How to use the @grafana/runtime.EchoEventType.Performance function in @grafana/runtime

duration: number;
}

export interface PerformanceEvent extends EchoEvent {}

export interface PerformanceBackendOptions {
  url?: string;
}

/**
 * Echo's performance metrics consumer
 * Reports performance metrics to given url (TODO)
 */
export class PerformanceBackend implements EchoBackend {
  private buffer: PerformanceEvent[] = [];
  supportedEvents = [EchoEventType.Performance];

  constructor(public options: PerformanceBackendOptions) {}

  addEvent = (e: EchoEvent) => {
    this.buffer.push(e);
  };

  flush = () => {
    if (this.buffer.length === 0) {
      return;
    }

    const result = {
      metrics: this.buffer,
    };