From the article: >In OS X 10.10, this logging was turned on by default for some applications that use a custom memory allocator, such as jemalloc, because of

From the article: >In OS X 10.10, this logging was turned on by default for some applications that use a custom memory allocator, such as jemalloc, because of an initialization bug in the framework. So it seems to be a bug that it even got enabled.