in src/main/java/org/apache/maven/plugins/changelog/DeveloperActivityReport.java [219:224]
private void countDevCommits(Collection<ChangeSet> entries) {
for (ChangeSet entry : entries) {
List<ChangeSet> list = commits.computeIfAbsent(entry.getAuthor(), k -> new LinkedList<>());
list.add(entry);
}
}