Apollo Tracing Support

[michaelstaib]

https://github.com/apollographql/apollo-tracing

[michaelstaib]

private static long nanoTime() {
   long nano = 10000L * Stopwatch.GetTimestamp();
   nano /= TimeSpan.TicksPerMillisecond;
   nano *= 100L;
   return nano;
}

source

[rstaib]

The nanoTime implementation above is dangerous, because it does not consider Stopwatch.Frequency which may differ not just from hardware/OS and uses instead 100L. The following implementation is technically correct.

private static long GetTimestampInNanoseconds()
{
    const long nanosecondsPerSecond = 1000000000;

    return Stopwatch.GetTimestamp() *
        (nanosecondsPerSecond / Stopwatch.Frequency);
}

[rstaib]

This issue depends on #459.