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* The format for SegmentedLog's metadata files.
* The version of the storage module that created this file. If an older storage module finds a newer format version here, it will PANIC.
* Each time metadata is written, this number is incremented. Odd versions are stored in the file named metadata1, and even versions are stored in the file named metadata2.
* Metadata from Raft, including the current term and vote.
* The log start index.