MongoDB 3.0.12 is out and is ready for production deployment. This release contains only fixes since 3.0.11, and is a recommended upgrade for all 3.0 users.
Fixed in this release:
SERVER-22831 Low query rate with heavy cache pressure and an idle collection
SERVER-22964 IX GlobalLock being held while wating for wt cache eviction
SERVER-22970 Background index build produces an index with mismatched index keys and documents
SERVER-23807 Updates should always throw WriteConflictException on unindexing
As always, please let us know of any issues.
-- The MongoDB Team