361dd853e3
This is useful when using `EnvFilter` for multiple identical per-layer filters, as well as with clap and similar libraries that have `Clone` bounds. We generally expect users to be cloning an `EnvFilter` before attaching it to a subscriber, rather than cloning `EnvFilters` that are already attached. Because of this, we reset all the accumulated dynamic state when cloning. This means that some spans and callsites might be missed when an already-attached `EnvFilter` is cloned, but the presence of the dynamic state mean that detaching and attaching `EnvFilter`s to existing subscribers (e.g. with `reload`) already doesn't work very well. This isn't a new class of problem. There was a previous implementation of this in #2398, that shared the dynamic state between all cloned filters behind an `Arc`. I chose not do go for that approach because it causes inconsistencies if the cloned filters are attached to different subscribers. Fixes: #2360 |
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tracing-subscriber
Utilities for implementing and composing tracing subscribers.
Compiler support: requires rustc 1.63+
Supported Rust Versions
Tracing is built against the latest stable release. The minimum supported version is 1.63. 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 1.69, the minimum supported version will not be increased past 1.66, 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.
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.