I thought it was odd that our server always stayed shy of 8GB, despite -Xmx=16g ...but that was with version 0.197.51.
Now, the server just stuffs its face, with version 0.198.131
Originally wrote this off as an odd quirk the first few times...but there's a pattern here: ballooning has been occurring since the upgrade to 0.198.131. What additional information can we provide?