Right, but that doesn't give you a good idea of how close your working set is to the max memory cache, unless your entire DB is active. I'll ping them again an

Right, but that doesn't give you a good idea of how close your working set is to the max memory cache, unless your entire DB is active. I'll ping them again and ask if they've found a good way to measure this. It seems like this is the most important number to look at when scaling a heroku/postgres project.