API diff between .NET 8 and .NET 9

[carlossanlop]

Repo area owners:

• ASP.NET - @dotnet/aspnet-api-review
• WinForms - @merriemcgaw @lonitra @JeremyKuhne
• WPF - @singhashish-wpf and @pchaurasia14
• Libraries - @artl93 @jeffschwMSFT @jeffhandley @karelz @ericstj @stephentoub @SamMonoRT

Libraries area owners:

• System @dotnet/area-system-runtime
• System.Buffers @dotnet/area-system-buffers
• System.CodeDom @dotnet/area-system-codedom
• System.Collections @dotnet/area-system-collections
• System.ComponentModel @dotnet/area-system-componentmodel
• System.Data @SamMonoRT @ajcvickers @roji
• System.Diagnostics @dotnet/area-system-diagnostics
• System.Diagnostics.Metrics @dotnet/area-system-diagnostics-metric
• System.Drawing @dotnet/area-system-drawing @JeremyKuhne
• System.Formats.Asn1 @dotnet/area-system-formats-asn1
• System.Formats.Nrbf @dotnet/area-system-formats-nrbf
• System.Formats.Tar @dotnet/area-system-formats-tar
• System.IO @dotnet/area-system-io
• System.IO.Compression @dotnet/area-system-io-compression
• System.IO.Pipelines @adityamandaleeka @davidfowl @halter73
• System.IO.Pipes @dotnet/area-system-io
• System.IO.Ports @dotnet/area-system-io-ports
• System.Linq @dotnet/area-system-linq
• System.Management @dotnet/area-system-management
• System.Memory @dotnet/area-system-memory
• System.Net @dotnet/ncl
• System.Numerics @dotnet/area-system-numerics @dotnet/area-system-numerics-tensors
• System.Reflection @dotnet/area-system-reflection @dotnet/area-system-reflection-emit @dotnet/area-system-reflection-metadata
• System.Runtime.CompilerServices @dotnet/area-system-runtime-compilerservices
• System.Runtime.InteropServices @dotnet/interop-contrib
• System.Runtime.Intrinsics @dotnet/area-system-runtime-intrinsics
• System.Security @dotnet/area-system-security
• System.Text @dotnet/area-system-text-encoding
• System.Text.Json @dotnet/area-system-text-json
• System.Threading @dotnet/area-system-threading-channels @dotnet/area-system-threading-tasks @kouvel @mangod9
• System.Timers @dotnet/area-system-runtime

Known api-diff tool issues:

If yo usee any of these, please provide a GitHub suggestion in this PR to correct it:

• The AsmDiff tool sometimes skips adding { or {} arcade#10981([AsmDiff] For attributes, move the +/- diff symbol to the attribute instead of the affected API arcade#13814)
• RequiresPreviewAttribute not getting auto added arcade#14498
• Changes to protected internal visibility should stop showing. AsmDiff: Do not show APIs with protected internal visibility arcade#14579
• The AsmDiff tool shows APIs with decorating attribute changes as removed and re-added, instead of showing only the API. Please ignore this, it might be confusing but technically it's not incorrect: [arcade#13814]

[roji]

Approved for System.Data (SqlDbType.Json)

[bartonjs]

• System.Formats.Asn1 LGTM
• System.Security.* LGTM

[tarekgh]

I don't think this has changed

https://github.com/dotnet/runtime/blob/c1ae962610643a3c17bcf9621017ac42ff7703f7/src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/Metrics/MeterListener.cs#L12

[tarekgh]

I added some comments, LGTM otherwise:

• System.Diagnostics (Activity and ActivitySource)
• System.Diagnostics.Meterics
• System.Environment.CpuUsage/ProcessCpuUsage
• System.TimeSpan
• Microsoft.Extensions.Logging.Abstractions.BufferedLogRecord/IBufferedLogger

[eiriktsarpalis]

Linq, collections and STJ LGTM