[release/13.4] Restore dotnet watch dashboard auto-launch signal

[JamesNK]

Backport of #17610 to release/13.4

/cc @JamesNK

Customer Impact

dotnet watch cannot automatically open the dashboard browser when running an Aspire 13.4 AppHost. This is a regression from 13.3 — the legacy login log line that dotnet watch depends on to detect when the AppHost is serving HTTP traffic was removed in the new dashboard summary refactoring.

Fixes #17591

Testing

Unit tests added/updated covering the shared dashboard logging helper, the dashboard browser token auth integration test, and the AppHost dashboard-ready event handler. All tests pass on the release/13.4 branch.

Risk

Very low. Adds a single additional LogInformation call before the existing dashboard summary output. No behavioral change to any other code path.

Regression?

Yes — regressed in 13.4 when the dashboard summary output was refactored and the legacy login line was dropped.

[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 -- 17653

Or

• Run remotely in PowerShell:

iex "& { $(irm https://raw.githubusercontent.com/microsoft/aspire/main/eng/scripts/get-aspire-cli-pr.ps1) } 17653"

[Copilot]

Pull request overview

This backport restores a legacy dashboard “login” log line that dotnet watch relies on to detect when an Aspire AppHost is serving HTTP traffic and auto-launch the dashboard browser, addressing a regression introduced in 13.4’s dashboard summary refactor.

Changes:

• Reintroduced an explicit LogInformation compatibility line: Login to the dashboard at {LoginUrl} when a login URL is available.
• Updated unit/integration tests to expect the additional log entry and validate the structured LoginUrl value.
• Extended AppHost dashboard-ready event handler test coverage to assert the legacy login log is emitted.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
src/Shared/LoggingHelpers.cs	Emits the legacy “Login to the dashboard…” log line (structured) ahead of the existing dashboard summary output.
tests/Aspire.Dashboard.Tests/LoggingHelpersTests.cs	Updates expectations to account for the additional login log entry and validates its structured fields/message.
tests/Aspire.Dashboard.Tests/Integration/FrontendBrowserTokenAuthTests.cs	Adjusts log-output sequence assertions to include the restored legacy login log and validates token query presence.
tests/Aspire.Hosting.Tests/Dashboard/DashboardEventHandlersTests.cs	Adds assertion that the AppHost dashboard-ready path emits the legacy login log with the expected URL.

[github-actions]

❓ CLI E2E Tests unknown — 107 passed, 0 failed, 2 unknown (commit 19efac1)

View all recordings

Status	Test	Recording	Job	Artifacts
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[aspire-repo-bot]

✅ No documentation update needed.

docs_optional → bug_fix_restores_documented_behavior

No triggered signals (signal_count = 0, recommendation = docs_optional).

This PR is a backport (from #17610) that restores a regression: dotnet watch's ability to auto-launch the dashboard browser was broken in 13.4 when the legacy "Login to the dashboard at {LoginUrl}" log line was dropped during the dashboard summary refactor. The fix re-emits that log line so dotnet watch can detect when the AppHost is ready.

All 4 changed files are implementation (src/Shared/LoggingHelpers.cs) and tests (tests/). The behavior being restored was already present and documented in 13.3 — no new user-facing surface, flags, configuration, or APIs were introduced.