This metric measures the average number of co-committed files for the files below this location in the tree.

A co-committed file is one that is committed at the same time as a given file. For instance, if you commit files A, B and C together, then B and C would be the co-committed files of A for that commit. The value of the metric for an individual file is the average number of such co-committed files over all commits. The value of the metric for a directory is the aggregation of these averages - for instance, if we are using max as our aggregation function, the value would be the maximum of the average number of co-commits over all files in the directory.

An unusually high value for this metric may indicate that the file in question is too tightly-coupled to other files, and it is difficult to change it in isolation. Alternatively, it may just be an indication that you commit lots of unrelated changes at the same time.