In order to assist our users with WT cache sizing, we need to be able to estimate cache hit ratio per namespace/index. As far as I can tell, we only know the number of pages read from disk, but we don't track the total number of requested pages. Do we have that metric already available? If not, can we add this? I believe Oracle tracks all those numbers, based on this: http://topobaseinsiders.typepad.com/the_topobase_insiders/2007/07/oracle-databa-3.html