GitHub's Site Reliability Engineers emphasize the importance of designing systems for failure, particularly through implementing redundancy in DNS management. By splitting DNS authority across multiple providers, GitHub can mitigate the risk of outages, ensuring service continuity even if one provider experiences issues. This approach, however, requires synchronizing records across providers, which can be complex. To manage this, GitHub has developed OctoDNS, a tool that facilitates DNS record management by storing configurations in Git repositories and using GitHub Flow for changes, enabling synchronized updates across providers like Dyn and Route53. OctoDNS offers Infrastructure as Code benefits to DNS management, allowing for preview deployments and streamlined updates, thus enhancing reliability and reducing the obstacles to implementing split DNS authority. The tool is positioned as a valuable asset for any site looking to improve DNS redundancy and management efficiency.