Merging upstream version 1.69.0+dfsg1.

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

1 files changed, 0 insertions, 902 deletions

diff --git a/vendor/tracing-subscriber-0.3.3/CHANGELOG.md b/vendor/tracing-subscriber-0.3.3/CHANGELOG.md
deleted file mode 100644
index c380ff3b1..000000000
--- a/vendor/tracing-subscriber-0.3.3/CHANGELOG.md
+++ /dev/null
@@ -1,902 +0,0 @@
-# 0.3.3 (Nov 29, 2021)
-
-This release fixes a pair of regressions in `tracing-subscriber`'s `fmt` module.
-
-### Fixed
-
-- **fmt**: Fixed missing event fields with `Compact` formatter ([#1755])
-- **fmt**: Fixed `PrettyFields` formatter (and thus `format::Pretty` event
-  formatter) ignoring the `fmt::Layer`'s ANSI color code configuration ([#1747])
-
-[#1755]: https://github.com/tokio-rs/tracing/pull/1755
-[#1747]: https://github.com/tokio-rs/tracing/pull/1747
-
-# 0.3.2 (Nov 19, 2021)
-
-### Fixed
-
-- **fmt**: Fixed `MakeWriter` filtering not working with `BoxMakeWriter`
-  ([#1694])
-
-### Added
-
-- **fmt**: `Writer::has_ansi_escapes` method to check if an output supports ANSI
-  terminal formatting escape codes ([#1696])
-- **fmt**: Added additional ANSI terminal formatting to field formatters when
-  supported ([#1702])
-- **fmt**: Added `FmtContext::span_scope`, `FmtContext::event_scope`, and
-  `FmtContext::parent_span` methods for accessing the current span and its scope
-  when formatting an event ([#1728])
-- **fmt**: Improved documentation on implementing event formatters ([#1727])
-
-[#1694]: https://github.com/tokio-rs/tracing/pull/1694
-[#1696]: https://github.com/tokio-rs/tracing/pull/1696
-[#1702]: https://github.com/tokio-rs/tracing/pull/1702
-[#1728]: https://github.com/tokio-rs/tracing/pull/1728
-[#1727]: https://github.com/tokio-rs/tracing/pull/1727
-# 0.3.1 (Oct 25, 2021)
-
-This release fixes a few issues related to feature flagging.
-
-### Fixed
-
-- **time**: Compilation error when enabling the "time" feature flag without also
-  enabling the "local-time" feature flag ([#1685])
-- **registry**: Unused method warnings when the "std" feature is enabled but the
-  "registry" feature is disabled ([#1686])
-
-[#1685]: https://github.com/tokio-rs/tracing/pull/1685
-[#1686]: https://github.com/tokio-rs/tracing/pull/1686
-
-# 0.3.0 (Oct 22, 2021)
-
-This is a breaking release of `tracing-subscriber`. The primary breaking change
-in this release is the removal of the dependency on the [`chrono` crate], due to
-[RUSTSEC-2020-0159]. To replace `chrono`, support is added for formatting
-timestamps using the [`time` crate] instead.
-
-In addition, this release includes a number of other breaking API changes, such
-as adding (limited) support for `#![no_std]` targets, removing previously
-deprecated APIs, and more.
-
-### Breaking Changes
-
-- Removed APIs deprecated in the v0.2.x release series.
-- Renamed `Layer::new_span` to `Layer::on_new_span` ([#1674])
-- Removed `Layer` impl for `Arc<L: Layer<S>>` and `Arc<dyn Layer<S> + ...>`
-  ([#1649])
-- Replaced the [`chrono` crate] with the [`time` crate] for timestamp formatting, to
-  resolve [RUSTSEC-2020-0159] ([#1646])
-- Removed `json` and `env-filter` from default features. They must now be
-  enabled explictly ([#1647]). This means that `RUST_LOG`-based filters _will not_
-  work unless the `env-filter` feature is enabled.
