## 2.0.0 (April 25, 2018)

* [FEATURE] New SQL lexer to support a wider variety of SQL queries.
* [BREAKING] Drop support for Ruby versions prior to 2.2
* [BREAKING] Drop support for Rails versions prior to 4.2
* [BREAKING] Drop support for Tilt versions prior to 1.4.1
* [BREAKING] Drop support for Sinatra versions prior to 1.4
* [BREAKING] Drop support for Grape versions prior to 0.13.0
* [BREAKING] Drop support for Linux with glibc versions prior to 2.15
* [BREAKING] Remove couch_potato normalizer as it doesn't appear to have ever worked
* [BREAKING] `log_sql_parse_errors` config option is now on by default.
* [IMPROVEMENT] Auto-disable Middleware probe if it appears to be causing issues
* [IMPROVEMENT] More detailed logging and improved error handling
* [IMPROVEMENT] Fix Ruby Warnings (Thanks @amatsuda!)
* [IMPROVEMENT] Improved handling of errors generated in the Rust agent.
* [IMRPOVEMENT] Add logging to Instrumentable for easier access
* [IMPROVEMENT] Improved logging during startup

## 1.7.0 (April 24, 2018)

* [FEATURE] New API for loading Probes. Example: `Skylight.probe(:excon')`
* [FEATURE] New API for enabling non-default Normalizers. Example: `Skylight.enable_normalizer('active_job')`
* [DEPRECATION] Support for Rails versions prior to 4.2
* [DEPRECATION] Support for Tilt versions prior to 1.4.1
* [DEPRECATION] Support for Sinatra versions prior to 1.4
* [DEPRECATION] Support for Grape versions prior to 0.13.0

## 1.6.1 (April 12, 2018)

* [IMPROVEMENT] Include endpoint name in error logging
* [BUGFIX] Make sure to correctly release broken traces
* [BUGFIX] Keep the `require` method private when overwriting

## 1.6.0 (March 21, 2018)

* [FEATURE] Time spent the Rails router is now identified separately in the trace
* [IMPROVEMENT] Switch logger to debug mode if tracing is enabled
* [IMPROVEMENT] Improved logging for a number of error cases
* [IMPROVEMENT] Middleware probe should now accept anything allowed by Rack::Lint
* [IMPROVEMENT] We were using arity checks to determine Rails version but due to other libraries' monkey patches this could sometimes fail. We just check version numbers now.
* [BUGFIX] Middleware probe no longer errors when Middleware returns a frozen array

## 1.5.1 (February 7, 2018)

* [BUGFIX] `skylight doctor` no longer erroneously reports inability to reach Skylight servers.

## 1.5.0 (December 6, 2017)

* [FEATURE] [Coach](https://github.com/gocardless/coach) instrumentation. Enabled automatically via ActiveSupport::Notifications.
* [FEATURE] Option to enable or disable agent by setting SKYLIGHT_ENABLED via ENV.
* [IMPROVEMENT] Better logging for certain error cases.
* [BUGFIX] Backport a SPEC compliance fix for older Rack::ETag to resolve case where the Middleware probe could cause empty traces.
* [BUGFIX] Fix a case where using the non-block form of `Skylight.instrument` with `Skylight.done` could cause lost trace data.

## 1.4.4 (November 7, 2017)

* [BUGFIX] The minimum glibc requirement was errorneously bumped to 2.15. We have returned it to 2.5.

## 1.4.3 (October 18, 2017)

* [BUGFIX] In rare cases, Rails Middleware can be anonymous classes. We now handle those without raising an exception.

## 1.4.2 (October 11, 2017)

* [BUGFIX] For experimental deploy tracking support, resolve an error that occurred if the Git SHA and description were not set.

## 1.4.1 (October 10, 2017)

* [BUGFIX] Fix an issue that would prevent the daemon from starting up on FreeBSD.

