SegmentSummary
class SegmentSummary
What an observer is told about a finished segment.
Deliberately not SegmentMetadata, which is internal and carries the key range the version set routes on — an observer has no business with the shape of the tree, only with the file it was just shown.
Properties
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Distinct user keys, which is how many times SegmentObservation.observe was called.
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Versions written, counting superseded ones and tombstones.
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The segment's file number.