def METHOD_NAME():
    """
    ---
    get:
      summary: Suggest users matching a search prefix
      description: >-
        For a given `prefix`, suggest matching user accounts. For
        security reasons, the prefix must be more than three
        characters long.
      parameters:
      - in: query
        name: prefix
        required: true
        schema:
          type: string
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                type: object
                allOf:
                - $ref: '#/components/schemas/QueryResponse'
                properties:
                  results:
                    type: array
                    items:
                      $ref: '#/components/schemas/Role'
      tags:
      - Role
    """
    require(request.authz.logged_in)
    parser = QueryParser(request.args, request.authz, limit=10)
    if parser.prefix is None or len(parser.prefix) < 3:
        # Do not return 400 because it's a routine event.
        return jsonify(
            {
                "status": "error",
                "message": gettext("prefix filter is too short"),
                "results": [],
                "total": 0,
            }
        )
    # this only returns users, not groups
    exclude = ensure_list(parser.excludes.get("id"))
    q = Role.by_prefix(parser.prefix, exclude=exclude)
    result = DatabaseQueryResult(request, q, parser=parser)
    return RoleSerializer.jsonify_result(result)