## 1.4.0 (October 4, 2017)

* [FEATURE] Add probe for Rack Middlewares
* [FEATURE] ActiveRecord Instantiation instrumentation
* [FEATURE] Faraday instrumentation. Add 'faraday' to your probes list.
* [IMPROVEMENT] Increase limit for items tracked in a requests
* [IMPROVEMENT] Allow for more fine-grained control over position of Skylight::Middleware
* [IMPROVEMENT] Improved handling of the user-level configuration options
* [IMPROVEMENT] Avoid processing Skylight::Middleware unnecessarily
* [EXPERIMENTAL] FreeBSD support. (This should work automatically on FreeBSD systems, but real-world testing has been minimal.)
* [EXPERIMENTAL] ActionJob Enqueue instrumentation. (Only tracks the enqueuing of new jobs. Does not instrument jobs themselves. Off by default since it's not clear how useful it is. To enable: `require 'skylight/normalizers/active_job/enqueue_at'`.)

## 1.3.1 (May 17, 2017)

* [IMPROVEMENT] Better suggestions in `skylight doctor`.

## 1.3.0 (May 17, 2017)

* [FEATURE] Add normalizer for couch_potato. (Thanks @cobot)
* [IMPROVEMENT] `skylight doctor` now validates SSL configuration
* [IMPROVEMENT] Add ENV option to force use of bundled SSL certificates

## 1.2.2 (April 28, 2017)

* [BUGFIX] Update bundled SSL certificates to avoid an authentication issue some users encountered due to a new skylight.io certificate.

## 1.2.1 (April 20, 2017)

* [BUGFIX] Ignored heartbeat endpoints with response types weren't actually ignored. They now will be!

## 1.2.0 (April 10, 2017)

* [FEATURE] Response Type tracking for all applications. (Previously known as Segments.)

## 1.1.0 (March 9, 2017)

* [FEATURE] Support musl-based OSes (including Alpine Linux)
* [FEATURE] Add Elasticsearch Probe
* [FEATURE] Add HTTPClient probe (#76)j
* [IMPROVEMENT] Update tested Ruby versions, drop 1.9.2
* [BUGFIX] Fix HTTP_PROXY handling of empty strings (#90)
* [BUGFIX] Don't crash on empty content_type strings
* [BUGFIX] Use more robust method to detect home dir (#75)
* [BUGFIX] Add option to suppress environment warning (#62)

## 1.0.1 (November 15, 2016)

* [BUGFIX] Gracefully handle non-writable log files
* [BUGFIX] Fix skylight doctor's handling of config files
* [BUGFIX] Support MetalControllers that don't use ActionController::Rendering

## 1.0.0 (October 19, 2016)

* [BETA FEATURE] Track separate segments for endpoints. Contact support@skylight.io to have this feature enabled for your account.
* [FEATURE] Initial 'skylight doctor' command
* [BREAKING] Removed old `skylight setup` without creation token
* [BREAKING] Remove Ruby based SQL lexer
* [IMPROVEMENT] Internal refactors
* [BUGFIX] Correctly pass 'false' config values to Rust agent

## 0.10.6 (August 10, 2016)

* [BUGFIX] Turn off -Werror and -pedantic for builds. [Issue #64](https://github.com/skylightio/skylight-ruby/issues/64)

## 0.10.5 (June 22, 2016)

* [BUGFIX] Fix issue with Grape multi-method naming
* [BUGFIX] Add http to proxy_url for native fetching
* [BUGFIX] Fix setting `proxy_url` in config YML
* [IMPROVEMENT] Log errors during authentication validation

## 0.10.4 (June 3, 2016)

* [BUGFIX] Sinatra instrumenation now works for latest master
* [BUGFIX] Sequel support for 4.35.0
* [BUGFIX] Handle latest ActiveModel::Serializers version
* [BUGFIX] More precise check for existence of Rails
* [BREAKING] Drop official support for Sinatra 1.2 (it likely never worked correctly)
* [IMPROVEMENT] On Heroku, logs are now written to STDOUT
* [IMPROVEMENT] Allow Skylight to raise on logged errors, useful for testing and debugging
* [IMPROVEMENT] Finish Rack::Responses in Middleware
* [IMRPOVEMENT] Better message when config/skylight.yml already exists
* [IMPROVEMENT] Update Rust Agent with SQL improvements, including handling for arrays and WITH

## 0.10.3 (February 2, 2016)

* [BUGFIX] Don't validate configuration on disabled environments.

