private void EmitHeartbeat(object unusedState)
{
EventMetadata metadata = new Tracing.EventMetadata();
metadata.Add("MinutesUptime", (long)(DateTime.Now - this.startTime).TotalMinutes);
metadata.Add("MinutesSinceLast", (int)HeartBeatWaitTime.TotalMinutes);
this.tracer.RelatedEvent(EventLevel.Verbose, "Heartbeat", metadata);
}