* refactor: require `Resource`s to be convertible to `u64`
* refactor: require `Resource`s to have a unit name
* refactor: make LRU cache IDs static
* feat: add LRU cache metrics
* docs: improve type names in LRU doctest
* docs: epxlain `MeasuredT`
Co-authored-by: Andrew Lamb <andrew@nerdnetworks.org>
* docs: explain `test_metrics`
Co-authored-by: Andrew Lamb <andrew@nerdnetworks.org>
* feat: `SortKey::size`
* feat: `FunctionEstimator`
* feat: querier RAM pool
Let's put all the caches into a single RAM pool, so we can at least
somewhat control RAM usage. Note that this does NOT limit the peak
memory during query execution though, but should at least stop unlimited
cache growth. A follow-up PR will add metrics.
* refactor: improve some size calculations
Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>