Add tracing crate examples to log

[joshka]

Actually adding the recipes is reasonably easy,. I note that the contribution guidelines say not to add new crates though.

I wonder if adding an "Alternatives" section to each recipe could be worth doing, or if this would be best done by adding a tracing version of each log recipe?

[AndyGauge]

I found a direct tie between the cookbook and the playground so I recommend any crate that is blessed.rs or top 100 and already in the playground. I checked top 100 and did not find tracing.

[joshka]

It's in blessed.rs, so that seems reasonable to add. I ask because I've seen comments on a few places (various discord, reddit posts etc.) about how approachable getting started in tracing can be. I wanted to contribute recipes for it.

I went down the rabbit hole of trying to understand the playground inclusion criteria. There's likely a lot of crates that deserve to be on the playground list but that are overshadowed by crates that are used internally by many other crates rather than used directly. It might be nice to fix that someday.

I'm going to add an extra section alongside the log section with tracing equivalents.

[joshka]

jamesgraves#2 is a start - useing the other repo code included from a cargo project approach. I'll move things over to this repo at some point once done (unless you end up instead merging that repo, which would be great).

[AndyGauge]

It's in blessed.rs

Then it is blessed by the cookbook.

[joshka]

I noticed that the version by @john-cd already has this in https://john-cd.com/rust_howto/categories/development-tools_debugging/tracing.html, so rather than re-inventing the wheel, I'd suggest incorporating / merging those changes back into the cookbook from https://github.com/john-cd/rust_howto/tree/main

[AndyGauge]

I see a difference in licensing, and it would take them opening a pr and making it CC0 for it to be allowed.

[john-cd]

@AndyGauge @joshka - all examples in my book are CC0. Feel free to copy them into the Rust Cookbook.

Note that there is a lot of stuff that is hidden from view in the book at this point - so check the GitHub.

For tracing examples: https://github.com/john-cd/rust_howto/tree/main/deps/tests/categories/development_tools_debugging

Just add a link to https://github.com/john-cd/rust_howto and https://john-cd.com/rust_howto/ somewhere!