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az containerapp update resets template.scale.cooldownPeriod to 300 #10334

Description

Describe the bug

Our Container App is provisioned with Terraform using
cooldown_period_in_seconds = 3600. The deployed app initially reports
properties.template.scale.cooldownPeriod as 3600.

After we run az containerapp update to deploy a new image, the value changes
to the default of 300, even though the update command does not specify a
cooldown period.

Related command

az containerapp update -g -n
--image /:

Errors

/

Issue script & Debug output

/

Expected behavior

/

Environment Summary

azure-cli 2.88.0 *

core 2.88.0 *
telemetry 1.1.0

Dependencies:
msal 1.36.0
azure-mgmt-resource 24.0.0

Python location '/usr/bin/python3.12'
Config directory '/root/.azure'
Extensions directory '/root/.azure/cliextensions'

Python (Linux) 3.12.9 (main, Jun 2 2026, 15:09:20) [GCC 13.2.0]

Legal docs and information: aka.ms/AzureCliLegal

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    Auto-AssignAuto assign by botContainerAppService AttentionThis issue is responsible by Azure service team.act-observability-squadbugThis issue requires a change to an existing behavior in the product in order to be resolved.customer-reportedIssues that are reported by GitHub users external to the Azure organization.

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