There are no formal standards on Open Source projects. There are only guides.
Source: The following is from TODO on "Measuring your open source program's success"
Open source program managers must demonstrate the ROI of their efforts. This guide provides an overview of some of the standard ways that organizations evaluate their open source programs, projects, and contributions.
Learn what to measure, how to define success, and how to best use this information to advance your open source program objectives, demonstrate effectiveness, and gain support.