-- Changed `FormatEvent::format_event` and `FormatFields::format_fields`
-  trait methods to take a `Writer` type, rather than a `&mut dyn fmt::Write`
-  trait object ([#1661])
-- Changed the signature of the `MakeWriter` trait by adding a lifetime parameter
-  ([#781])
-
-### Changed
-
-- **layer**: Renamed `Layer::new_span` to `Layer::on_new_span` ([#1674])
-- **fmt**: Changed `FormatEvent::format_event` and `FormatFields::format_fields`
-  trait methods to take a `Writer` type, rather than a `&mut dyn fmt::Write`
-  trait object ([#1661])
-- **json**, **env-filter**: `json` and `env-filter` feature flags are no longer
-  enabled by default ([#1647])
-### Removed
-
-- Removed deprecated `CurrentSpan` type ([#1320])
-- **registry**: Removed deprecated `SpanRef::parents` iterator, replaced by
-  `SpanRef::scope` in [#1431] ([#1648)])
-- **layer**: Removed deprecated `Context::scope` iterator, replaced by
-  `Context::span_scope` and `Context::event_scope` in [#1431] and [#1434]
-  ([#1648)])
-- **layer**: Removed `Layer` impl for `Arc<L: Layer<S>>` and
-   `Arc<dyn Layer<S> + ...>`. These interfere with per-layer filtering. ([#1649])
-- **fmt**: Removed deprecated `LayerBuilder` type ([#1673])
-- **fmt**: Removed `fmt::Layer::on_event` (renamed to `fmt::Layer::fmt_event`)
-  ([#1673])
-- **fmt**, **chrono**: Removed the `chrono` feature flag and APIs for using the
-  [`chrono` crate] for timestamp formatting ([#1646])
-### Added
-
-- **fmt**, **time**: `LocalTime` and `UtcTime` types for formatting timestamps
-  using the [`time` crate] ([#1646])
-- **fmt**: Added a lifetime parameter to the `MakeWriter` trait, allowing it to
-  return a borrowed writer. This enables implementations of `MakeWriter` for
-  types such as `Mutex<T: io::Write>` and `std::fs::File`. ([#781])
-- **env-filter**: Documentation improvements ([#1637])
-- Support for some APIs on `#![no_std]` targets, by disabling the `std` feature
-  flag ([#1660])
-
-Thanks to @Folyd and @nmathewson for contributing to this release!
-
-[#1320]: https://github.com/tokio-rs/tracing/pull/1320
-[#1673]: https://github.com/tokio-rs/tracing/pull/1673
-[#1674]: https://github.com/tokio-rs/tracing/pull/1674
-[#1646]: https://github.com/tokio-rs/tracing/pull/1646
-[#1647]: https://github.com/tokio-rs/tracing/pull/1647
-[#1648]: https://github.com/tokio-rs/tracing/pull/1648
-[#1649]: https://github.com/tokio-rs/tracing/pull/1649
-[#1660]: https://github.com/tokio-rs/tracing/pull/1660
-[#1661]: https://github.com/tokio-rs/tracing/pull/1661
-[#1431]: https://github.com/tokio-rs/tracing/pull/1431
-[#1434]: https://github.com/tokio-rs/tracing/pull/1434
-[#781]: https://github.com/tokio-rs/tracing/pull/781
-
-[`chrono` crate]: https://crates.io/crates/chrono
-[`time` crate]: https://crates.io/crates/time
-[RUSTSEC-2020-0159]: https://rustsec.org/advisories/RUSTSEC-2020-0159.html
-
-# 0.2.25 (October 5, 2021)
-
-This release fixes an issue where a `Layer` implementation's custom
-`downcast_raw` implementation was lost when wrapping that layer with a per-layer
-filter.
-
-### Fixed
-
-- **registry**: Forward `Filtered::downcast_raw` to wrapped `Layer` ([#1619])
-
-### Added
-
-- Documentation improvements ([#1596], [#1601])
-
-Thanks to @bryanburgers for contributing to this release!
-
-[#1619]: https://github.com/tokio-rs/tracing/pull/1619
-[#1601]: https://github.com/tokio-rs/tracing/pull/1601
-[#1596]: https://github.com/tokio-rs/tracing/pull/1596
-
-# 0.2.24 (September 19, 2021)
-
-This release contains a number of bug fixes, including a fix for
-`tracing-subscriber` failing to compile on the minimum supported Rust version of
-1.42.0. It also adds `IntoIterator` implementations for the `Targets` type.
