How to use the @grafana/runtime.setEchoSrv function in @grafana/runtime

initEchoSrv() {
    setEchoSrv(new Echo({ debug: process.env.NODE_ENV === 'development' }));

    ttiPolyfill.getFirstConsistentlyInteractive().then((tti: any) => {
      // Collecting paint metrics first
      const paintMetrics = performance && performance.getEntriesByType ? performance.getEntriesByType('paint') : [];

      for (const metric of paintMetrics) {
        reportPerformance(metric.name, Math.round(metric.startTime + metric.duration));
      }
      reportPerformance('tti', tti);
    });

    registerEchoBackend(new PerformanceBackend({}));

    window.addEventListener('DOMContentLoaded', () => {
      reportPerformance('dcl', Math.round(performance.now()));
    });