Problem: Logger.get_process_level and Logger.put_process_level functions were added on Elixir 1.15. What should we do here? A few options:

• checking elixir version in runtime, adding a small overhead
• wait until we can require elixir >= 1.15
• write a different implementation for elixir >= 1.15

Edit: I decided for the last option, but am open to change if you disagree

What if we fix the metadata initially and we address the level once we require Elixir v1.15?

I like the idea of propagating logger metadata too, certainly can add that!
With regards to the level, I assume we want to support Elixir <1.15 for at least one year more (1.15.0 is not even one year old yet), and delaying this fix until then doesn't seem to be worth it. The two variants of pmap seem relatively low cost to me. WDYT?

is everything inside of Logger.get/put_process_level also dependent on Elixir 1.15 or is there anything we can inline?

It's very Elixir-version dependent, I'd say.

Before 1.15 there was Logger.enable/1, Logger.disable/1 and Logger.enabled?/1. We could use that, but it's a more limited feature (and is now deprecated in favor of the new APIs).

On the flip side, we did not have this feature for years, we can wait one or two more before adding it. :)

That's fair enough, @josevalim. I'll close this one.