Harshavardhana e98172d72d
avoid hot-tier SLA to be tied to warm-tier SLA (#18581)
it is okay if the warm-tier cannot keep up, we should continue
to take I/O at hot-tier, only fail hot-tier or block it when
we are disk full.

Bonus: add metrics counter for these missed tasks, we will
know for sure if one of the node is lagging behind or is
losing too many tasks during transitioning.
2023-12-02 13:02:12 -08:00
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