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Document RUST_LOG=trace for additional logging verbosity (#1670) 

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## Summary

This improves Contributing documentation to specifically mention `trace`
level logging can be obtained via `RUST_LOG=trace uv …` as mentioned
here:
https://github.com/astral-sh/uv/issues/1569#issuecomment-1951489407

## Test Plan

Compare the output of

```
uv pip install --verbose requests
```

and

```
RUST_LOG=trace uv pip install --verbose requests
```
This commit is contained in:
Olivier Le Floch 2024-02-18 16:21:32 -08:00 committed by GitHub
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CONTRIBUTING.md
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@ -80,3 +80,11 @@ RUST_LOG=uv=info TRACING_DURATIONS_FILE=target/traces/jupyter.ndjson cargo run -
```shell
RUST_LOG=uv=info TRACING_DURATIONS_FILE=target/traces/jupyter.ndjson cargo run --features tracing-durations-export --bin uv-dev --profile profiling -- resolve jupyter
```
### Trace-level logging
You can enable `trace` level logging using the `RUST_LOG` environment variable, i.e.
```shell
RUST_LOG=trace uv …
```