[mellie-bee]

This is a fairly major change, but it's also fully end-to-end testable using the included helper programs and is small/simple enough to explain on a single sheet of paper.

The way this works is extremely simple:

Context cancellation powers the entire shutdown: when calling manager.Run(ctx), it waits on <-ctx.Done(). This is the only exit condition, and shuts down the fetchers (cancelling their context and ending them) first, followed by the workers.

select {
case <-ctx.Done():
	fetcher.StopAndWait()
	m.pool.StopAndWait()
	return ctx.Err()
}

see v2/cmd/echo/main.go for a full, complete example of how to use this as a consumer.

[leegm-pp]

Partial review - will have a further look tomorrow. Couple of thoughts so far though

[github-actions]

🎉 This PR is included in version 1.0.2 🎉

The release is available on GitHub release

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