• Targeting .NET Standard 2.0 as minimum version (.NET Framework 4.6.1, .NET Core 2.0 and Mono 5.4)
• Added ASP.NET Core middlware
• Added possibility to signal a failed scrape from on-demand collectors
• Removed dependency on Reactive Extensions
• Minor breaking changes to API
• Performance improvements for hot-path code
• Removed mostly obsolete PerfCounterCollector class
• Fixed NuGet package contents to remove assemblies from dependencies
• Various minor fixes (see issues on GitHub for details)