doc: Add metrics documentation and add a 'Reference' section · huggingface/text-generation-inference@a2dc281

The following actions uses Node.js version which is deprecated and will be forced to run on node20: docker/build-push-action@v4. For more info: https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/

Input 'config-inline' has been deprecated with message: Use buildkitd-config-inline instead

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