MongoDB 3.4.0-rc4 is released and is now available for testing. This release candidate marks the culmination of the 3.4.x development series, with a focus on community involvement to ensure quality. The MongoDB team invites users to participate in the Bug Hunt program and provides resources to help get up to speed on upcoming features through their online course. A total of 17 fixes have been addressed in this release candidate, including issues related to deadlocks, sharded collections, geoNear density estimators, and concurrency suites.