Sizing guidelines: What part of the document is "value_size"

Link to docs: https://docs.couchbase.com/server/5.5/install/sizing-general.html#sizing-data-service-nodes
There is a box with “value_size” and the example size is 10,000. Does value_size mean the whole document, i.e. the example document would have 10,000 characters? If not which parts are included in “value_size”?

Thanks!

{
  "_sync": {
    "rev": "11-022d...",
    "sequence": 169,
    "recent_sequences": [
      131,
      135,
      137
    ],
    "history": {
      "revs": [
        "1-a346e...",
        "4-91066...",
        "5-208c8..."
      ],
      "parents": [
        -1,
        3,
        1
      ],
      "channels": [
        [
          "HcN2UI..."
        ],
                [
          "HcN2UI..."
        ],
        [
          "HcN2UI..."
        ]
      ]
    },
    "channels": {
      "HcN2UI...": null
    },
    "time_saved": "2018-10-26T09:56:04.257921477+02:00"
  },
  "channels": "HcN2UI...",
  "field_1": 1,
  "field_2": 2
}

Thank you raising the question. I do have the same question if anyone could clarify on this it would be appreciated.

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