March 2026: Delivered Buck2 Daemon macOS QoS Configuration in facebook/buck2, introducing a dedicated buckconfig option to specify the macOS QoS class for the Buck2 daemon. This replaces the older BUCK2_DISABLE_MACOS_QOS env var and guides users toward a clearer, fleet-wide configurability model. The change requires a daemon restart when adjusted via [buck2] macos_qos_class and includes input validation to restrict QoS values to supported classes. This enhancement enables more precise scheduling priority tuning for macOS, aiding performance-sensitive tasks and reducing interference with user workloads. Prepared groundwork for rollout with soft deprecation messaging and migration guidance. PR reviewed by scottcao; Differential Revision: D94524092.

This month focused on stabilizing Apple-target platform registrations and improving build reliability for Buck2 projects. Implemented a configurable skip-generation option for Apple target platforms to prevent duplicate registrations across different C++ platforms, addressing a long-standing CI/build fragility when reusing base names. Changes were made in both Buck2 prelude and Buck2 core to ensure consistency and maintainability while preserving backward compatibility by default. Enhanced developer velocity by reducing configuration complexity and downstream error noise in builds and tests.

May 2025 performance summary for facebook/buck2-prelude focused on delivering macOS-specific packaging improvements and improving build reliability. The key delivery was AppleBundleResources support for .bundle files with proper packaging steps and signing, enhancing macOS app integrity and developer experience.

Concise monthly summary for 2025-03 focusing on facebook/buck2-prelude. Key features delivered and major fixes implemented with a focus on business value, reliability, and cross-platform readiness.