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prometheus/client: implement protobuf exposition format

Giedrius Statkevičius requested to merge giedrius.statkevicius1/prometheus-client-mmap:add_protobuf_exposition into master

Implement the Protobuf exposition format. Protobuf file has been copied from https://github.com/prometheus/client_model. Please pardon the code quality - I'm relatively new to Rust and just wanted to get something working. Is this something you would be interested in? I could clean up the code and add the missing pid label.

Also, I see that single-process formatting is pretty much broken and ignored? The only used value class has true hardcoded in the multiprocessing field so the C/Rust extension is always used AFAICT. Thus, do I also need on adding protobuf support to the single-process mode?

I would like to work on native histograms after this is merged. Let me know your comments/suggestions! Thank you.

Signed-off-by: Giedrius Statkevičius giedrius.statkevicius@vinted.com

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