## 0.10.2 (January 19, 2016)

* [BUGFIX] Fix git repository warning on startup. [Issue #58](https://github.com/skylightio/skylight-ruby/issues/58)

## 0.10.1 (January 4, 2016) [YANKED]

* [FEATURE] Preliminary work for deploy tracking (not yet functional)
* [BUGFIX] Don't crash if user config (~/.skylight) is empty
* [BUGFIX] Better handling of unsupported moped versions
* [IMPROVEMENT] Internal refactor of configuration handling
* [IMPROVEMENT] Improve automated tests
* [IMPROVEMENT] Fix tests in Rails 5 (No actual code changes required!)

## 0.10.0 (December 3, 2015)

* [FEATURE] ActiveModel::Serializers Instrumentation. Always on in latest HEAD, for previous version add 'active_model_serializers' to probes list.
* [BUGFIX] Handle multi-byte characters in SQL lexer

## 0.9.4 (November 23, 2015)

* [FEATURE] Added instrumentation for official Mongo Ruby Driver (utilized by Mongoid 5+). Add 'mongo' to probes list to enable.
* [BUGFIX] SQL lexer now handles indentifiers beginning with underscores.
* [BUGFIX] Excon instrumentation now works correctly.
* [BUGFIX] Graceful handling of native agent failures on old OS X versions.
* [IMPROVEMENT] Freeze some more strings for (likely very minor) performance improvements.
* [IMPROVEMENT] Better error messages when sockdir is an NFS mount.
* [IMPROVEMENT] On OS X, ensure that Xcode license has been approved before trying to build native agent.

## 0.9.3 (November 17, 2015)

* [BUGFIX] Update SQL lexer to handle more common queries
* [BUGFIX] Correctly report native gem installation failures

## 0.9.2 (November 13, 2015)

* [BUGFIX] Correctly update Rust agent to include SQL fixes that were supposed to land in 0.9.1.

## 0.9.1 (November 10, 2015)

* [BUGFIX] Update Rust SQL lexer to handle `NOT` and `::` typecasting.

## 0.9.0 (November 6, 2015)

* [FEATURE] Expose Skylight::Helpers.instrument_class_method
* [BUGFIX] Allow for instrumentation of setters
* [BUGFIX] Fix an issue where loading some items in the Grape namespace without loading the whole library would cause an exception.
* [IMPROVEMENT] Switch to Rust SQL lexer by default
* [IMPROVEMENT] Add support for Redis pipelined and multi
* [IMPROVEMENT] Updated Rust internals
* [IMPROVEMENT] Agent should now work on current Rails master
* [IMPROVEMENT] Better disabling of development mode warning

## 0.8.1 (October 1, 2015)

* [BUGFIX] Fix agent on OS X El Capitan.
* [PERFORMANCE] Explicitly subscribe to normalized events
* [IMPROVEMENT] Use native unique description tracking
* [IMPROVEMENT] Native SQL: Support multistatement queries

## 0.8.0 (August 13, 2015)

* [FEATURE] Add Grape instumentation. See http://docs.skylight.io/grape
* [FEATURE] Process ERB in config/skylight.yml
* [FEATURE] Add Rust based SQL lexing. Currently beta. Enable with `config.sql_mode = 'rust'`.
* [BUGFIX] Fixed a case where, With some logger configurations, duplicate messages could be written to STDOUT.

## 0.7.1 (August 4, 2015)

* [BUGFIX] Fix bug in FFI error handling

## 0.7.0 (August 3, 2015)

* [BUFIX] Condvar bug in Rust. Updated to latest nightly.
* [BUGFIX] Don't crash on ruby stack overflow
* [IMPROVEMENT] Silence a noisy log message
* [IMPROVEMENT] Update to latest openssl & curl
* [FEATURE] Add probe on ActionView for layout renders

## 0.6.1 (June 30, 2015)

* [BUGFIX] Don't use $DEBUG to enable verbose internal logging

## 0.6.0 (January 27, 2015)

* [IMPROVEMENT] Eliminates runtime dependency on the Rails
  constant across the entire codebase
* [FEATURE] Support for Sinatra applications. See http://docs.skylight.io/sinatra/
* [FEATURE] Support for the Sequel ORM (off by default for Rails apps)
* [FEATURE] Support for Tilt templates (off by default for Rails apps)

