Не описаны все опции из index:stat

В index:stat описаны не все поля, которые отдаются в ответ
https://www.tarantool.io/en/doc/latest/reference/reference_lua/box_index/stat/

Часть из них имеет смысл описать, например get и cache.get

tarantool> box.space.vinyl_space.index.pk:stat()
---
- latency:
    p99: 1e-06
    p95: 1e-06
    p90: 1e-06
    p75: 1e-06
    p50: 1e-06
  range_count: 1
  lookup: 0
  cache:
    invalidate:
      rows: 0
      bytes: 0
    index_size: 0
    rows: 0
    evict:
      rows: 0
      bytes: 0
    put:
      rows: 0
      bytes: 0
    lookup: 0
    bytes: 0
    get:
      rows: 0
      bytes: 0
  run_histogram: '[0]:1'
  disk:
    last_level:
      bytes_compressed: 0
      pages: 0
      rows: 0
      bytes: 0
    rows: 0
    statement:
      inserts: 0
      replaces: 0
      upserts: 0
      deletes: 0
    dump:
      input:
        rows: 0
        bytes: 0
      time: 0
      output:
        bytes_compressed: 0
        pages: 0
        rows: 0
        bytes: 0
      count: 0
    bloom_size: 0
    index_size: 0
    iterator:
      read:
        bytes_compressed: 0
        pages: 0
        rows: 0
        bytes: 0
      bloom:
        hit: 0
        miss: 0
      lookup: 0
      get:
        rows: 0
        bytes: 0
    compaction:
      input:
        bytes_compressed: 0
        pages: 0
        rows: 0
        bytes: 0
      queue:
        bytes_compressed: 0
        pages: 0
        rows: 0
        bytes: 0
      time: 0
      output:
        bytes_compressed: 0
        pages: 0
        rows: 0
        bytes: 0
      count: 0
    pages: 0
    bytes_compressed: 0
    bytes: 0
  range_size: 134217728
  rows: 0
  run_avg: 0
  dumps_per_compaction: 0
  upsert:
    squashed: 0
    applied: 0
  bytes: 0
  put:
    rows: 0
    bytes: 0
  skip:
    rows: 0
    bytes: 0
  run_count: 0
  txw:
    bytes: 0
    rows: 0
    iterator:
      lookup: 0
      get:
        rows: 0
        bytes: 0
  memory:
    bytes: 0
    index_size: 0
    rows: 0
    iterator:
      lookup: 0
      get:
        rows: 0
        bytes: 0
  get:
    rows: 0
    bytes: 0
...

Документация на них упростит их добавление в метрики: https://github.com/tarantool/metrics/issues/522

Start with the box.index:stat() reference page linked in the issue and compare its documented fields with the example response. Describe the relevant missing options, including fields such as get and cache.get, so the returned statistics are covered well enough to support the metrics work referenced in tarantool/metrics#522.