-
-### Fixed
-
-- Fixed compilation on Rust 1.42.0 ([#1580], [#1581])
-- **registry**: Ensure per-layer filter `enabled` state is cleared when a global
-  filter short-circuits filter evaluation ([#1575])
-- **layer**: Fixed `Layer::on_layer` not being called for `Box`ed `Layer`s,
-  which broke  per-layer filtering ([#1576])
-
-### Added
-
-- **filter**: Added `Targets::iter`, returning an iterator over the set of
-  target-level pairs enabled by a `Targets` filter ([#1574])
-- **filter**:  Added `IntoIterator` implementations for `Targets` and `&Targets`
-  ([#1574])
-
-Thanks to new contributor @connec for contributing to this release!
-
-[#1580]: https://github.com/tokio-rs/tracing/pull/1580
-[#1581]: https://github.com/tokio-rs/tracing/pull/1581
-[#1575]: https://github.com/tokio-rs/tracing/pull/1575
-[#1576]: https://github.com/tokio-rs/tracing/pull/1576
-[#1574]: https://github.com/tokio-rs/tracing/pull/1574
-
-# 0.2.23 (September 16, 2021)
-
-This release fixes a few bugs in the per-layer filtering API added in v0.2.21.
-
-### Fixed
-
-- **env-filter**: Fixed excessive `EnvFilter` memory use ([#1568])
-- **filter**: Fixed a panic that may occur in debug mode when using per-layer
-  filters together with global filters ([#1569])
-- Fixed incorrect documentation formatting ([#1572])
-
-[#1568]: https://github.com/tokio-rs/tracing/pull/1568
-[#1569]: https://github.com/tokio-rs/tracing/pull/1569
-[#1572]: https://github.com/tokio-rs/tracing/pull/1572
-
-# 0.2.22 (September 13, 2021)
-
-This fixes a regression where the `filter::ParseError` type was accidentally
-renamed.
-
-### Fixed
-
-- **filter**: Fix `filter::ParseError` accidentally being renamed to
-  `filter::DirectiveParseError` ([#1558])
-
-[#1558]: https://github.com/tokio-rs/tracing/pull/1558
-
-# 0.2.21 (September 12, 2021)
-
-This release introduces the [`Filter`] trait, a new API for [per-layer
-filtering][plf]. This allows controlling which spans and events are recorded by
-various layers individually, rather than globally.
-
-In addition, it adds a new [`Targets`] filter, which provides a lighter-weight
-version of the filtering provided by [`EnvFilter`], as well as other smaller API
-improvements and fixes.
-
-### Deprecated
-
-- **registry**: `SpanRef::parent_id`, which cannot properly support per-layer
-  filtering. Use `.parent().map(SpanRef::id)` instead. ([#1523])
-
-### Fixed
-
-- **layer** `Context` methods that are provided when the `Subscriber` implements
-  `LookupSpan` no longer require the "registry" feature flag ([#1525])
-- **layer** `fmt::Debug` implementation for `Layered` no longer requires the `S`
-  type parameter to implement `Debug` ([#1528])
-
-### Added
-
-- **registry**: `Filter` trait, `Filtered` type, `Layer::with_filter` method,
-  and other APIs for per-layer filtering ([#1523])
-- **filter**: `FilterFn` and `DynFilterFn` types that implement global (`Layer`)
-  and per-layer (`Filter`) filtering for closures and function pointers
-  ([#1523])
-- **filter**: `Targets` filter, which implements a lighter-weight form of
-  `EnvFilter`-like filtering ([#1550])
-- **env-filter**: Added support for filtering on floating-point values ([#1507])
-- **layer**: `Layer::on_layer` callback, called when layering the `Layer` onto a
-`Subscriber` ([#1523])
-- **layer**: `Layer` implementations for `Box<L>` and `Arc<L>` where `L: Layer`
-  ([#1536])
-- **layer**: `Layer` implementations for `Box<dyn Layer<S> + Send + Sync + 'static>`
-  and `Arc<dyn Layer<S> + Send + Sync + 'static>` ([#1536])
-- A number of small documentation fixes and improvements ([#1553], [#1544],
-  [#1539], [#1524])
-
-Special thanks to new contributors @jsgf and @maxburke for contributing to this
-release!
