Timed actions that take less then 1ms can be missed in the metrics.

Since 1ms is the smallest unit of time available to the Metrics, any action that takes less 1ms can be counted as 0ms. Given the right circumstances, over time the loss of the fractional ms can add up to produce incorrect results.

Metric times should be recorded in nano seconds, and converted to the appropriate unit upon usage.

Start by tracing how Metrics records action durations and where those values are converted for use. Check the aggregation path for sub-millisecond actions and verify that nanosecond precision is preserved without changing the reported units.

Written by the indexing model from the issue text.