mutation SetGitLabDiscussionResolved($input: GitLabDiscussionInput!, $resolved: Boolean!) {
  setGitLabDiscussionResolved(input: $input, resolved: $resolved) {
    id
    individualNote
    notes {
      id
      webUrl
      filePath
      oldLine
      newLine
      body
    }
  }
}

{
  "input": {
    "projectId": "id",
    "iid": 1,
    "discussionId": "id"
  },
  "resolved": true
}

{
  "data": {
    "setGitLabDiscussionResolved": {
      "id": "id",
      "individualNote": true,
      "notes": [
        {
          "id": "id",
          "webUrl": "string",
          "filePath": "string",
          "oldLine": 1,
          "newLine": 1,
          "body": "string"
        }
      ]
    }
  }
}