## 0.5.2 (December 15, 2014)

* [IMPROVEMENT] Support ignoring multiple heartbeat endpoints
* [BUGFIX] Fix compilation errors on old GCC

## 0.5.1 (December 5, 2014)

* [BUGFIX] Fix issues with working directory dissappearing

## 0.5.0 (December 4, 2014)
* [IMPROVEMENT] Automatically load configuration from ENV
* [FEATURE] Track object allocations per span
* [IMPROVEMENT] Fix C warnings

## 0.4.3 (November 17, 2014)

* [BUGFIX] Fix Moped integration when queries include times

## 0.4.2 (November 12, 2014)

* [BUGFIX] Fix exit status on MRI 1.9.2
* [BUGFIX] Strip SQL comments for better aggregation

## 0.4.1 (November 7, 2014)

* [BUGFIX] Fix downloading native agent on 32bit systems
* [BUGFIX] Support legacy config settings
* [FEATURE] Check FS permissions on instrumenter start

## 0.4.0 (November 3, 2014)

* Featherweight Agent: lowered CPU and memory overhead
* [IMPROVEMENT] Add support for ignoring an endpoint by name

## 0.3.21 (October 8, 2014)

* [BUGFIX] Skylight crashing on start won't crash entire app

## 0.3.20 (September 3, 2014)

* [BUGFIX] Fix app name fetching on Windows for `skylight setup`

## 0.3.19 (July 30, 2014)

* [IMPROVEMENT] HEAD requests are no longer instrumented and will not count towards usage totals.
* [IMPROVEMENT] Added LICENSE and CLA
* [IMPROVEMENT] Improve how warnings are logged to reduce overall noise and interfere less with cron jobs
* [BUGFIX] Fixed a case where failed app creation raised an exception instead of printing error messages

## 0.3.18 (July 17, 2014)

* [FEATURE] Redis probe (Not enabled by default. See http://docs.skylight.io/agent/#railtie)
* [FEATURE] Support app creation with token instead of email/password
* [BUGFIX] App creation now works even when Webmock is enabled
* [BUGFIX] Fix instrumentation for methods ending in special chars
* [BUGFIX] Improved SQL parsing
* [IMPROVEMENT] Respect collector token expiration to reduce token requests

## 0.3.17 (July 1, 2014)

* Fix warning for Cache.instrument overwrite

## 0.3.16 (July 1, 2014) [YANKED]

* Fixed ActiveSupport::Cache monkeypatch

## 0.3.15 (June 30, 2014) [YANKED]

* Basic instrumentation for ActiveSupport::Cache
* Fix incompatibility with old version of rack-mini-profiler
* Better error messages when config/skylight.yml is invalid
* Better error messages for non-writeable lock/sockfile path

## 0.3.14 (June 3, 2014)

* Do not build C extension if dependencies (libraries/headers) are
  missing
* [RUST] Improve performance by not double copying memory when serializing
* Enable the Net::HTTP probe by default

## 0.3.13 (May 12, 2014)

* Load probes even when agent is disabled
* Check for Excon::Middlewares before installing the probe
* SQL error encoder should not operate in-place
* Fix Middleware
* More debug logging
* Log Rails version in MetricsReporter
* Handle missing Net::ReadTimeout in 1.9.3
* Include original exception information in sql_parse errors
* Debugging for failed application creation
* Make double sure that Trace started_at is an Integer

## 0.3.12 (April 17, 2014)

* Include more information in type check errors
* Use stdlib SecureRandom instead of ActiveSupport::SecureRandom - Fixes Rails 3.1
* Instrumenter#start! should fail if worker not spawned
* Configurable timeouts for Util::HTTP
* Improve proxy handling for Util::HTTP
* Improve HTTP error handling
* Refactor sql_parse errors

## 0.3.11 (April 11, 2014)

* Improved error handling and internal metrics
* Improved missing native agent message
* Improved install logging
* Added initial inline docs
* Respects HTTP_PROXY env var during installation
* Don't overwrite sockfile_path if set explicitly

## 0.3.10 (April 8, 2014)

* Don't raise on missing native agent path

## 0.3.9 (April 8, 2014)

* Avoid finalizing sockets in the child process
* Fix non-displaying warnings around native agent
* Remove HTTP path information from title for better grouping