-
-[`Filter`]: https://docs.rs/tracing-subscriber/0.2.21/tracing_subscriber/layer/trait.Filter.html
-[plf]: https://docs.rs/tracing-subscriber/0.2.21/tracing_subscriber/layer/index.html#per-layer-filtering
-[`Targets`]: https://docs.rs/tracing-subscriber/0.2.21/tracing_subscriber/filter/struct.Targets.html
-[`EnvFilter`]: https://docs.rs/tracing-subscriber/0.2.21/tracing_subscriber/filter/struct.EnvFilter.html
-[#1507]: https://github.com/tokio-rs/tracing/pull/1507
-[#1523]: https://github.com/tokio-rs/tracing/pull/1523
-[#1524]: https://github.com/tokio-rs/tracing/pull/1524
-[#1525]: https://github.com/tokio-rs/tracing/pull/1525
-[#1528]: https://github.com/tokio-rs/tracing/pull/1528
-[#1539]: https://github.com/tokio-rs/tracing/pull/1539
-[#1544]: https://github.com/tokio-rs/tracing/pull/1544
-[#1550]: https://github.com/tokio-rs/tracing/pull/1550
-[#1553]: https://github.com/tokio-rs/tracing/pull/1553
-
-# 0.2.20 (August 17, 2021)
-
-### Fixed
-
-- **fmt**: Fixed `fmt` printing only the first `source` for errors with a chain
-  of sources ([#1460])
-- **fmt**: Fixed missing space between level and event in the `Pretty` formatter
-  ([#1498])
-- **json**: Fixed `Json` formatter not honoring `without_time` and `with_level`
-  configurations ([#1463])
-
-### Added
-
-- **registry**: Improved panic message when cloning a span whose ID doesn't
-  exist, to aid in debugging issues with multiple subscribers ([#1483])
-- **registry**: Improved documentation on span ID generation ([#1453])
-
-[#1460]: https://github.com/tokio-rs/tracing/pull/1460
-[#1483]: https://github.com/tokio-rs/tracing/pull/1483
-[#1463]: https://github.com/tokio-rs/tracing/pull/1463
-[#1453]: https://github.com/tokio-rs/tracing/pull/1453
-[#1498]: https://github.com/tokio-rs/tracing/pull/1498
-
-Thanks to new contributors @joshtriplett and @lerouxrgd, and returning
-contributor @teozkr, for contributing to this release!
-
-# 0.2.19 (June 25, 2021)
-
-### Deprecated
-
-- **registry**: `SpanRef::parents`, `SpanRef::from_root`, and `Context::scope`
-  iterators, which are replaced by new `SpanRef::scope` and `Scope::from_root`
-  iterators ([#1413])
-
-### Added
-
-- **registry**: `SpanRef::scope` method, which returns a leaf-to-root `Iterator`
-  including the leaf span ([#1413])
-- **registry**: `Scope::from_root` method, which reverses the `scope` iterator
-  to iterate root-to-leaf ([#1413])
-- **registry**: `Context::event_span` method, which looks up the parent span of
-  an event ([#1434])
-- **registry**: `Context::event_scope` method, returning a `Scope` iterator over
-  the span scope of an event ([#1434])
-- **fmt**: `MakeWriter::make_writer_for` method, which allows returning a
-  different writer based on a span or event's metadata ([#1141])
-- **fmt**: `MakeWriterExt` trait, with `with_max_level`, `with_min_level`,
-  `with_filter`, `and`, and `or_else` combinators ([#1274])
-- **fmt**: `MakeWriter` implementation for `Arc<W> where &W: io::Write`
-  ([#1274])
-
-Thanks to @teozkr and @Folyd for contributing to this release!
