Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+![Tracing — Structured, application-level diagnostics][splash]
+
+[splash]: https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/splash.svg
+
+# tracing-log
+
+[`log`] compatibility for [`tracing`].
+
+[![Crates.io][crates-badge]][crates-url]
+[![Documentation][docs-badge]][docs-url]
+[![Documentation (master)][docs-master-badge]][docs-master-url]
+[![MIT licensed][mit-badge]][mit-url]
+[![Build Status][actions-badge]][actions-url]
+[![Discord chat][discord-badge]][discord-url]
+![maintenance status][maint-badge]
+
+[Documentation][docs-url] | [Chat (discord)][discord-url]
+
+
+[crates-badge]: https://img.shields.io/crates/v/tracing-log.svg
+[crates-url]: https://crates.io/crates/tracing-log
+[docs-badge]: https://docs.rs/tracing-log/badge.svg
+[docs-url]: https://docs.rs/tracing-log
+[docs-master-badge]: https://img.shields.io/badge/docs-master-blue
+[docs-master-url]: https://tracing-rs.netlify.com/tracing_log
+[mit-badge]: https://img.shields.io/badge/license-MIT-blue.svg
+[mit-url]: LICENSE
+[actions-badge]: https://github.com/tokio-rs/tracing/workflows/CI/badge.svg
+[actions-url]:https://github.com/tokio-rs/tracing/actions?query=workflow%3ACI
+[discord-badge]: https://img.shields.io/discord/500028886025895936?logo=discord&label=discord&logoColor=white
+[discord-url]: https://discord.gg/EeF3cQw
+[maint-badge]: https://img.shields.io/badge/maintenance-experimental-blue.svg
+
+## Overview
+
+[`tracing`] is a framework for instrumenting Rust programs with context-aware,
+structured, event-based diagnostic information. This crate provides
+compatibility layers for using `tracing` alongside the logging facade provided
+by the [`log`] crate.
+
+This crate provides:
+
+- [`AsTrace`] and [`AsLog`] traits for converting between `tracing` and `log` types.
+- [`LogTracer`], a [`log::Log`] implementation that consumes [`log::Record`]s
+  and outputs them as [`tracing::Event`]s.
+- An [`env_logger`] module, with helpers for using the [`env_logger` crate]
+  with `tracing` (optional, enabled by the `env_logger` feature).
+
+[`tracing`]: https://crates.io/crates/tracing
+[`log`]: https://crates.io/crates/log
+[`AsTrace`]: https://docs.rs/tracing-log/latest/tracing_log/trait.AsTrace.html
+[`AsLog`]: https://docs.rs/tracing-log/latest/tracing_log/trait.AsLog.html
+[`LogTracer`]: https://docs.rs/tracing-log/latest/tracing_log/struct.LogTracer.html
+[`log::Log`]: https://docs.rs/log/latest/log/trait.Log.html
+[`log::Record`]: https://docs.rs/log/latest/log/struct.Record.html
+[`tracing::Subscriber`]: https://docs.rs/tracing/latest/tracing/trait.Subscriber.html
+[`tracing::Event`]: https://docs.rs/tracing/latest/tracing/struct.Event.html
+
+*Compiler support: [requires `rustc` 1.49+][msrv]*
+
+[msrv]: #supported-rust-versions
+
+## Supported Rust Versions
+
+Tracing is built against the latest stable release. The minimum supported
+version is 1.49. The current Tracing version is not guaranteed to build on Rust
+versions earlier than the minimum supported version.
+
+Tracing follows the same compiler support policies as the rest of the Tokio
+project. The current stable Rust compiler and the three most recent minor
+versions before it will always be supported. For example, if the current stable
+compiler version is 1.45, the minimum supported version will not be increased
+past 1.42, three minor versions prior. Increasing the minimum supported compiler
+version is not considered a semver breaking change as long as doing so complies
+with this policy.
+
+## License
+
+This project is licensed under the [MIT license](LICENSE).
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in Tracing by you, shall be licensed as MIT, without any additional
+terms or conditions.