Add measures and tags with mediator object to the HttpClientLatencyLogEnricher

[rainsxng]

Microsoft Reviewers: Open in CodeFlow

[Copilot]

Pull Request Overview

This pull request introduces a new HttpLatencyMediator object to enhance HTTP client latency telemetry by adding measures and tags recording capabilities. The mediator provides a centralized way to record GC pause time measurements and HTTP version tags during HTTP request processing.

Key changes:

• Adds HttpLatencyMediator class with platform-specific implementations for .NET and .NET Framework
• Introduces HttpMeasures and HttpTags classes to define metric names and tag names
• Updates the log enricher to include tags and measures in the output format with versioned schema

Reviewed Changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
HttpLatencyMediator.cs	New mediator class for .NET that records GC pause time measures and HTTP version tags
HttpLatencyMediator.netfx.cs	.NET Framework version of the mediator with limited functionality (tags only)
HttpMeasures.cs	Defines HTTP-related measure names including GC pause time
HttpTags.cs	Defines HTTP-related tag names including HTTP version
HttpLatencyTelemetryHandler.cs	Updated to accept and use the mediator for recording start metrics
HttpClientLatencyLogEnricher.cs	Enhanced to use mediator and include tags/measures in enriched log output
HttpClientLatencyTelemetryExtensions.cs	Registers the mediator and measure/tag names with DI container
Test files	Updated to include mediator parameter in constructor calls and added comprehensive tests

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[evgenyfedorov2]

there should be changes in the https://github.com/dotnet/extensions/blob/cdb9ce445cf26ea3969284f0f9e53fdb2f7faab8/src/Libraries/Microsoft.Extensions.Http.Diagnostics/Latency/Internal/HttpRequestLatencyListener.cs file too