Albert's item about Okular contributors (a great idea to thank those who contributed their time over the past year -- and I'll say thank you to all the Okular developers who make my document-reading-life a nicer place) and also Seif writing about Mozilla contributions spurred me to quickly hack together a tool to give an idea of the activity in one of KDE's git repositories. It's much like the venerable green-blobs graph that Paul Adams makes. It's just an indicator -- I've written about this time and time again, the graphs from one repository cannot be compared with other repositories, and the best you can quickly conclude based on these pictures is whether development activity in a repository is carrying on "as usual" or has changed.
- The green blobs indicate that the named contributor committed in that week. So for Albert (the same one) there's a single commit at about week 40 in this view. Christian (Muschick, I was lazy in coding up the labels and just cut off the string at 10 characters) was active about half a year ago, and there are incidental commits from others. Script Kid is our own translation commit-bot, who shows up everywhere. Anyway, the green blobs give an idea of who's active, when.
- The red line is an indicator of how large the active contributor community is. The bottom of the image is 0 (up to a maximum of all the contributors). In the past, we defined all kinds of complicated metrics to do so, with exponential decay applied to each contributor's "activeness" and such. This one is dead simple: a participant is an active contributor if he or she has a commit in a given week or in the previous week. That is, each person is considered active for at least seven days after their last commit. This is easiest to see at the beginning of the graph, where Jan's single commit shows two weeks of "active community size is 1", and right in the middle, where Scripty counts for two weeks and then drops away.
- The top black-ish line gives an indication of "temperature" in the repository, mapping the number of commits that week to a color, where pure red is "the maximum number of commits" and black is "none at all". Since this repository has a maximum of three commits in a week, the color scale shows few different levels. This is another way of looking at the activity of the repository. Instead of number of active contributors, look at the average commit-churn.