We currently index WiredTiger stats by human readable strings that come from upstream WiredTiger codebase, e.g. `"cache: eviction calls to get a page found queue empty"`. These strings are used literally throughout the `storage` codebase and now metrics generation. Consider refactoring these so that they are gated by a global variable or enum to prevent drift.

Challenge: the storage codebase trims some of these strings during BSON conversion, so the aforementioned string becomes `"eviction calls to get a page found queue empty"` as a BSON key. This may be why their team chose not to implement them as variables and presents an engineering challenge.

Challenge 2: The WiredTiger storage module has no public API, making it difficult to coordinate scopes.