During March 2025, Mattias Buelens enhanced the androidx/media repository by implementing a configurable CMCD (Content Metadata) management system using Java and ExoPlayer. He introduced a mechanism allowing CMCD to be disabled at runtime by returning null from the configuration factory, providing greater flexibility for analytics and data transmission. Mattias also addressed a critical bug to ensure that no CMCD data, including playback rate, is sent when no keys are permitted, thereby preserving data integrity. His work included expanding test coverage to validate these behaviors, demonstrating depth in configuration management and network protocol handling within media playback workflows.