pollIntervalBase := time.Millisecond
	nextPollInterval := func() time.Duration {
		// Add 10% jitter.
		interval := pollIntervalBase + time.Duration(rand.Intn(int(pollIntervalBase/10)))
		// Double and clamp for next time.
		pollIntervalBase *= 2
		if pollIntervalBase > shutdownPollIntervalMax {
			pollIntervalBase = shutdownPollIntervalMax
		}
		return interval
	}

		// dependency, and at the moment we don't try to instrument it
		// for coverage. There isn't any technical reason why
		// *_test.go files couldn't be instrumented, but it probably
		// doesn't make much sense to lump together coverage metrics
		// (ex: percent stmts covered) of *_test.go files with
		// non-test Go code.
		if len(p.GoFiles)+len(p.CgoFiles) == 0 {
			continue
		}