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45c7783018
Today if metadata persistence is excessively slow on a master-ineligible node then the `ClusterApplierService` emits a warning indicating that the `GatewayMetaState` applier was slow, but gives no further details. If it is excessively slow on a master-eligible node then we do not see any warning at all, although we might see other consequences such as a lagging node or a master failure. With this commit we emit a warning if metadata persistence takes longer than a configurable threshold, which defaults to `10s`. We also emit statistics that record how much index metadata was persisted and how much was skipped since this can help distinguish cases where IO was slow from cases where there are simply too many indices involved. Backport of #47005.