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## Problem The current `tenant_slots` metric becomes less useful once we have lots of secondaries, because we can't tell how many tenants are really attached (without doing a sum() on some other metric). ## Summary of changes - Add a `mode` label to this metric - Update the metric with `slot_added` and `slot_removed` helpers that are called at all the places we mutate the tenants map. - Add a debug assertion at shutdown that checks the metrics add up to the right number, as a cheap way of validating that we're calling the metric hooks in all the right places.