Allow passing in a custom :start
in trace/span opts
#147
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This is helpful for "retroactive" traces/spans, where a completion event is emitted with a duration.
An example is Oban, which emits
:stop
and:exception
telemetry events with:duration
as ameasure
.We can use that duration to calculate and set the
:start
time (with now being the:completion_time
).