There are a set of statistics tracking content in cache, it would be great if they sorted together alphabetically so that they appeared as a group in tools. Most already start with the word bytes - using that as a prefix would probably be enough. The set of statistics I think fit into this category (sorted by their alphabetical description) are:

cache_bytes_image : bytes belonging to page images in the cache
cache_bytes_lookaside : bytes belonging to the cache overflow table in the cache
cache_bytes_inuse : bytes currently in the cache
cache_bytes_other : bytes not belonging to page images in the cache
cache_bytes_read : bytes read into cache
cache_bytes_dirty_total : bytes that have been dirtied in the cache
cache_bytes_write : bytes written from cache
cache_bytes_max : maximum bytes configured
cache_bytes_internal : tracked bytes belonging to internal pages in the cache
cache_bytes_leaf : tracked bytes belonging to leaf pages in the cache
cache_bytes_dirty : tracked dirty bytes in the cache