Type of Request

infra task

Infrastructure Environment

Devicelab

What is happening?

Prerequisites

• Official macOS 15.5 release
• Run all flutter/flutter macOS tests manually on macOS 15.5 bot #167682
• Update .ci.yaml in flutter/flutter to use either macOS 14 or macOS 15 #167824
• Run all flutter/packages macOS tests manually on macOS 15.5+ bot #167822
• Update .ci.yaml in flutter/packages to use either macOS 14 or macOS 15 #167825
• Ensure no open issues in Tracking issue for any infra or test failures with macOS 15 #167681

Upgrade ~50% of bots to macOS 15.5 per arch per pool

• Always leave at least 2 bots per arch in the try and prod pools on macOS 14 to maintain beta/stable - 1 to run tests and 1 as a backup
• beta/stable doesn't use staging so don't need to reserve bots in staging pool

Device lists:

• Try pool - iOS arm64 bots
• Try pool - iOS x86 bots
• Try pool - Android bots
• Staging pool - iOS arm64 bots
• Staging pool - iOS x86 bots
• Staging pool - Android arm64 bots
• Staging pool - Android x86 bots
• Prod pool - iOS arm64 bots
• Prod pool - iOS x86 bots
• Prod pool - Android arm64 bots
• Prod pool - Android x86 bots

When ready to upgrade, file an issue with a list of explicit bots listed by name to upgrade and additional instructions. See #148859 as example

If something goes wrong or tests begin to fail, .ci.yaml changes from #167824, #167825 can be reverted if necessary.

Steps to reproduce

No response

Expected results

No response