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Partially related: CoroutineScope.produce has no way to use a channel with onUndeliveredElement handler.  Is `produce` basically on the same deprecation path as actor? Should I roll my own produce if I need `onUndeliveredElement` on the channel?

Please, submit an issue with with your use-case. The whole support for `onUndeliveredElement` is really a niche feature, so it was not propagated to all of the high-level APIs (e.g. flows don’t support it out-of-the-box either). Btw, it is pretty straightforward to roll out your own version of `produce` that creates a channel with `onUndeliveredElement`.

I have already made my peace with the fact that flows won’t support leak-free passing of resources. The channel abstraction otoh seems to explicitly support it. So I’d like to use it to dispose of undelivered producer resources in face of cancellation. I will describe I’m issue, as you requested 

<https://github.com/Kotlin/kotlinx.coroutines/issues/3755>