How we run parallel merge queues on our own monorepo

In a monorepo environment, managing a single merge queue can result in inefficiencies, as all pull requests (PRs) wait in line and a failure in one PR can delay others. Mergify addresses this issue by using scopes to group related changes and run unrelated ones in parallel, which optimizes the merge process by allowing independent testing and merging of PRs. Scopes are defined by mapping specific areas of the codebase, such as frontend or backend, to file patterns, allowing PRs that only affect certain areas to be tested together. This scope-aware batching minimizes the impact of failures to only those changes that are related, enabling continuous flow even if a PR fails in one scope. The company has implemented this system in their monorepo, grouping changes into scopes like installer, dashboard, and engine, and running tests in parallel, which enhances efficiency by preventing unrelated changes from being delayed by issues in other parts of the codebase.

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