Add monotonic_time to span measurements #92
Merged
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We did not add this originally because we said we were waiting for a use case. Well, the use case has arrived: we are using telemetry events to measure the idle time (the time between the last stop and the next start event). :) This helps us do that without recomputing the monotonic times. In terms of costs, the added costs here are negligent (1 word extra in the map values tuple).