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v8.0.0 - OpenMetrics, exemplars, performance optimizations and bugfixes

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@sandersaares sandersaares released this 17 Feb 06:03
· 121 commits to master since this release
  • Added OpenMetrics exposition format support (#388).
  • Added exemplar support for Counter and Histogram (#388).
  • The ':' character is no longer allowed in metric or label names. For metric names, Prometheus standard practice is to use colon only in recording rules.
  • Publish symbol packages and add Source Link support for easier debugging experience.
  • Fix defect where metrics with different labels could overwrite each other in specific circumstances with multiple metric factories in use (#389).
  • Ensure even harder that MetricPusher flushes the final state before stopping (#383 and #384)
  • Simplify DotNetStats built-in collector code for ease of readability and more best practices (#365, #364)
  • Slightly improve Counter performance under concurrent load.
  • Reduce memory allocations performed during ASP.NET Core HTTP request tracking.
  • By default, EventCounterAdapter will only listen to a small predefined set of general-purpose useful event sources, to minimize resource consumption in the default configuration. A custom event source filter must now be provided to enable listening for additional event sources.
  • EventCounterAdapter will only refresh data every 10 seconds by default, to reduce amount of garbage generated in memory (.NET event counters are very noisy and create many temporary objects).
  • Added IManagedLifetimeMetricFactory.WithLabels() to enable simpler label enrichment in scenarios where lifetime-managed metric instances are used.
  • Added back .NET Standard 2.0 support as some customers had a hard dependency on .NET Standard 2.0 (despite not being a documented feature even earlier).
  • Added (Observable)UpDownCounter support to MeterAdapter (.NET 7 specific feature).