Libraries work to support Cloud Native effort for .NET 9

[tarekgh]

OpenTelemetry

• Add "hints" in Metric API to provide things like histogram bounds #63650
• Activity should have AddExceptionMethod #53641
• [Feature Request]: Add synchronous gauge instrument #92625
• Support adding links to Activity after it is created #97680

Logging

• [API Proposal]: Introducing Log buffering abstraction #104129

Metrics

• Metrics for System.Runtime #85372
• Introducing Environment.ProcessorUserTime & ProcessorPrivilegedTime  #104844
• [Feature request]: Support instrumentation scope attributes on ActivitySource #93795

MetricsEventSource

• MetricEventSource value published events don't unambiguously resolve which Meter and Instrument tags they are refering to #93767
• MetricEventSource value published events don't resolve which scope they are refering to #93097

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Future Issues

MetricsEventSource

• [Feature Request] Faster aggregation for the MetricsEventSource under concurrency #71563

Logging

• Logging AddSimpleConsole should allow for trimming Json and Systemd formatters #85116
• [Feature Request]: Better ILogger sampling and filtering #82465
• Integrate ConsoleLogExporter functionality from dotnet/extensions #87250

Logging Source Gen

Consolidating all source gen work for logging, options, and configuration - L

• Logging source generator reruns code generation phase on keypress. #93309
• Improve LoggerMessageGenerator incrementality #76119
• LoggerMessageGenerator optimizations #91178

Analyzers

• [Analyzer] Usage of ToString in logging source generator method call sites #78402
• [Analyzer] Replacing direct LoggerExtensions.Log* usage with source-generated logging methods #78406

[ericstj]

@tarekgh should we close this and move some of the future work into a 10.0 issue?