Percona announces the release of Percona Server for MongoDB 3.4.21-2.19 on June 20, 2019. Download the latest version from the Percona website or the Percona software repositories. Percona Server for MongoDB is an enhanced, open source, and highly-scalable database that is a fully-compatible, drop-in replacement for MongoDB 3.4 Community Edition. It supports MongoDB 3.4 protocols and drivers. [&]

https://www.percona.com/blog/2019/06/20/percona-server-for-mongodb-3-4-21-2-19-now-available/