Metrics Snapshot

SegmentIndex.metricsSnapshot() exposes a stable, read-only metrics contract for index-level telemetry.

Current fields

• getOperationCount
  Total number of get(...) calls accepted by the index instance.
• putOperationCount
  Total number of put(...) calls accepted by the index instance.
• deleteOperationCount
  Total number of delete(...) calls accepted by the index instance.
• state
  Current SegmentIndexState at snapshot creation time.

Semantics

• Snapshot is immutable.
• Counts are monotonic for one index instance lifetime.
• Counters are process-local and reset when a new index object is created.
• Field values represent observed operation calls, not necessarily durable writes on disk.

Compatibility policy

• Existing fields and meaning are stable and cannot change silently.
• New fields may be added in future versions.
• Consumers should ignore unknown fields for forward compatibility.