# Changelog
## 0.10.0
- Improvement: Use different generic parameters for name and help at metric construction (#324).
- Bug fix: Error instead of panic when constructing histogram with unequal label key and label value length (#326).
- Bug fix: Return `Error::AlreadyReg` on duplicate collector registration (#333).
- Bug fix: Make Histogram::observe atomic across collects (#314).
- Internal change: Replace spin with parking_lot (#318).
- Internal change: Optimize metric formatting (#327).
- Internal change: Update parking_lot and procfs dependencies (#337).
## 0.9.0
- Add: Implement `encode` function for summary type metrics.
## 0.8.0
- Add: Reset Counters (#261)
- Add: Discard Histogram timers (#257)
- Add: `observe_closure_duration` for better observing closure duration for local histogram (#296)
- Fix a bug that global labels are not handled correctly (#269)
- Improve linear bucket accuracy by avoiding accumulating error (#276)
- Internal change: Use [thiserror](https://docs.rs/thiserror) to generate the error structure (#285)
- Internal change: Switch from procinfo to [procfs](https://docs.rs/procfs) (#290)
- Internal change: Update to newer dependencies
## 0.7.0
- Provide immutable interface for local counters.
## 0.6.1
- Fix compile error when ProtoBuf feature is not enabled (#240).
## 0.6.0
- Add: Expose the default registry (#231).
- Add: Support common namespace prefix and common labels (#233).
## 0.5.0
- Change: Added TLS and BasicAuthentication support to `push` client.
## 0.4.2
- Change: Update to use protobuf 2.0.
## 0.4.1
- Change: `(Local)(Int)Counter.inc_by` only panics in debug build if the given value is < 0 (#168).
## 0.4.0
- Add: Provides `IntCounter`, `IntCounterVec`, `IntGauge`, `IntGaugeVec`, `LocalIntCounter`, `LocalIntCounterVec` for better performance when metric values are all integers (#158).
- Change: When the given value is < 0, `(Local)Counter.inc_by` no longer return errors, instead it will panic (#156).
- Improve performance (#161).