Tim Burke 9bed525bfb memcached: Give callers the option to accept errors
Auth middlewares in particular may want to *know* when there's a
communication breakdown as opposed to a cache miss.

Update our shard-range cache stats to acknowlegde the distinction.

Drive-by: Log an error if all memcached servers are error-limited.

Change-Id: Ic8d0915235d11124d06ec940c5be9a2edbe85c83
2022-04-28 13:20:44 -07:00
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