Merge pull request prometheus#179 from prometheus/v2_0

Release v2.0

Version 1.0.0

Version 0.11.0.pre.alpha.1

Version 0.10.0

Version 0.10.0.pre.alpha.2

Version 0.10.0.pre.alpha.1

v0.9.0 / 2019-01-25

- [ENHANCEMENT] Support new pushgateway API prometheus#102
- [ENHANCEMENT] Provide more details in InvalidLabelSetError messages prometheus#89

v0.8.0 / 2018-05-04

- [FEATURE] Add increment/decrement methods to gauges
- [FEATURE] Add unregister method to registry
- [FEATURE] Support basic auth on pushgateways
- [ENHANCEMENT] Add option to set metrics prefix on collector middleware
- [ENHANCEMENT] Normalize paths with numeric IDs and UUIds
- [ENHANCEMENT] Make push client calls thread-safe
- [ENHANCEMENT] Increase precision of duration metrics in collector middleware
- [BUGFIX] Update quantile dependency to fix incorrect calculation

v0.7.1 / 2017-05-24

- [BUGFIX] Add missing _bucket suffix to histogram metrics

v0.7.0

- [CHANGE] Rewrite Rack middlewares
  - Renamed middlewares to Prometheus::Middleware::*
  - Collector uses histogram instead of summary
  - Adjusted Collector metrics to adhere to our best practices
  - Reduced Collector label cardinality by default
  - See prometheus#32
- [FEATURE] Add support for pushgateway deletes
- [FEATURE] Allow pushing metrics via TLS
- [ENHANCEMENT] Improve example application and docs
- [ENHANCEMENT] Remove extra Proc allocation from metrics sync
- [BUGFIX] Handle setting a gauge value to nil
- [BUGFIX] Validate metric name format