The metric Fragment start latencies is reported in nanoseconds:
Fragment start latencies: count: 39, last: 0.078961ns, min: 0.011105ns, max: 0.541386ns, mean: 0.375923ns, stddev: 0.124721ns
According to my research, and I am probably wrong, but I think it should be reported in seconds (or code which divides it's value by 1000 * 1000 * 1000 should be removed).
Coordinator uses MonotonicStopWatch here:
which returns elapsed time in nanoseconds here:
The problem occurs when elapsed time is converted to seconds here:
despite the fact that the metric definition is already in nanoseconds here: