Debian Team Activity Metrics
In a GSoC project in 2011 Sukhbir Singh (mentored by Andreas Tille) created a database gathering data from mailing lists and version control system of certain teams in Debian. The data and graphs produced from this database will be updated monthly.
There is a mailing list to discuss issues about teammetrics which can be used to ask for adding your team to the sentinel.
The code for this project is hosted on Salsa.