No runners available and workflows queueing for ah-ubuntu_22_04-c7g_4x-50 in iree-org/iree

What is the issue you are facing?

These two workflows in https://github.com/iree-org/iree have been queuing for almost 2 days, waiting on ah-ubuntu_22_04-c7g_4x-50 runners:

• https://github.com/iree-org/iree/actions/workflows/build_package.yml (workflow source: https://github.com/iree-org/iree/blob/5b9c4d9900d880df1b3b25dd90fe6daca2659dfd/.github/workflows/build_package.yml#L129-L133)
• https://github.com/iree-org/iree/actions/workflows/ci_linux_arm64_clang.yml (workflow source: https://github.com/iree-org/iree/blob/main/.github/workflows/ci_linux_arm64_clang.yml)

Can you provide a link to the failed GitHub Action?

See above

Is this reproducible?

Yes

Any other information that can help us

We've had the "Arm Hosted GHA Runners" app installed in that repository since September 30 and it has been working very well. This is the first time we've noticed any issues. The app still appears to be configured, and I'm not aware of any changes on our end.