-
-[#1413]: https://github.com/tokio-rs/tracing/pull/1413
-[#1434]: https://github.com/tokio-rs/tracing/pull/1434
-[#1141]: https://github.com/tokio-rs/tracing/pull/1141
-[#1274]: https://github.com/tokio-rs/tracing/pull/1274
-
-# 0.2.18 (April 30, 2021)
-
-### Deprecated
-
-- Deprecated the `CurrentSpan` type, which is inefficient and largely superseded
-  by the `registry` API ([#1321])
-
-### Fixed
-
-- **json**: Invalid JSON emitted for events in spans with no fields ([#1333])
-- **json**: Missing span data for synthesized new span, exit, and close events
-  ([#1334])
-- **fmt**: Extra space before log lines when timestamps are disabled ([#1355])
-
-### Added
-
-- **env-filter**: Support for filters on spans whose names contain any
-  characters other than `{` and `]` ([#1368])
-
-Thanks to @Folyd, and new contributors @akinnane and @aym-v for contributing to
-this release!
-
-[#1321]: https://github.com/tokio-rs/tracing/pull/1321
-[#1333]: https://github.com/tokio-rs/tracing/pull/1333
-[#1334]: https://github.com/tokio-rs/tracing/pull/1334
-[#1355]: https://github.com/tokio-rs/tracing/pull/1355
-[#1368]: https://github.com/tokio-rs/tracing/pull/1368
-
-# 0.2.17 (March 12, 2021)
-
-### Fixed
-
-- **fmt**: `Pretty` formatter now honors `with_ansi(false)` to disable ANSI
-  terminal formatting ([#1240])
-- **fmt**: Fixed extra padding when using `Pretty` formatter ([#1275])
-- **chrono**: Removed extra trailing space with `ChronoLocal` time formatter
-  ([#1103])
-
-### Added
-
-- **fmt**: Added `FmtContext::current_span()` method, returning the current span
-  ([#1290])
-- **fmt**: `FmtSpan` variants may now be combined using the `|` operator for
-  more granular control over what span events are generated ([#1277])
-
-Thanks to new contributors @cratelyn, @dignati, and @zicklag, as well as @Folyd,
-@matklad, and @najamelan, for contributing to this release!
-
-[#1240]: https://github.com/tokio-rs/tracing/pull/1240
-[#1275]: https://github.com/tokio-rs/tracing/pull/1275
-[#1103]: https://github.com/tokio-rs/tracing/pull/1103
-[#1290]: https://github.com/tokio-rs/tracing/pull/1290
-[#1277]: https://github.com/tokio-rs/tracing/pull/1277
-
-# 0.2.16 (February 19, 2021)
-
-### Fixed
-
-- **env-filter**: Fixed directives where the level is in mixed case (such as
-  `Info`) failing to parse ([#1126])
-- **fmt**: Fixed `fmt::Subscriber` not providing a max-level hint ([#1251])
-- `tracing-subscriber` no longer enables `tracing` and `tracing-core`'s default
-  features ([#1144])
-  
-### Changed
-
-- **chrono**: Updated `chrono` dependency to 0.4.16 ([#1189])
-- **log**: Updated `tracing-log` dependency to 0.1.2
-
-Thanks to @salewski, @taiki-e, @davidpdrsn and @markdingram for contributing to
-this release!
