Benchmark v0.5.7 - Backup

Version 0.5.7 - 2025-08-28

• Internal, zero-dependency histogram replaces hdrhistogram for the metrics feature.
• Lock-free hot path for recording; improved Watch::snapshot() internals.
• Documentation refreshed; clippy/rustfmt clean; no breaking API changes.
• TL;DR: Same API, faster internals, no extra deps.

Highlights

• Zero-dependency metrics: internal high-performance histogram replaces hdrhistogram.
• Lock-free hot path for recording metrics; improved snapshotting API.
• Documentation refreshed across README and API to reflect new metrics internals.

Added

• Changelog entry documenting histogram migration and zero-dependency metrics.

Changed

• Metrics feature now uses built-in, zero-dependency histogram (src/histogram.rs) instead of hdrhistogram.
• src/watch.rs: refactored to store Arc<Histogram> per metric; lock-free recording on the hot path; snapshot() moved to use internal API.
• Cargo.toml: removed hdrhistogram dependency and references from features; updated description; all feature now includes metrics.
• Documentation updates: README.md, docs/API.md, docs/features/METRICS.md now describe the internal histogram and production observability path.

Removed

• External dependency on hdrhistogram from the metrics feature (metrics is now zero-dependency).

Compatibility

• Public API for metrics is preserved: Watch, Timer, and stopwatch! continue to work as before.
• No code changes required for consumers, unless relying on hdrhistogram-specific behavior. Internal implementation is now native.

Upgrade Guide

• Update your dependency to:

  [dependencies]
  benchmark = "0.5.7"

• If you disable default features and use metrics, enable metrics explicitly:

  [dependencies]
  benchmark = { version = "0.5.7", default-features = false, features = ["std", "metrics"] }

• No migration actions are required for existing Watch/Timer/stopwatch! usage.

Quality & CI

• Clippy: clean under #![deny(clippy::all)] across all features.
• Rustfmt: formatted (CI enforces --check).
• Tests: unit, async, and feature-gated perf tests validated locally.

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Full Changelog: v0.5.0...v0.5.7