# 0.2.3 (March 5, 2020)
### Fixed
- **env-filter**: Regression where filter directives were selected in the order
they were listed, rather than most specific first (#624)
# 0.2.2 (February 27, 2020)
### Added
- **fmt**: Added `flatten_event` to `SubscriberBuilder` (#599)
- **fmt**: Added `with_level` to `SubscriberBuilder` (#594)
# 0.2.1 (February 13, 2020)
### Changed
- **filter**: `EnvFilter` directive selection now behaves correctly (i.e. like
`env_logger`) (#583)
### Fixed
- **filter**: Fixed `EnvFilter` incorrectly allowing less-specific filter
directives to enable events that are disabled by more-specific filters (#583)
- **filter**: Multiple significant `EnvFilter` performance improvements,
especially when filtering events generated by `log` records (#578, #583)
- **filter**: Replaced `BTreeMap` with `Vec` in `DirectiveSet`, improving
iteration performance significantly with typical numbers of filter directives
(#580)
A big thank-you to @samschlegel for lots of help with `EnvFilter` performance
tuning in this release!
# 0.2.0 (February 4, 2020)
### Breaking Changes
- **fmt**: Renamed `Context` to `FmtContext` (#420, #425)
- **fmt**: Renamed `Builder` to `SubscriberBuilder` (#420)
- **filter**: Removed `Filter`. Use `EnvFilter` instead (#434)
### Added
- **registry**: `Registry`, a `Subscriber` implementation that `Layer`s can use
as a high-performance, in-memory span store. (#420, #425, #432, #433, #435)
- **registry**: Added `LookupSpan` trait, implemented by `Subscriber`s to expose
stored span data to `Layer`s (#420)
- **fmt**: Added `fmt::Layer`, to allow composing log formatting with other `Layer`s
- **fmt**: Added support for JSON field and event formatting (#377, #415)
- **filter**: Documentation for filtering directives (#554)
### Changed
- **fmt**: Renamed `Context` to `FmtContext` (#420, #425) (BREAKING)
- **fmt**: Renamed `Builder` to `SubscriberBuilder` (#420) (BREAKING)
- **fmt**: Reimplemented `fmt::Subscriber` in terms of the `Registry`
and `Layer`s (#420)
### Removed
- **filter**: Removed `Filter`. Use `EnvFilter` instead (#434) (BREAKING)
### Fixed
- **fmt**: Fixed memory leaks in the slab used to store per-span data
(3c35048)
- **fmt**: `fmt::SubscriberBuilder::init` not setting up `log` compatibility
(#489)
- **fmt**: Spans closed by a child span closing not also closing _their_
parents (#514)
- **Layer**: Fixed `Layered` subscribers failing to downcast to their own type
(#549)
- **Layer**: Fixed `Layer::downcast_ref` returning invalid references (#454)
# 0.2.0-alpha.6 (February 3, 2020)
### Fixed
- **fmt**: Fixed empty `{}` printed after spans with no fields (f079f2d)
- **fmt**: Fixed inconsistent formatting when ANSI colors are disabled (506a482)
- **fmt**: Fixed mis-aligned levels when ANSI colors are disabled (eba1adb)
- Fixed warnings on nightly Rust compilers (#558)
# 0.2.0-alpha.5 (January 31, 2020)
### Added
- **env_filter**: Documentation for filtering directives (#554)
- **registry**, **env_filter**: Updated `smallvec` dependency to 0.1 (#543)
### Fixed
- **registry**: Fixed a memory leak in the slab used to store per-span data
(3c35048)
- **Layer**: Fixed `Layered` subscribers failing to downcast to their own type
(#549)
- **fmt**: Fixed a panic when multiple layers insert `FormattedFields`
extensions from the same formatter type (1c3bb70)
- **fmt**: Fixed `fmt::Layer::on_record` inserting a new `FormattedFields` when
formatted fields for a span already exist (1c3bb70)
# 0.2.0-alpha.4 (January 11, 2020)
### Fixed
- **registry**: Removed inadvertently committed `dbg!` macros (#533)
# 0.2.0-alpha.3 (January 10, 2020)
### Added
- **fmt**: Public `FormattedFields::new` constructor (#478)
- **fmt**: Added examples to `fmt::Layer` documentation (#510)
- Documentation now shows what feature flags are required by each API item (#525)
### Fixed
- **fmt**: Missing space between timestamp and level (#480)
- **fmt**: Incorrect formatting with `with_target(false)` (#481)
- **fmt**: `fmt::SubscriberBuilder::init` not setting up `log` compatibility
(#489)
- **registry**: Spans exited out of order not being closed properly on exit
(#509)
- **registry**: Memory leak when spans are closed by a child span closing (#514)
