Merge Queues for Large Monorepos

Merge queues are a system that tests and organizes pull requests (PRs) in large monorepos, ensuring the main branch remains stable. They help manage dependencies, avoid conflicts, and handle numerous PRs by automating updates and testing. Aviator is a tool that makes this process smoother for large teams. Merge queues are especially important when dealing with many PRs coming in at once, as they can keep the development cycle moving smoothly. However, scaling merge queues for large monorepos presents its own set of challenges, such as managing an increasing number of PRs and commits, handling long build and test processes, and balancing speed with resource usage. Affected targets is a strategy that focuses on testing only the parts of the codebase directly impacted by a PR, saving time and computing resources. Flaky tests can disrupt merge queues, but optimistic validation helps keep the process moving smoothly. Batching is another technique that combines multiple PRs into a single CI run to reduce the total number of runs and minimize redundant testing. Aviator's tools provide efficient solutions for managing merge queues in large monorepos, ensuring stability and speed in the CI/CD process.