SendAsync_ConnectionFailure_RecordsActivitiesWithCorrectErrorInfo failed on macOS

## Build Information
Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=1577527
Build error leg or test failing: System.Net.Http.Functional.Tests.SyncHttpHandler_DiagnosticsTest.SendAsync_ConnectionFailure_RecordsActivitiesWithCorrectErrorInfo
Pull request: https://github.com/dotnet/runtime/pull/132639

## Error Message

**DO NOT USE JSON BELOW IF THIS IS A BUILD BREAK** otherwise build analysis will allow pull requests to merge that break the build worse. For a build break, do not use this issue form. Make a regular new issue.

Fill the error message using [step by step known issues guidance](https://github.com/dotnet/arcade/blob/main/Documentation/Build%20Analysis/KnownIssueJsonStepByStep.md).

```json
{
"ErrorMessage": "System.Net.Http.Functional.Tests.SyncHttpHandler_DiagnosticsTest.SendAsync_ConnectionFailure_RecordsActivitiesWithCorrectErrorInfo(failureType: \"socket\") [FAIL]",
"ErrorPattern": "",
"BuildRetry": false,
"ExcludeConsoleLog": false
}
```

### Known issue validation
**Build: :mag_right:** https://dev.azure.com/dnceng-public/public/_build/results?buildId=1577527
**Error message validated:** `[System.Net.Http.Functional.Tests.SyncHttpHandler_DiagnosticsTest.SendAsync_ConnectionFailure_RecordsActivitiesWithCorrectErrorInfo(failureType: "socket") [FAIL]`]
**Result validation:** :white_check_mark: Known issue matched with the provided build.
**Validation performed at:** 9/2/2026 8:47:38 PM UTC

### Report

|Build|Repository|Test|Pull Request|
|---|---|---|---|
|[1596881](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1596881)|dotnet/runtime|[System.Net.Http.Functional.Tests.SyncHttpHandler_DiagnosticsTest.SendAsync_ConnectionFailure_RecordsActivitiesWithCorrectErrorInfo](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1596881&view=ms.vss-test-web.build-test-results-tab&runId=44085468&resultId=231964)|dotnet/runtime#132827|
|[1590439](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1590439)|dotnet/runtime|[System.Net.Http.Functional.Tests.SyncHttpHandler_DiagnosticsTest.SendAsync_ConnectionFailure_RecordsActivitiesWithCorrectErrorInfo](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1590439&view=ms.vss-test-web.build-test-results-tab&runId=43901084&resultId=194729)|dotnet/runtime#133483|
|[1589850](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1589850)|dotnet/runtime|[System.Net.Http.Functional.Tests.SyncHttpHandler_DiagnosticsTest.SendAsync_ConnectionFailure_RecordsActivitiesWithCorrectErrorInfo](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1589850&view=ms.vss-test-web.build-test-results-tab&runId=43884688&resultId=231671)|dotnet/runtime#132687|
|[1577527](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1577527)|dotnet/runtime|[System.Net.Http.Functional.Tests.SyncHttpHandler_DiagnosticsTest.SendAsync_ConnectionFailure_RecordsActivitiesWithCorrectErrorInfo](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1577527&view=ms.vss-test-web.build-test-results-tab&runId=43500698&resultId=217324)|dotnet/runtime#132639|
#### Summary
|24-Hour Hit Count|7-Day Hit Count|1-Month Count|
|---|---|---|
|1|3|4|

Start with System.Net.Http.Functional.Tests.SyncHttpHandler_DiagnosticsTest.SendAsync_ConnectionFailure_RecordsActivitiesWithCorrectErrorInfo and the linked build results for the macOS failure. Review the related pull requests listed in the report; done means the test passes reliably on macOS without recurring known-issue matches.

Written by the indexing model from the issue text.