> The nearest thing I've found to documentation on ntpdc's sysstats is the
> description of the various sysstats from
> http://doc.ntp.org/4.2.4/monopt.html

That looks about right.  If you're into the code, it's in ntp_proto.c
routines receive() and process_packet().  Note that time since restart
and time since reset can be different, if ntpdc is used to reset the
stats counters; and in ntpdc sysstats they are in seconds not hours.

> This suggests that packets received is a total, including responses to
> queries we've sent. So should I be looking at packets received - packets
> processed?

Probably, but for an active pool server the packets processed will
likely be a small fraction of packets received -- on mine, it's 0.15%.
The various "bad" stats could probably be subtracted too.

> And is packet the same as query?

Again the number that are not is likely to be a small proportion,
things like ntpq or ntpdc requests.  I think ntpdc ctlstats counts
some of those.

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