grafana/public/app/plugins/datasource/graphite/config_ctrl.ts

export class GraphiteConfigCtrl {
  static templateUrl = 'public/app/plugins/datasource/graphite/partials/config.html';
  datasourceSrv: any;
  current: any;

  /** @ngInject */
  constructor($scope, datasourceSrv) {
    this.datasourceSrv = datasourceSrv;
    this.current.jsonData = this.current.jsonData || {};
    this.current.jsonData.graphiteVersion = this.current.jsonData.graphiteVersion || '0.9';
    this.autoDetectGraphiteVersion();
  }

  autoDetectGraphiteVersion() {
    if (!this.current.id) {
      return;
    }

    this.datasourceSrv
      .loadDatasource(this.current.name)
      .then(ds => {
        return ds.getVersion();
      })
      .then(version => {
        this.graphiteVersions.push({ name: version, value: version });
        this.current.jsonData.graphiteVersion = version;
      });
  }

  graphiteVersions = [
    { name: '0.9.x', value: '0.9' },
    { name: '1.0.x', value: '1.0' },
    { name: '1.1.x', value: '1.1' },
  ];
}