditor';

class AnnotationsQueryCtrl {
  static templateUrl = 'partials/annotations.editor.html';
}

export const plugin = new DataSourcePlugin(OpenTsDatasource)
  .setQueryCtrl(OpenTsQueryCtrl)
  .setConfigEditor(ConfigEditor)
  .setAnnotationQueryCtrl(AnnotationsQueryCtrl);