  Software metrics capture information about software development processes and
products. These metrics support decision-making, e.g., in team management or
dependency selection. However, existing metrics tools measure only a snapshot
of a software project. Little attention has been given to enabling engineers to
reason about metric trends over time -- longitudinal metrics that give insight
about process, not just product. In this work, we present PRiME (PRocess
MEtrics), a tool for computing and visualizing process metrics. The
currently-supported metrics include productivity, issue density, issue
spoilage, and bus factor. We illustrate the value of longitudinal data and
conclude with a research agenda. The tool's demo video can be watched at
https://youtu.be/YigEHy3_JCo. The source code can be found at
https://github.com/SoftwareSystemsLaboratory/prime.
