R1:4783c3940d00

Summarize data cache usage and allocation information

Summary: Ref T5501. Group cache data by key pattern.

Test Plan: {F362994}

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T5501

Differential Revision: https://secure.phabricator.com/D12317