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Pull Requests (PRs) that are neither progressed nor resolved clutter the listof PRs, making it difficult for the maintainers to manage and prioritizeunresolved PRs. To automatically track, follow up, and close such inactive PRs,Stale bot was introduced by GitHub. Despite its increasing adoption, there areongoing debates on whether using Stale bot alleviates or exacerbates theproblem of inactive PRs. To better understand if and how Stale bot helpsprojects in their pull-based development workflow, we perform an empiricalstudy of 20 large and popular open-source projects. We find that Stale bot canhelp deal with a backlog of unresolved PRs as the projects closed more PRswithin the first few months of adoption. Moreover, Stale bot can help improvethe efficiency of the PR review process as the projects reviewed PRs that endedup merged and resolved PRs that ended up closed faster after the adoption.However, Stale bot can also negatively affect the contributors as the projectsexperienced a considerable decrease in their number of active contributorsafter the adoption. Therefore, relying solely on Stale bot to deal withinactive PRs may lead to decreased community engagement and an increasedprobability of contributor abandonment.

Understanding the Helpfulness of Stale Bot for Pull-based Development: An Empirical Study of 20 Large Open-Source Projects