-
-[#1126]: https://github.com/tokio-rs/tracing/pull/1126
-[#1251]: https://github.com/tokio-rs/tracing/pull/1251
-[#1144]: https://github.com/tokio-rs/tracing/pull/1144
-[#1189]: https://github.com/tokio-rs/tracing/pull/1189
-
-# 0.2.15 (November 2, 2020)
-
-### Fixed
-
-- **fmt**: Fixed wrong lifetime parameters on `FormatFields` impl for
-  `FmtContext` ([#1082])
-
-### Added
-
-- **fmt**: `format::Pretty`, an aesthetically pleasing, human-readable event
-  formatter for local development and user-facing CLIs ([#1080])
-- **fmt**: `FmtContext::field_format`, which returns the subscriber's field
-  formatter ([#1082])
-
-[#1082]: https://github.com/tokio-rs/tracing/pull/1082
-[#1080]: https://github.com/tokio-rs/tracing/pull/1080
-
-# 0.2.14 (October 22, 2020)
-
-### Fixed
-
-- **registry**: Fixed `Registry::new` allocating an excessively large amount of
-  memory, most of which would never be used ([#1064])
-
-### Changed
-
-- **registry**: Improved `new_span` performance by reusing `HashMap` allocations
-  for `Extensions` ([#1064])
-- **registry**: Significantly improved the performance of `Registry::enter` and
-  `Registry::exit` ([#1058])
-
-[#1064]: https://github.com/tokio-rs/tracing/pull/1064
-[#1058]: https://github.com/tokio-rs/tracing/pull/1058
-
-# 0.2.13 (October 7, 2020)
-
-### Changed
-
-- Updated `tracing-core` to 0.1.17 ([#992])
-
-### Added
-
-- **env-filter**: Added support for filtering on targets which contain dashes
-  ([#1014])
-- **env-filter**: Added a warning when creating an `EnvFilter` that contains
-  directives that would enable a level disabled by the `tracing` crate's
-  `static_max_level` features ([#1021])
-
-Thanks to @jyn514 and @bkchr for contributing to this release!
-
-[#992]: https://github.com/tokio-rs/tracing/pull/992
-[#1014]: https://github.com/tokio-rs/tracing/pull/1014
-[#1021]: https://github.com/tokio-rs/tracing/pull/1021
-
-# 0.2.12 (September 11, 2020)
-
-### Fixed
-
-- **env-filter**: Fixed a regression where `Option<Level>` lost its
-  `Into<LevelFilter>` impl ([#966])
-- **env-filter**: Fixed `EnvFilter` enabling spans that should not be enabled
-  when multiple subscribers are in use ([#927])
-
-### Changed
-
-- **json**: `format::Json` now outputs fields in a more readable order ([#892])
-- Updated `tracing-core` dependency to 0.1.16
-
-### Added
-
-- **fmt**: Add `BoxMakeWriter` for erasing the type of a `MakeWriter`
-  implementation ([#958])
-- **fmt**: Add `TestWriter` `MakeWriter` implementation to support libtest
-  output capturing ([#938])
-- **layer**: Add `Layer` impl for `Option<T> where T: Layer` ([#910])
-- **env-filter**: Add `From<Level>` impl for `Directive` ([#918])
-- Multiple documentation fixes and improvements
-
-Thanks to @Pothulapati, @samrg472, @bryanburgers, @keetonian, and @SriRamanujam
-for contributing to this release!
-
-[#927]: https://github.com/tokio-rs/tracing/pull/927
-[#966]: https://github.com/tokio-rs/tracing/pull/966
-[#958]: https://github.com/tokio-rs/tracing/pull/958
-[#892]: https://github.com/tokio-rs/tracing/pull/892
-[#938]: https://github.com/tokio-rs/tracing/pull/938
-[#910]: https://github.com/tokio-rs/tracing/pull/910
-[#918]: https://github.com/tokio-rs/tracing/pull/918
-
-# 0.2.11 (August 10, 2020)
-
-### Fixed
-
-- **env-filter**: Incorrect max level hint when filters involving span field
-  values are in use (#907)
-- **registry**: Fixed inconsistent span stacks when multiple registries are in
-  use on the same thread (#901)
-
-### Changed
-
-- **env-filter**: `regex` dependency enables fewer unused feature flags (#899)
-
-Thanks to @bdonlan and @jeromegn for contributing to this release!
