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tracing-subscriber-0.2.0

tracing-subscriber-0.2.0: subscriber: prepare to release 0.2.0 stable (#567)
@hawkw hawkw tagged this 04 Feb 23:30 
# 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)

Fixes #515
Fixes #458 

Signed-off-by: Eliza Weisman <eliza@buoyant.io>
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