Aaron Pham

### Feature request Currently pandas IO descriptor doesn't have any validation in `from_http_request` and `to_http_response` It should. ### Motivation _No response_ ### Other _No response_

Currently we have an enum field to determine a file type to support. Under the hood, this is merely a mapping to a coressponding mime type. However this prevents user...

### Describe the bug Currently, content type for grpc are being set via our interceptor to `application/grpc`. While this conform with gRPC standard, this is not really useful for sysadmin....

### Feature request Prometheus interceptor has some difference in metrics implementation, hence we should revisit analytics once more. ### Motivation _No response_ ### Other _No response_

qa: cleanup MLflow

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Cleanup some logic, qa with local postgres, mysql setup of mlflow registry. cleanup some types as well.

### Feature request Exception raised via IO descriptor should be `ValueError` instead of currently implemented `InvalidArgument`. Since `InvalidArgument` eventually end up throwing a server error, this would be a bit...

### Feature request Configuration are versioned #2808 introduces a lot of migration fields for gRPC support, #2984 introduces some configuration refactoring, but `bentoml_configuration` should be versioned and overhaul. Schema validation...

chore: relax pypi restriction

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This PR tries to relax the restriction for PyYAML and docker. I'm not entirely sure the reason for locking this modules before. cc @jjmachan ? Signed-off-by: Aaron Pham

This PR updates docstrings for all Metrics types. This is an effort mentioned in #848 to improve prometheus_client docs.

docs: initial skafolding

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This PR scaffolds the initial Sphinx doc structure for prometheus_client This is a part of #848 in an attempt to better improve `prometheus_client` docstring.