Worked on the mongodb/mongodb-kubernetes repository to address a critical issue affecting service availability during rolling upgrades. Focused on backend development using Go and Kubernetes, the developer fixed the handling of PublishNotReadyAddresses for Ops Manager and BackupDaemon services, ensuring that traffic was not routed to NotReady pods. The solution involved implementing an override pattern to reset PublishNotReadyAddresses after BuildService across multiple call sites. Comprehensive test coverage was added, updating the test suite to achieve full pass across twelve controller packages. The work included linking the relevant Jira ticket, updating the changelog, and preparing documentation changes for the upcoming release.