[CI Failure] Flaky: AppHostServerSessionTests.Start_StopRequested_GracefulSignalerThrows_StillEscalatesToKill fails intermittently on Windows

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Build Information

Build: https://github.com/microsoft/aspire/actions/runs/34815567672
Build error leg or test failing: Tests / No-package tests (regular, Aspire.Cli.Tests, Cli, Cli, tests/Aspire.Cli.Tests/Aspire.Cli.Tests.cs... / Cli (windows-latest) / Aspire.Cli.Tests.Projects.AppHostServerSessionTests.Start_StopRequested_GracefulSignalerThrows_StillEscalatesToKill
Pull request: #18763

Classification Analysis

Timing-sensitive assertion on process escalation/kill sequence in a test file not touched by the PR; sibling tests in the same class have documented flakiness under CI load.

Failure Information

Test output

Error:
Assert.Single() Failure: The collection was empty

Stack Trace:
at Aspire.Cli.Tests.Projects.AppHostServerSessionTests.Start_StopRequested_GracefulSignalerThrows_StillEscalatesToKill() in D:\a\aspire\aspire\tests\Aspire.Cli.Tests\Projects\AppHostServerSessionTests.cs:line 337
   at Aspire.Cli.Tests.Projects.AppHostServerSessionTests.Start_StopRequested_GracefulSignalerThrows_StillEscalatesToKill() in D:\a\aspire\aspire\tests\Aspire.Cli.Tests\Projects\AppHostServerSessionTests.cs:line 337
--- End of stack trace from previous location ---

Description

Flaky: AppHostServerSessionTests.Start_StopRequested_GracefulSignalerThrows_StillEscalatesToKill fails intermittently on Windows

Type: flaky-test

Occurrences

Date	Build	Job	PR
2026-09-14	34815567672	Tests / No-package tests (regular, Aspire.Cli.Tests, Cli, Cli, tests/Aspire.Cli.Tests/Aspire.Cli.Tests.cs... / Cli (windows-latest)	#18763