Struct DecisionTimer 

pub struct DecisionTimer { /* private fields */ }

Time a region whose measurement drives a decision, profiled or not.

span deliberately measures nothing while profiling is off, which is right for reporting and wrong for a measurement the product acts on. A timer whose value picks a backend must produce the same value whether or not an operator passed --profile, or the flag would change routing.

This guard therefore reads the clock unconditionally, returns the elapsed duration to the caller, and additionally records it as a span would when a runtime is current. The name says “decision” so a reader knows at the call site that it costs a clock read even when profiling is off. On a hot path where nothing acts on the value, use span.

Implementations

impl DecisionTimer

pub fn finish(self) -> Duration

Stop the timer, record it when profiling is on, and return the elapsed time.