Engineer(s): Kevin, Jeremy, Andreas Summary: Support mongos instances behind a load balancer. This would require at least cursor / socket affinity and transaction / socket affinity so getMore and transactional operations always hit the same mongos instance. 2021-08-10: Updated target end date. to 2021-08-13 Evergreen testing in code review. Everything else is now wrapped up Planning on doing the 1.19.0 release later this week 2021-07-26: Updated target end date to 2021-08-06 Making steady progress, aiming to wrap up this week and do the C 1.19.0 release SDAM, Server Selection, and Handshake changes merged Error Handling in review Unified Test Format changes in review Next up: Events and Evergreen integration 2021-07-12: Updated target end date to 2021-07-23 Sessions changes merged SDAM, server selection changes were paused after discovering that CDRIVER-3653 (using handshake metadata for server checks) needed to be addressed first. CDRIVER-3653 is in draft review and almost ready Jeremy working on updates to monitoring events Andreas working on unified test runner updates Up next: Merge CDRIVER-3653 , Rebase SDAM and server selection changes and update single-threaded connection logic and Connection pool and error handling changes. C will do another release once this is done 2021-06-28: Maintaining target end date of 2021-07-09 MongoClient configuration changes nearly done, working on SRV polling tests SDAM changes up next 2021-06-15: Initial target end date of 2021-07-09 Completed prototyping and a test bed Next up: make an execution plan and create tickets for each of the PRs