{
  "observation": "matched-visibility-wave",
  "snapshots": [
    {
      "watermark": 3,
      "entries": [
        {
          "eventId": "visibility-0",
          "seq": 2,
          "consequenced": true
        },
        {
          "eventId": "visibility-1",
          "seq": 3,
          "consequenced": true
        }
      ],
      "log": [
        "A",
        "B"
      ]
    }
  ],
  "counters": {
    "waves": 1,
    "derivedCommits": 1,
    "wavesBudgetExhausted": 0,
    "visibilityBarriers": 1,
    "visibilityRecoveries": 1,
    "visibilityDeferrals": 0,
    "deferredRescansArmed": 0,
    "deferredRescansFired": 0
  }
}