Proposal: do.Shutdown returning shutdown time ?

My monolith application relies a lot on do.Shutdownable interface. Some tasks call database or third-parties, and flush buffer.

I would like to measure the time of the do.Shutdown processing.

API proposal: duration, err := do.Shutdown()

duration would be either a time.Duration or:

type ShutdownDuration struct {
    All time.Duration
    Services map[string]time.Duration
}

WDYT ?

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