Sourced from prometheus-net.AspNetCore's releases.

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

• 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).

Sourced from prometheus-net.AspNetCore's changelog.

• 8.0.0

• 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.

• 7.1.0

• 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).

• a055f5b Disambiguate osme overloads
• 17e7c0f Add back missing overload of CollectAndExportAsTextAsync
• a7c1277 MeterAdapter and EventCounterAdapter will only start the default listener onc...
• c35ac64 Fix timestamp math to use floating point division
• 4f8f59c We cannot record an exemplar every time we record an exemplar!
• baa6eb0 Fix bug: Exemplar.None was passed in some overloads when null (==default) was...
• f61e5d4 User low granularity time source for faster timestamping peformance
• 0424d27 Mark in-parameters as such
• afcc03c Minor speedup by using non-constant-time comparison for exemplar labels
• 2f1b711 Benchmark expansion
• Additional commits viewable in compare view

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