- **registry**: Spans closed by a child span closing not also closing _their_
parents (#514)
- Compilation errors with `no-default-features` (#499, #500)
# 0.2.0-alpha.2 (December 8, 2019)
### Added
- `LookupSpans` implementation for `Layered` (#448)
- `SpanRef::from_root` to iterate over a span's parents from the root (#460)
- `Context::scope`, to iterate over the current context from the root (#460)
- `Context::lookup_current`, which returns a `SpanRef` to the current
span's data (#460)
### Changed
- Lifetimes on some new `Context` methods to be less restrictive (#460)
### Fixed
- `Layer::downcast_ref` returning invalid references (#454)
- Compilation failure on 32-bit platforms (#462)
- Compilation failure with ANSI formatters (#438)
# 0.2.0-alpha.1 (November 18, 2019)
### Added
- `Registry`, a reusable span store that `Layer`s can use a
high-performance, in-memory store. (#420, #425, #432, #433, #435)
- Reimplemented `fmt::Subscriber` in terms of the `Registry`
and `Layer`s (#420)
- Add benchmarks for fmt subscriber (#421)
- Add support for JSON field and event formatting (#377, #415)
### Changed
- **BREAKING**: Change `fmt::format::FormatFields` and
`fmt::format::FormatEvent` to accept a mandatory `FmtContext`. These
`FormatFields` and `FormatEvent` will likely see additional breaking
changes in subsequent alpha. (#420, #425)
- **BREAKING**: Removed `Filter`. Use `EnvFilter` instead (#434)
### Contributers
Thanks to all the contributers to this release!
- @pimeys for #377 and #415
# 0.1.6 (October 29, 2019)
### Added
- Add `init` and `try_init` functions to `FmtSubscriber` (#385)
- Add `ChronoUtc` and `ChronoLocal` timers, RFC 3339 support (#387)
- Add `tracing::subscriber::set_default` which sets the default
subscriber and returns a drop guard. This drop guard will reset the
dispatch on drop (#388).
### Fixed
- Fix default level for `EnvFilter`. Setting `RUST_LOG=target`
previously only the `ERROR` level, while it should enable everything.
`tracing-subscriber` now defaults to `TRACE` if no level is specified
(#401)
- Fix `tracing-log` feature flag for init + try_init. The feature flag
`tracing_log` was used instead of the correct `tracing-log`. As a
result, both `tracing-log` and `tracing_log` needed to be specified in
order to initialize the global logger. Only `tracing-log` needs to be
specified now (#400).
### Contributers
Thanks to all the contributers to this release!
- @emschwartz for #385, #387, #400 and #401
- @bIgBV for #388
# 0.1.5 (October 7, 2019)
### Fixed
- Spans not being closed properly when `FmtSubscriber::current_span` is used
(#371)
# 0.1.4 (September 26, 2019)
### Fixed
- Spans entered twice on the same thread sometimes being completely exited when
the more deeply-nested entry is exited (#361)
- Setting `with_ansi(false)` on `FmtSubscriber` not disabling ANSI color
formatting for timestamps (#354)
- Incorrect reference counting in `FmtSubscriber` that could cause spans to not
be closed when all references are dropped (#366)
# 0.1.3 (September 16, 2019)
### Fixed
- `Layered` subscribers not properly forwarding calls to `current_span`
(#350)
# 0.1.2 (September 12, 2019)
### Fixed
- `EnvFilter` ignoring directives with targets that are the same number of
characters (#333)
- `EnvFilter` failing to properly apply filter directives to events generated
from `log` records by`tracing-log` (#344)
### Changed
- Renamed `Filter` to `EnvFilter`, deprecated `Filter` (#339)
- Renamed "filter" feature flag to "env-filter", deprecated "filter" (#339)
- `FmtSubscriber` now defaults to enabling only the `INFO` level and above when
a max level filter or `EnvFilter` is not set (#336)
- Made `parking_lot` dependency an opt-in feature flag (#348)
### Added
- `EnvFilter::add_directive` to add new directives to filters after they are
constructed (#334)
- `fmt::Builder::with_max_level` to set a global level filter for a
`FmtSubscriber` without requiring the use of `EnvFilter` (#336)
- `Layer` implementation for `LevelFilter` (#336)
- `EnvFilter` now implements `fmt::Display` (#329)
### Removed
- Removed dependency on `crossbeam-util` (#348)
# 0.1.1 (September 4, 2019)
### Fixed
- Potential double panic in `CurrentSpan` (#325)
# 0.1.0 (September 3, 2019)
- Initial release