April 2025 (apache/jackrabbit-oak): Focused on increasing observability and GC efficiency for MongoDB-backed garbage collection. Key deliverable: a new metric to track and persist the total BSON size of removed garbage during full GC, enabling data-driven tuning and capacity planning. The work includes a new setting SETTINGS_COLLECTION_FULL_GC_REMOVED_TOTAL_BSON_SIZE, a wrapper MongoFullGcNodeBinSumBsonSize, and code changes across VersionGarbageCollector.java and MongoFullGcNodeBin.java, plus new metric instrumentation files. This item is linked to OAK-11671 and the commit eb852d6de7a7c696526acc21bf7e706aba3b150a. No major bugs fixed this month. Overall impact: improved visibility into memory footprint and GC behavior, supporting stability and performance improvements.

March 2025: Delivered configurable audit logging for the Full GC process in DocumentNodeStore on MongoDB, saving deleted document IDs and empty property names to a dedicated _bin collection for auditability. The feature is MongoDB-specific due to RDB limitations, enabling post-GC traceability, governance reporting, and safer GC operations. This work aligns with OAK-11444 and establishes a foundation for compliance-driven auditing while preserving existing performance characteristics on supported backends.