[Containerapp] az containerapp env create: Pre-announce future logs destination default change

[Michael Dai (michaelkira)]

🤖 PR Validation — ️✔️ All clear

Breaking Changes	Tests
️✔️ None	️✔️ 130/130

Related command

az containerapp env create

Description

Pre-announces the future change of the --logs-destination default from log-analytics to azure-monitor using the standard breaking-change registration.

This PR does NOT change the current default or create behavior. The warning links to the migration information in #34228. To retain Log Analytics behavior after the eventual change, users should explicitly pass --logs-destination log-analytics.

Release coordination

• Implementation PR: [Containerapp] BREAKING CHANGE: Change default logs destination to Azure Monitor #34228
• This announcement must ship in a released CLI version before the minimum 30-day notice period starts. Merging this PR alone does not start that period.
• Hold the implementation PR until the notice period has elapsed and the CLI team confirms an eligible breaking-change window.
• The currently listed November 16, 2026 breaking-change release is less than 30 days from October 20, 2026. This PR does not promise that release.
• Uses target_version=None, following existing VM pre-announcements, to say "in a future release" rather than automatically promising the next window. Maintainers: please confirm the target version/window and announcement release.
• After the announcement is published, its release version/date and the confirmed implementation target should be recorded in the implementation PR.

Testing Guide

• python -m pytest src\azure-cli\azure\cli\command_modules\containerapp\tests\latest\test_containerapp_breaking_change.py -q: PASSED (1 test). Verifies the warning registration, always-displayed tag, future-release wording, migration link, and unchanged handler default.
• azdev style azure-cli-containerapp: PASSED (Pylint and Flake8).
• Mocked CLI invocation of containerapp env create -g test-rg -n test-env -l australiaeast: PASSED. Confirmed the runtime warning is emitted and the handler receives log-analytics; the creation decorator was mocked and extension discovery disabled for isolation.

History Notes

[Containerapp] az containerapp env create: Pre-announce the future change of the --logs-destination default from log-analytics to azure-monitor; the current default remains unchanged

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[microsoft-github-policy-service]

Thank you for your contribution Michael Dai (@michaelkira)! We will review the pull request and get back to you soon.

[Copilot]

🟢 Approval recommended

The scoped changes use existing warning infrastructure, preserve current behavior, and have no identified blocking issues.

No open issues 🎉

What changed in this PR

Pre-announces the future Container Apps logs destination default change without changing current creation behavior.

Changes:

• Registers a future-release warning with a migration link, without promising a release window.
• Adds a regression test for the warning and unchanged log-analytics default.

File	Description
src/​azure-cli/​azure/​cli/​command_modules/​containerapp/​tests/​latest/​test_containerapp_breaking_change.py	Verifies warning registration, wording, visibility, and current default.
src/​azure-cli/​azure/​cli/​command_modules/​containerapp/​_breaking_change.py	Registers the default-change pre-announcement.

_{Review effort: Balanced}

[Aditya Pujara (a0x1ab)]

/azp run

[x-engineering-agent]

Hi Michael Dai (@michaelkira),
Since the current milestone time is less than 7 days, this pr will be reviewed in the next milestone.

[azure-pipelines]

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