ditto here about `local host`. i think it is more proper to use local worker    can you provide a bit more context on what `USER_FILE_WRITE_AVOID_EVICTION_POLICY_RESERVED_BYTES ` is? right now i'm reading it as a plain string; is it a configuration property? a metric key? also add backticks around it    also i'm just noticing, did this policy exist before? or did we just not document it?