## 0.3.8 (April 3, 2014)

* Update vendored highline to 1.6.21
* Send more information with exceptions for easier debugging
* Instrument and report internal agent metrics for easier debugging
* Fix bug with tracking request counts per endpoint

## 0.3.7 (March 31, 2014)

* Use a default event category if none passed to Skylight.instrument
* Fix bugs around disabling the agent
* Fix native extension compilation bugs

## 0.3.6 (March 27, 2014)

* Shorter token validation timeout
* Allow validation to be skipped

## 0.3.5 (March 26, 2014)

* Update Rust component
* Return true from Task#handle to avoid sutdown
* Fix numeric check that caused crash on some 32-bit systems
* Improve error message for missing Skylight ext
* Better config error messages
* Validate authentication token before starting
* Add proxy support

## 0.3.4 (March 13, 2014)

* Don't try to boot Skylight without native agent
* Make exception classes always available
* CLI should require railtie before loading application.rb

## 0.3.3 (March 12, 2014)

* Load the railtie even without native agent

## 0.3.2 (March 11, 2014)

* Autoload Skylight:Helpers even when native agent isn't available
* Fix SEGV

## 0.3.1 (March 8, 2014)

* Fix requires to allow CLI to function without native extension.

## 0.3.0 (February 28, 2014)

* Native Rust agent
* Send exceptions occurring during HTTP requests to the client.
* Warn users when skylight is potentially disabled incorrectly.
* Update SQL Lexer to 0.0.6
* Log the backtraces of unhandled exceptions
* Add support for disabling GC tracking
* Add support for disabling agent

## 0.2.7 (February 26, 2014)

* Disable annotations to reduce memory load.

## 0.2.6 (February 25, 2014)

* `inspect` even whitelisted payload props
* Ignore Errno::EINTR for 'ps' call

## 0.2.5 (February 21, 2014)

* Revert "Update SqlLexer to 0.0.4"

## 0.2.4 (February 20, 2014)

* Whitelist process action annotation keys.
* Update SqlLexer to 0.0.4

## 0.2.3 (December 20, 2013)

* Fix SQL lexing for comments, arrays, double-colon casting, and multiple queries
* Handle template paths from gems
* Status and exception reports for agent debugging

## 0.2.2 (December 10, 2013)

* Added support for Mongoid/Moped
* Fix probe enabling
* Improved error reporting
* Fix bug with multiple subscribers to same notification

## 0.2.1 (December 4, 2013)

* Fix bin/skylight

## 0.2.0 (December 3, 2013)

* Added Probes, initially Net::HTTP and Excon
* Wide-ranging memory cleanup
* Better resiliance to binary and encoding errors
* Add support for disabling
* De-dupe rendering instrumentation better
* Fix send_file event to not spew a gazillion nodes
* Rails 3.0 compatibility
* Detailed SQL annotations

## 0.1.8 (July 19, 2013)

* Update agent for new authentication scheme
* Change ENV variable prefix from SK_ to SKYLIGHT_

## 0.1.7 (July 11, 2013)

* Add instrument_method helper
* Add the ability to configure logging from railtie
* Tracks the current host
* [BUG] Handle AS::N monkey patching when there are already subscribers
* [BUG] Handle ruby 1.9.2 encoding bug

## 0.1.6 (June 11, 2013)

* [BUG] Fix unix domain socket write function in standalone agent
* Performance improvements
* Tolerate invalid trace building
* Fix Skylight on Rails 4

## 0.1.5 (May 31, 2013)

* Provide a default CA cert when one is not already present
* Expose Skylight.start! and Skylight.trace as APIs
* Expose Skylight.instrument as an API for custom instrumentation.

## 0.1.4 (May 30, 2013)

* [BUG] Fix some errors caused by floating point rounding
* [BUG] Handle clock skew caused by system clock changes

## 0.1.3 (May 29, 2013)

* [BUG] Require net/https and openssl
* [BUG] Rails' logger does not respond to #log. Use level methods
  instead

## 0.1.2 (May 29, 2013)

* [BUG] Disable GC profiling on JRuby

## 0.1.1 (May 29, 2013)

* [BUG] GC Profiling was not getting enabled

## 0.1.0 (May 24, 2013)

* Initial release