[App Service] Add Active Backup silo management preview

[JarodAertsMsft]

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Breaking Changes	Tests
⚠️ None	️✔️ 130/130

⚠️AzureCLI-BreakingChangeTest

⚠️appservice

rule	cmd_name	rule_message	suggest_message
⚠️ 1011 - SubgroupAdd	appservice plan silo	sub group appservice plan silo added
⚠️ 1011 - SubgroupAdd	webapp last-known-good	sub group webapp last-known-good added
⚠️ 1011 - SubgroupAdd	webapp managed-traffic	sub group webapp managed-traffic added
⚠️ 1011 - SubgroupAdd	webapp silo	sub group webapp silo added

Related command

az appservice plan silo, az webapp silo, az webapp managed-traffic, az webapp last-known-good

Description

Add preview commands to create and manage Active Backup silos for App Service plans and web apps across regions.

• Plan and site silo create/update/show/list/delete, with operation polling and --no-wait.
• Regional traffic configuration, Last Known Good, refresh, and silo VNet integration.
• Silo pass-through operations for configuration reads, deployments, logs, instances/processes, WebJobs, extensions, and diagnostics. Availability is decided by the service; the CLI does not filter these calls by OS or SKU.

Refresh returns on HTTP 204 acceptance, without waiting for revision propagation. New commands use API 2026-08-01; existing app/plan commands and API versions are unchanged. See the usage guide for command examples and service limitations.

Publishing-profile access is not included pending verification that the API targets the silo rather than the primary app.

Testing Guide

With an eligible primary plan/app and an enabled preview subscription, create the plan silo before the site silo:

az appservice plan silo create -g MyGroup -n MyPlan --silo WestPlan --location westus2 --primary-location eastus --number-of-workers 2
az webapp silo create -g MyGroup -n MyApp --silo WestApp --location westus2 --primary-location eastus --traffic-mode Active
az webapp silo show -g MyGroup -n MyApp --silo WestApp
az webapp silo refresh -g MyGroup -n MyApp

Local validation: 83 tests passed, including request/body assertions, operation polling, command execution/help, and existing App Service regression tests.

Test command

Run with repository src\azure-cli and src\azure-cli-core on PYTHONPATH:

& 'C:\Program Files\Microsoft SDKs\Azure\CLI2\python.exe' -m unittest azure.cli.command_modules.appservice.tests.latest.test_active_backup_client azure.cli.command_modules.appservice.tests.latest.test_active_backup_commands_thru_mock azure.cli.command_modules.appservice.tests.latest.test_import_ssl_cert azure.cli.command_modules.appservice.tests.latest.test_appservice_validators_thru_mock

Still draft: live two-region scenarios, deployed API-version verification, recordings, and full azdev validation/coverage checks have not been run.

History Notes

[App Service] az appservice plan silo, az webapp silo: Add preview Active Backup silo lifecycle, networking, and operational commands.
[App Service] az webapp managed-traffic, az webapp last-known-good: Add preview regional traffic and Last Known Good management.

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Thank you for your contribution JarodAertsMsft! We will review the pull request and get back to you soon.

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Hi JarodAertsMsft,
Since the current milestone time is less than 7 days, this pr will be reviewed in the next milestone.

[Yong Zhang (yonzhan)]

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