heroku-buildpack-rust
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Support for `WEB_CONCURRENCY`
This buildpack doesn't set the WEB_CONCURRENCY environment variable. For example, the official Python buildpack sets it. I'm guessing that this is set by Heroku themselves, and the buildpacks just expose it. Here's a link that mentions the use of WEB_CONCURRENCY for Python.
Could you look into this, and add support if it's feasible and makes sense for Rust servers?