Support for RCODE metrics

[christian-simmen]

Hi,

Bind XML statistics version 3.8 supports counters for RCODES.

<statistics version="3.8">
<server>
    <counters type="rcode">
        <counter name="NOERROR">989812</counter>
        <counter name="FORMERR">0</counter>
        <counter name="SERVFAIL">135</counter>
        <counter name="NXDOMAIN">33958</counter>
        <counter name="NOTIMP">0</counter>
        <counter name="REFUSED">123</counter>
        <counter name="YXDOMAIN">0</counter>
        <counter name="YXRRSET">0</counter>
        <counter name="NXRRSET">0</counter>
        <counter name="NOTAUTH">0</counter>
        <counter name="NOTZONE">0</counter>
        <counter name="RESERVED11">0</counter>
        <counter name="RESERVED12">0</counter>
        <counter name="RESERVED13">0</counter>
        <counter name="RESERVED14">0</counter>
        <counter name="RESERVED15">0</counter>
        <counter name="BADVERS">0</counter>
        <counter name="17">0</counter>
        <counter name="18">0</counter>
        <counter name="19">0</counter>
        <counter name="20">0</counter>
        <counter name="21">0</counter>
        <counter name="22">0</counter>
        <counter name="BADCOOKIE">0</counter>
    </counters>
</server>

Can you please add them to the exported values?

Best,
Christian