Upcoming Deprecation of macOS-12 Hosted Pipeline Image - Azure DevOps Blog
Briefly

Azure DevOps is initiating the deprecation of the macOS-12 (Monterey) hosted pipelines image, encouraging users to migrate to macOS-latest or macOS-14.
Users may experience longer queue times during peak usage hours as the macOS-12 image is phased out, with full support ending on December 3.
To raise awareness, Azure DevOps will temporarily fail jobs using macOS-12 during scheduled brownouts on November 4, 11, 18, and 25, 2023.
The macos-latest hosted pipelines agent image has now transitioned to use macOS-14 (Sonoma), indicating a shift towards newer operating system support.
Read at Azure DevOps Blog
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