+| Questions | End-user initiated DNS questions |
+| Out-queries | Recursor initiated questions to other
+nameservers |
+| Throttled | If a certain nameserver is not responding, or if
+it is, but returning unuseful answers, it is not useful to keep repeating
+identical queries. If PowerDNS prevents a duplicate query, and therefore
+prevents needless server load and delays, this is called a 'throttled
+out-query' |
+| Outgoing timeout | An out-query that did not generate an
+answer within 1 or 2 seconds |
+| Noerror answer | A Question that was answered without an error
+status |
+| NXDOMAIN answer | A Question that was answered with a positive
+indication that there is no answer |
+| SERVFAIL answer | No answer could be given because the nameservers
+carrying the answer did not respond, or were throttled |
+| Cache hits/misses | A query is judged a cache-hit if it could
+be answered without generating any out-queries |
+| User/System CPU usage | Actual amount of CPU used exclusively
+by the recursor, either in user or in system (kernel) mode |
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