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## Problem Location config changes can currently result in changes to the shard identity. Such changes will cause data corruption, as seen with #12217. Resolves #12227. Requires #12377. ## Summary of changes Assert that the shard identity does not change on location config updates and on (re)attach. This is currently asserted with `critical!`, in case it misfires in production. Later, we should reject such requests with an error and turn this into a proper assertion.