-
-# 0.2.10 (July 31, 2020)
-
-### Fixed
-
-- **docs**: Incorrect formatting (#862)
-
-### Changed
-
-- **filter**: `LevelFilter` is now a re-export of the
-  `tracing_core::LevelFilter` type, it can now be used interchangably with the
-  versions in `tracing` and `tracing-core` (#853)
-- **filter**: Significant performance improvements when comparing `LevelFilter`s
-  and `Level`s (#853)
-- Updated the minimum `tracing-core` dependency to 0.1.12 (#853)
-
-### Added
-
-- **filter**: `LevelFilter` and `EnvFilter` now participate in `tracing-core`'s
-  max level hinting, improving performance significantly in some use cases where
-  levels are disabled globally (#853)
-
-# 0.2.9 (July 23, 2020)
-
-### Fixed
-
-- **fmt**: Fixed compilation failure on MSRV when the `chrono` feature is
-  disabled (#844)
-
-### Added
-
-- **fmt**: Span lookup methods defined by `layer::Context` are now also provided
-  by `FmtContext` (#834)
-
-# 0.2.8 (July 17, 2020)
-
-### Changed
-
-- **fmt**: When the `chrono` dependency is enabled, the `SystemTime` timestamp
-  formatter now emits human-readable timestamps rather than using `SystemTime`'s
-  `fmt::Debug`implementation (`chrono` is still required for customized
-  timestamp formatting) (#807)
-- **ansi**: Updated `ansi_term` dependency to 0.12 (#816)
-
-### Added
-
-- **json**: `with_span_list` method to configure the JSON formatter to include a
-  list of all spans in the current trace in formatting events (similarly to the
-  text formatter) (#741) 
-- **json**: `with_current_span` method to configure the JSON formatter to include
-  a field for the _current_ span (the leaf of the trace) in formatted events
-  (#741)
-- **fmt**: `with_thread_names` and `with_thread_ids` methods to configure
-  `fmt::Subscriber`s and `fmt::Layer`s to include the thread name and/or thread ID
-  of the current thread when formatting events (#818)
-  
-Thanks to new contributors @mockersf, @keetonian, and @Pothulapati for
-contributing to this release!
-
-# 0.2.7 (July 1, 2020)
-
-### Changed
-
-- **parking_lot**: Updated the optional `parking_lot` dependency to accept the
-  latest `parking_lot` version (#774)
-
-### Fixed
-
-- **fmt**: Fixed events with explicitly overridden parent spans being formatted
-  as though they were children of the current span (#767)
-
-### Added
-
-- **fmt**: Added the option to print synthesized events when spans are created,
-  entered, exited, and closed, including span durations (#761)
-- Documentation clarification and improvement (#762, #769)
-
-Thanks to @rkuhn, @greenwoodcm, and @Ralith for contributing to this release!
-
-# 0.2.6 (June 19, 2020)
-
-### Fixed
-
-- **fmt**: Fixed an issue in the JSON formatter where using `Span::record` would
-  result in malformed spans (#709)
-
-# 0.2.5 (April 21, 2020)
-
-### Changed
-
-- **fmt**: Bump sharded-slab dependency (#679)
-
-### Fixed
-
-- **fmt**: remove trailing space in `ChronoUtc` `format_time` (#677)
-
-# 0.2.4 (April 6, 2020)
-
-This release includes several API ergonomics improvements, including shorthand
-constructors for many types, and an extension trait for initializing subscribers
-using method-chaining style. Additionally, several bugs in less commonly used
-`fmt` APIs were fixed.
-
-### Added
-
-- **fmt**: Shorthand free functions for constructing most types in `fmt`
-  (including `tracing_subscriber::fmt()` to return a `SubscriberBuilder`,
-  `tracing_subscriber::fmt::layer()` to return a format `Layer`, etc) (#660)
-- **registry**: Shorthand free function `tracing_subscriber::registry()` to
-  construct a new registry (#660)
-- Added `SubscriberInitExt` extension trait for more ergonomic subscriber
-  initialization (#660)
-  
-### Changed
-
-- **fmt**: Moved `LayerBuilder` methods to `Layer` (#655)
-
-### Deprecated
-
-- **fmt**: `LayerBuilder`, as `Layer` now implements all builder methods (#655)
-  
-### Fixed
-
-- **fmt**: Fixed `Compact` formatter not omitting levels with
-  `with_level(false)` (#657)
-- **fmt**: Fixed `fmt::Layer` duplicating the fields for a new span if another
-  layer has already formatted its fields (#634)
-- **fmt**: Added missing space when using `record` to add new fields to a span
-  that already has fields (#659)
-- Updated outdated documentation (#647)
-
-
-# 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