Out of interest, did you do `git mv software/nosql/src/main/java/brooklyn/entity/nosql/cassandra/CassandraCluster.java software/nosql/src/main/java/brooklyn/entity/nosql/cassandra/CassandraDatacenter.java`? It looks like git doesn't know that effectively this file was renamed, so the change history of `CassandraDatacenter` is empty.