How to use the @instana/core.tracing._getAndResetTracingMetrics function in @instana/core

function sendTracingMetrics() {
  var payload = tracing._getAndResetTracingMetrics();
  agentConnection.sendTracingMetricsToAgent(payload, function(error) {
    if (error) {
      logger.warn('Error received while trying to send tracing metrics to agent: %s', error.message);
      if (typeof error.message === 'string' && error.message.indexOf('Got status code 404')) {
        logger.warn('Apparently the agent does not support POST /tracermetrics, will stop sending tracing metrics.');
        return;
      }
    }
    scheduleTracingMetrics();
  });
}