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# What is done? - resolves #19403 - Adds build-time Rust compiler detection and captures the rustc --version value during the build. - Exposes the captured compiler version from the Rust extension via a new Python-callable function. - Exports a new Prometheus metric for rustc version. # How to test? - compile `poetry install` - add `enable_metrics: true` and ```yaml resources: - compress: false names: - client - federation - metrics ``` to homeserver.yaml - start synapse - find the rustc version at `http://localhost:8008/_synapse/metrics` ### Pull Request Checklist <!-- Please read https://element-hq.github.io/synapse/latest/development/contributing_guide.html before submitting your pull request --> * [x] Pull request is based on the develop branch * [x] Pull request includes a [changelog file](https://element-hq.github.io/synapse/latest/development/contributing_guide.html#changelog). The entry should: - Be a short description of your change which makes sense to users. "Fixed a bug that prevented receiving messages from other servers." instead of "Moved X method from `EventStore` to `EventWorkerStore`.". - Use markdown where necessary, mostly for `code blocks`. - End with either a period (.) or an exclamation mark (!). - Start with a capital letter. - Feel free to credit yourself, by adding a sentence "Contributed by @github_username." or "Contributed by [Your Name]." to the end of the entry. * [x] [Code style](https://element-hq.github.io/synapse/latest/code_style.html) is correct (run the [linters](https://element-hq.github.io/synapse/latest/development/contributing_guide.html#run-the-linters)) --------- Co-authored-by: Quentin Gliech <quenting@element.io>