[MEAI] Rename telemetry source from Experimental.Microsoft.Extensions.AI to Microsoft.Extensions.AI

[Copilot]

This change removes the "Experimental" prefix from the default telemetry source name for Microsoft.Extensions.AI, changing it from "Experimental.Microsoft.Extensions.AI" to "Microsoft.Extensions.AI".

Background

The issue raised a concern that keeping "Experimental" in the telemetry source name indefinitely could cause breaking changes in the future. The longer the experimental name stays in use, the more pain there will be when changing it later, as libraries and applications that depend on it (like Aspire integrations) would break if the source name changes without corresponding updates.

Changes Made

• Updated the DefaultSourceName constant in OpenTelemetryConsts.cs
• Updated hardcoded references in project templates and test snapshots
• Ensured all telemetry collection configurations use the new source name

Impact

This affects applications that use the default telemetry source name when creating:

• OpenTelemetryChatClient instances without a custom sourceName parameter
• OpenTelemetryEmbeddingGenerator<TInput, TEmbedding> instances without a custom sourceName parameter

Applications that provide a custom source name remain unaffected. Telemetry collection systems that previously monitored "Experimental.Microsoft.Extensions.AI" will need to be updated to monitor "Microsoft.Extensions.AI".

Example

// Before: Uses "Experimental.Microsoft.Extensions.AI" as default source name
var client = new OpenTelemetryChatClient(innerClient);

// After: Uses "Microsoft.Extensions.AI" as default source name  
var client = new OpenTelemetryChatClient(innerClient);

// Custom source names continue to work as before
var client = new OpenTelemetryChatClient(innerClient, logger, "MyCustomSource");

Fixes #6736.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• sqdvsblobprodcus333.vsblob.vsassets.io
  • Triggering command: /home/REDACTED/work/extensions/extensions/.dotnet/dotnet msbuild /m /nologo /clp:Summary /v:minimal /nr:true /p:TreatWarningsAsErrors=false /p:ContinuousIntegrationBuild=false /home/REDACTED/work/extensions/extensions/artifacts/toolset/restore.proj /t:__WriteToolsetLocation /clp:ErrorsOnly;NoSummary /p:__ToolsetLocationOutputFile=/home/REDACTED/work/extensions/extensions/artifacts/toolset/9.0.0-beta.25415.3.txt (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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Microsoft Reviewers: Open in CodeFlow

[Copilot]

Pull Request Overview

This PR removes the "Experimental" prefix from the default telemetry source name for Microsoft.Extensions.AI, changing it from "Experimental.Microsoft.Extensions.AI" to "Microsoft.Extensions.AI" to prevent future breaking changes as the library moves out of experimental status.

• Updates the core constant definition in OpenTelemetryConsts.cs
• Updates all project template references to use the new source name
• Updates test snapshots to reflect the new telemetry source name

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/Libraries/Microsoft.Extensions.AI/OpenTelemetryConsts.cs	Updates the DefaultSourceName constant definition
src/ProjectTemplates/Microsoft.Extensions.AI.Templates/src/ChatWithCustomData/ChatWithCustomData-CSharp.ServiceDefaults/Extensions.cs	Updates telemetry configuration in project template
test/ProjectTemplates/Microsoft.Extensions.AI.Templates.IntegrationTests/Snapshots/aichatweb.BasicAspire.verified/aichatweb/aichatweb.ServiceDefaults/Extensions.cs	Updates test snapshot for basic Aspire template
test/ProjectTemplates/Microsoft.Extensions.AI.Templates.IntegrationTests/Snapshots/aichatweb.AzureOpenAI_Qdrant_Aspire.verified/aichatweb/aichatweb.ServiceDefaults/Extensions.cs	Updates test snapshot for Azure OpenAI with Qdrant template
test/ProjectTemplates/Microsoft.Extensions.AI.Templates.IntegrationTests/Snapshots/aichatweb.Ollama_Qdrant.verified/aichatweb/aichatweb.ServiceDefaults/Extensions.cs	Updates test snapshot for Ollama with Qdrant template

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[JamesNK]

This is a design change that requires agreement of MEAI team before merging.

[stephentoub]

@JamesNK, based on #6736 (comment), this can be closed, right? Thanks.