In WRITING-17021, we enumerated all of the possible metrics provided by tcmalloc.

There are many metrics that are directly exposed by tcmalloc, which will be integrated in SERVER-86265.

However, there are also quite a few that would require a patch to our fork of tcmalloc. In the interest of prioritizing the most important work to release tcmalloc, we opted to only include the metrics exposed directly. The existing metrics may be more than enough to diagnose most allocator issues, but if they are not, this is a placeholder ticket to note that there are more metrics available, and we should think about adding them.