docs: public void prepare(ResponseBuilder rb, ComponentFields mtasFields)
        throws IOException {
      if (rb.req.getParams().getBool(PARAM_MTAS_STATS_POSITIONS, false)) {
        preparePositions(rb, mtasFields);
      }
      if (rb.req.getParams().getBool(PARAM_MTAS_STATS_TOKENS, false)) {
        prepareTokens(rb, mtasFields);
      }
      if (rb.req.getParams().getBool(PARAM_MTAS_STATS_SPANS, false)) {
        prepareSpans(rb, mtasFields);
      }
    }