Restore dotnet watch dashboard auto-launch signal

[Copilot]

Description

dotnet watch depends on the exact dashboard login log shape to detect when the AppHost is serving HTTP traffic and open the browser. Aspire 13.4 kept the login URL in the new dashboard summary, but no longer emitted the legacy line that dotnet watch recognizes.

• Compatibility signal

  • Emit the legacy login line when a dashboard login URL is available:

    Login to the dashboard at https://localhost:17106/login?t=...
    

  • Document that the exact log template is a compatibility contract with dotnet watch.

• Existing output preserved

  • Keep the new dashboard summary output, including Dashboard, Login URL, and OTLP endpoint lines.

• Coverage

  • Added assertions for the shared dashboard logging helper.
  • Added AppHost dashboard-ready coverage for the emitted login URL.
  • Updated dashboard browser token log-output coverage to account for the restored legacy login line.

Checklist

• Is this feature complete?
  • Yes. Ready to ship.
  • No. Follow-up changes expected.
• Are you including unit tests for the changes and scenario tests if relevant?
  • Yes
  • No
• Did you add public API?
  • Yes
    • If yes, did you have an API Review for it?
      • Yes
      • No
    • Did you add <remarks /> and <code /> elements on your triple slash comments?
      • Yes
      • No
  • No
• Does the change make any security assumptions or guarantees?
  • Yes
    • If yes, have you done a threat model and had a security review?
      • Yes
      • No
  • No

[github-actions]

🚀 Dogfood this PR with:

⚠️ WARNING: Do not do this without first carefully reviewing the code of this PR to satisfy yourself it is safe.

curl -fsSL https://raw.githubusercontent.com/microsoft/aspire/main/eng/scripts/get-aspire-cli-pr.sh | bash -s -- 17610

Or

• Run remotely in PowerShell:

iex "& { $(irm https://raw.githubusercontent.com/microsoft/aspire/main/eng/scripts/get-aspire-cli-pr.ps1) } 17610"

[Copilot]

Pull request overview

Restores a legacy “Login to the dashboard at …” log line so dotnet watch can detect when the dashboard login URL is available and auto-launch a browser, while keeping the newer multi-line dashboard summary output intact.

Changes:

• Emit an additional structured LogInformation line ("Login to the dashboard at {LoginUrl}") when a dashboard login URL can be constructed.
• Update shared logging helper unit tests to assert the extra log entry and its structured payload.
• Extend AppHost dashboard-ready test coverage to assert the legacy login line is emitted with the endpoint-resolved URL.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
tests/Aspire.Hosting.Tests/Dashboard/DashboardEventHandlersTests.cs	Adds assertions that the legacy login line is emitted and contains the expected resolved login URL.
tests/Aspire.Dashboard.Tests/LoggingHelpersTests.cs	Updates expectations to account for the additional legacy login log entry and validates structured fields.
src/Shared/LoggingHelpers.cs	Adds the legacy login LogInformation line when loginUrl is available, preserving existing summary logging.

[karolz-ms]

@copilot looks like this change caused FrontendBrowserTokenAuthTests.LogOutput_NoToken_GeneratedTokenLogged to start failing. Investigate and fix.

[Copilot]

@copilot looks like this change caused FrontendBrowserTokenAuthTests.LogOutput_NoToken_GeneratedTokenLogged to start failing. Investigate and fix.

Fixed in a5e6d63 by updating the browser token log-output assertion to expect the restored legacy login line before the dashboard summary. Targeted dashboard auth tests pass.

[JamesNK]

@copilot resolve the merge conflicts in this pull request

Add a comment to logger.LogInformation("Login to the dashboard at {LoginUrl}", loginUrl); that this log message is used by dotnet watch and not to change it

[Copilot]

@copilot resolve the merge conflicts in this pull request

Add a comment to logger.LogInformation("Login to the dashboard at {LoginUrl}", loginUrl); that this log message is used by dotnet watch a...

Resolved the merge conflicts in f4215a7 and added the dotnet watch contract comment in b6aede9. Targeted dashboard tests pass.

[github-actions]

❓ CLI E2E Tests unknown — 107 passed, 0 failed, 2 unknown (commit cfb8db4)

View all recordings

Status	Test	Recording	Job	Artifacts
✅	AddPackageInteractiveWhileAppHostRunningDetached	Recording	#78433006293	Logs
✅	AddPackageWhileAppHostRunningDetached	Recording	#78433006293	Logs
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✅	AgentMcpListStructuredLogsReturnsLogsFromStarterApp_DevLocalhost	Recording	#78433006076	Logs
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✅	AllPublishMethodsBuildDockerImages	Recording	#78433006247	Logs
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✅	AspireInitWithExistingAppHostDirRecreatesMissingNuGetConfigAndPreservesFiles	Recording	#78433006139	Logs
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_{📹 Recordings uploaded automatically from CI run #26615995178}

[JamesNK]

/backport to release/13.4

[github-actions]

Started backporting to release/13.4 (link to workflow run)

[aspire-repo-bot]

@JamesNK backporting to release/13.4 failed, the patch most likely resulted in conflicts. Please backport manually!

git am output

$ git am --3way --empty=keep --ignore-whitespace --keep-non-patch changes.patch

Creating an empty commit: Initial plan
Applying: Emit dashboard login line for dotnet watch
Applying: Fix dashboard browser token log test
Applying: Clarify dotnet watch login log contract
Using index info to reconstruct a base tree...
M	src/Shared/LoggingHelpers.cs
Falling back to patching base and 3-way merge...
Auto-merging src/Shared/LoggingHelpers.cs
CONFLICT (content): Merge conflict in src/Shared/LoggingHelpers.cs
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
hint: When you have resolved this problem, run "git am --continue".
hint: If you prefer to skip this patch, run "git am --skip" instead.
hint: To restore the original branch and stop patching, run "git am --abort".
hint: Disable this message with "git config set advice.mergeConflict false"
Patch failed at 0004 Clarify dotnet watch login log contract
Error: The process '/usr/bin/git' failed with exit code 128

Link to workflow output