}

    public static class JvmMemoryHeapObj {
        public long used;
        public long committed;
        public long max;
        public short percent;
    }

    public static class JvmMemoryNonHeapObj {
        public long used;
        public long committed;
        public long max;
        public short percent;
    }

    public static class JvmPoolObj {

        final Mem mem = jvmStats.getMem();
        buf.append("\"memory\":{");
        buf.append("\"heap\":{");
        append(buf, "used", () -> mem.getHeapUsed().getBytes()).append(',');
        append(buf, "committed", () -> mem.getHeapCommitted().getBytes()).append(',');
        append(buf, "max", () -> mem.getHeapMax().getBytes()).append(',');
        append(buf, "percent", () -> mem.getHeapUsedPercent());
        buf.append("},");