tracing-log

This release contains two breaking changes: the removal of the env_logger and trace_logger features. Below are the suggested migration paths:

• env_logger: users should use tracing_subscriber::fmt::Subscriber or tracing_subscriber::fmt::Layer with the Targets or EnvFilter filters instead.
• trace_logger: users should use the tracing crate's "log" feature flag instead.

Breaking Changes

• Remove deprecated env_logger feature. This removes the dependency on the unmaintained atty crate, resolving the security advisory GHSA-g98v-hv3f-hcfr/RUSTSEC-2021-0145. (#2771)
• Remove deprecated trace_logger feature. (#2771)

Added

• Make trace and metrics features optional
• ExportResult as specified in the specification
• Add Futures compatibility API
• Added serde serialize support to SpanData
• Separate OpenTelemetry Jaeger crate

Changed

• Rename HttpTraceContextPropagator to TraceContextPropagator
• Rename HttpB3Propagator to B3Propagator
• Switch to Apache 2 license
• Resolve agent addresses to allow non-static IP
• Remove tracer name prefix from span name

Removed

• Remove add_link from spans

Changes

• Deprecated env_logger feature in favor of tracing_subscriber::fmt::Subscriber ([#2752])

#[2752]: https://github.com/tokio-rs/tracing/pull/2752

Added

• Parent option for default sampler

Fixed

• SDK tracer default span id

Added

• log-tracer: Added LogTracer::with_interest_cache to enable a limited form of per-record Interest caching for log records (#1636)

Changed

• Updated minimum supported Rust version (MSRV) to Rust 1.49.0 (#1913)

Fixed

• log-tracer: Fixed LogTracer not honoring tracing max level filters (#1543)
• Broken links in documentation (#2068, #2077)

Thanks to @Millione, @teozkr, @koute, @Folyd, and @ben0x539 for contributing to this release!

Changed

• Ensure spans are always send and sync
• Allow static lifetimes for span names
• Improve KeyValue ergonomics

Added

• Re-export the log crate so that users can ensure consistent versions ([#602])
• AsLog implementation for tracing::LevelFilter (#1248)
• AsTrace implementation for log::LevelFilter (#1248)

Fixed

• log-tracer: Fixed Log::enabled implementation for LogTracer not calling Subscriber::enabled (#1254)
• log-tracer: Fixed Log::enabled implementation for LogTracer not checking the max level hint (#1247)
• Several documentation fixes (#483, #485, #537, #595, #941, [#981])

Added

• Implement global provider

Deprecated

• TraceLogger (use tracing's "log" and "log-always" feature flags instead)

Fixed

• Issues with log/std feature flag (#406)
• Minor documentation issues (#405, #408)

Added

• Documentation and API cleanup
• Tracking of active spans via thread local span stack

• Initial release

Initial debug alpha