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@sanych-sun sanych-sun released this 27 Apr 00:11
3.0.0
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phnx47 Serge K
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Learn about vigilant mode.
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phnx47 Serge K
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Learn about vigilant mode.

This major release dedicated mostly to reduce memory allocation especially while scrape collection to achieve this we made number of improvements and breaking changes.

Improvements:

  • Introduced IMetricsWriter, which used to produce metric samples without creation of CMetricFamily.
  • Added target to netcore2.2 which allow us to use non-allocating format methods. This dramatically reduces allocation while scrapping for application run on netcore2.2.
  • ICollectorRegistry and ICollector interfaces were reviewed.
  • Histogram and Summary now expose current state through Value property (which returns snapshot of the state).
  • Added CounterInt64 - counter optimized for integer values. It uses atomic operations instead of optimistic lock on value increment.
  • Added IValueObserver abstraction for Histogram and Summary, together with extension methods for convenient duration observation.
  • All value observation methods now support explicit setting timestamp for the observation.
  • Fluent syntax to register default collectors into the CollectorRegistry.
  • Reviewed MetricFactory to avoid unnecessary metric creation before checking CollectorRegistry for existing one.
  • Improved unit tests coverage and added benchmarks.
  • Library is Strong Named now.

Breaking changes:

  • Legacy .Net Framework 4.5 is not supported anymore.
  • Removed PerfCounter collectors as a platform dependent feature.
  • Removed all Contracts because of moving to IMetricsWriter.
  • TextFormatter was removed in favor of MetricsTextWriter.
  • CollectorRegistry.Instance was moved into Metrics.DefaultCollectorRegistry to isolate all static API into Metrics entry point.
  • Base classes Collector and Labelled have lots of changes to correspond new API and reduce allocation.
  • IOnDemandCollector was removed in favor of ICollector.
  • ScrapeHandler.Process methods is async now to follow .NET Core 3.0 synchronous operations restrictions.
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