Type of Request

infra task

Infrastructure Environment

Devicelab

What is happening?

Prerequisites

• Upgrade 25% of iOS devices to iOS 18 #148969 as been landed for 1-2 releases
• Ensure no open issues in ☂️ Tracking issue for any infra or test failures with iOS 18 physical devices #148966

Upgrade ~50% of bots to iOS 18 per arch per pool (always leave at least 2 bots per arch in the try and prod pools on iOS 17 to maintain beta/stable)

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

When ready to upgrade, file an issue with a list of explicit bots listed by name to upgrade and include the following additional instructions:

1. Before starting upgrade, quarantine the bot
2. After upgrading device
   1. Open Xcode 16 from /opt/flutter/xcode/[insert Xcode build version]/XCode.app
   2. In the top bar, open Window > Device and Simulators
   3. The window that opens should show the connected device
   4. Accept the Trust dialog on the iPhone device
   5. If you get the dialog on the device twice, you may need to accept it once, disconnect, reconnect, and accept again.
   6. Wait for the yellow bar at the top of the Device and Simulators window to go away - It should take a minute or so to Copy cache symbols
3. Unquarantine the bot

See #142326 as example.

Note: This can create noise in iOS benchmarks as multiple iOS versions are being tested and probably should be mentioned in a PSA

Steps to reproduce

No response

Expected results

No response