[Tiramisu Splitting Up Work] Tiramisu disk tier stats and disk tier integration #22
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Description
This adds stats to the disk tier, accessible via node stats API. It also turns on the disk tier within the IRC - this is done here because functioning stats are required for IRC tests to work, and because we can't test the new stats without a functioning disk tier in the IRC.
Related Issues
Part of tiered caching
Check List
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