Add changelog

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+---
+
+## [Unreleased]
+
+### Added
+-
+
+### Changed
+-
+
+### Deprecated
+-
+
+### Removed
+-
+
+### Fixed
+-
+
+### Security
+-
+
+---
+
+## [0.4.1](https://github.com/autometrics-dev/autometrics-rs/releases/tag/v0.4.1) - 2023-05-05
+
+### Changed
+
+- Overhaul documentation
+
+### Fixed
+
+- Generated latency query needs additional labels to show lines for 95th and 99th percentiles
+
+## [0.4.0](https://github.com/autometrics-dev/autometrics-rs/releases/tag/v0.4.0) - 2023-04-26
+
+### Added
+
+- `build_info` metric tracks software version and commit
+- Queries now use `build_info` metric to correlate version info with problems
+
+### Fixed
+
+- Prometheus rules handle when the counter metric name has a `_total` suffix
+
+## [0.3.3](https://github.com/autometrics-dev/autometrics-rs/releases/tag/v0.3.3) - 2023-04-14
+
+### Added
+
+- Alerts have minimum traffic threshold of 1 request / minute
+
+### Fixed
+
+- Latency SLO total query in alerting rules
+
+## [0.3.1](https://github.com/autometrics-dev/autometrics-rs/releases/tag/v0.3.1) - 2023-03-21
+
+### Added
+
+- `custom-objective-latency` and `custom-objective-percentile` feature flags
+
+### Changed
+
+- Use the OpenTelemetry default histogram buckets
+
+### Removed
+
+- Remove the latency objective values for 150, 200, and 350 milliseconds
+- `custom-objectives` feature flag
+
+## [0.3.0](https://github.com/autometrics-dev/autometrics-rs/releases/tag/v0.3.0) - 2023-03-14
+
+### Added
+
+- Support defining Service-Level Objectives (SLOs) in code
+- CLI to generate Sloth file, which is then used to generate Prometheus alerting rules
+- `#[skip_autometrics]` annotation when applying autometrics to an `impl` block
+- `ok_if` and `error_if` autometrics parameters
+
+## [0.2.4](https://github.com/autometrics-dev/autometrics-rs/releases/tag/v0.2.4) - 2023-02-08
+
+### Fixed
+
+- Histogram buckets
+
+
+## [0.2.3](https://github.com/autometrics-dev/autometrics-rs/releases/tag/v0.2.3) - 2023-01-31
+
+### Fixed
+
+- Building of documentation on docs.rs
+
+## [0.2.0](https://github.com/autometrics-dev/autometrics-rs/releases/tag/v0.2.0) - 2023-01-31
+
+### Added
+
+- Support `opentelemetry` and `metrics` crates for tracking metrics
+- Support applying autometrics to an `impl` block
+
+### Changed
+
+- Tracking function concurrency is optional
+
+## [0.1.1](https://github.com/autometrics-dev/autometrics-rs/releases/tag/v0.1.1) - 2023-01-27
+
+### Added
+
+- Track concurrent requests
+- Add return types as labels
+- Separate function call counter
+- `caller` label
+
+### Changed
+
+- Use OpenTelemetry metric naming conventions