Statistics

dnsdist keeps statistics on the queries is receives and send out. They can be accessed in different ways:

To make sense of the statistics, the following relation should hold:

queries - noncompliant-queries = responses - noncompliant-responses + cache-hits + downstream-timeouts + self-answered + no-policy + rule-drop

Note that packets dropped by eBPF (see eBPF Socket Filtering) are accounted for in the eBPF statistics, and do not show up in the metrics described on this page.

acl-drops

The number of packets (or TCP messages) dropped because of the ACL. If a packet or message is dropped, it is not counted in the queries statistic.

cache-hits

Number of times a response was sent using data found in the packet cache.

cache-misses

Number of times an answer was not found in the packet cache. Only counted if a packet cache was setup for the selected pool.

cpu-iowait

New in version 1.5.0.

Time spent waiting for I/O to complete by the whole system, in units of USER_HZ.

cpu-steal

New in version 1.5.0.

Stolen time, which is the time spent by the whole system in other operating systems when running in a virtualized environment, in units of USER_HZ.

cpu-sys-msec

Milliseconds spent by dnsdist in the “system” state.

cpu-user-msec

Milliseconds spent by dnsdist in the “user” state.

doh-query-pipe-full

Number of queries dropped because the internal DoH pipe was full.

doh-response-pipe-full

Number of responses dropped because the internal DoH pipe was full.

downstream-send-errors

Number of errors when sending a query to a backend.

downstream-timeouts

Number of queries not answer in time by a backend.

dyn-block-nmg-size

Number of dynamic blocks entries.

dyn-blocked

Number of queries dropped because of a dynamic block.

empty-queries

Number of empty queries received from clients. Every empty-query is also counted as a query.

fd-usage

Number of currently used file descriptors.

frontend-noerror

Number of NoError answers sent to clients.

frontend-nxdomain

Number of NXDomain answers sent to clients.

frontend-servfail

Number of ServFail answers sent to clients.

latency-avg100

Average response latency in microseconds of the last 100 packets

latency-avg1000

Average response latency in microseconds of the last 1000 packets.

latency-avg10000

Average response latency in microseconds of the last 10000 packets.

latency-avg1000000

Average response latency in microseconds of the last 1000000 packets.

latency-bucket

Histogram of response time latencies.

latency-count

Number of queries contributing to response time histogram and latency sum.

latency-doh-avg100

Average response latency, in microseconds, of the last 100 packets received over DoH.

latency-doh-avg1000

Average response latency, in microseconds, of the last 1000 packets received over DoH.

latency-doh-avg10000

Average response latency, in microseconds, of the last 10000 packets received over DoH.

latency-doh-avg100000

Average response latency, in microseconds, of the last 100000 packets received over DoH.

latency-dot-avg100

Average response latency, in microseconds, of the last 100 packets received over DoT.

latency-dot-avg1000

Average response latency, in microseconds, of the last 1000 packets received over DoT.

latency-dot-avg10000

Average response latency, in microseconds, of the last 10000 packets received over DoT.

latency-dot-avg1000000

Average response latency, in microseconds, of the last 1000000 packets received over DoT.

latency-slow

Number of queries answered in more than 1 second.

latency-sum

Total response time of all queries combined in milliseconds since the start of dnsdist. Can be used to calculate the average response time over all queries.

latency-tcp-avg100

Average response latency, in microseconds, of the last 100 packets received over TCP.

latency-tcp-avg1000

Average response latency, in microseconds, of the last 1000 packets received over TCP.

latency-tcp-avg10000

Average response latency, in microseconds, of the last 10000 packets received over TCP.

latency-tcp-avg1000000

Average response latency, in microseconds, of the last 1000000 packets received over TCP.

latency0-1

Number of queries answered in less than 1 ms.

latency1-10

Number of queries answered in 1-10 ms.

latency10-50

Number of queries answered in 10-50 ms.

latency50-100

Number of queries answered in 50-100 ms.

latency100-1000

Number of queries answered in 100-1000 ms.

no-policy

Number of queries dropped because no server was available.

noncompliant-queries

Number of queries dropped as non-compliant.

noncompliant-responses

Number of answers from a backend dropped as non-compliant.

outgoing-doh-query-pipe-full

Number of outgoing DoH queries dropped because the internal pipe used to distribute queries was full.

proxy-protocol-invalid

New in version 1.6.0.

Number of queries dropped because of an invalid Proxy Protocol header.

queries

Number of received queries.

rdqueries

Number of received queries with the recursion desired bit set.

real-memory-usage

Current memory usage.

responses

Number of responses received from backends. Note! This is not the number of responses sent to clients. To get that number, add ‘cache-hits’ and ‘responses’.

rule-drop

Number of queries dropped because of a rule.

rule-nxdomain

Number of NXDomain answers returned because of a rule.

rule-refused

Number of Refused answers returned because of a rule.

rule-servfail

Number of ServFail answers returned because of a rule.

rule-truncated

New in version 1.6.0.

Number of truncated answers returned because of a rule.

security-status

The security status of dnsdist. This is regularly polled.

  • 0 = Unknown status or unreleased version
  • 1 = OK
  • 2 = Upgrade recommended
  • 3 = Upgrade required (most likely because there is a known security issue)

self-answered

Number of self-answered responses.

servfail-responses

Number of servfail answers received from backends.

tcp-cross-protocol-query-pipe-full

Number of TCP cross-protocol queries dropped because the internal pipe used to distribute queries was full.

tcp-cross-protocol-response-pipe-full

Number of TCP cross-protocol responses dropped because the internal pipe used to distribute queries was full.

tcp-listen-overflows

New in version 1.6.0.

From /proc/net/netstat ListenOverflows.

tcp-query-pipe-full

Number of TCP queries dropped because the internal pipe used to distribute queries was full.

trunc-failures

Number of errors encountered while truncating an answer.

udp-in-csum-errors

New in version 1.7.0.

From /proc/net/snmp InErrors.

udp-in-errors

New in version 1.5.0.

From /proc/net/snmp InErrors.

udp-noport-errors

New in version 1.5.0.

From /proc/net/snmp NoPorts.

udp-recvbuf-errors

New in version 1.5.0.

From /proc/net/snmp RcvbufErrors.

udp-sndbuf-errors

New in version 1.5.0.

From /proc/net/snmp SndbufErrors.

udp6-in-csum-errors

New in version 1.7.0.

From /proc/net/snmp6 InErrors.

udp6-in-errors

New in version 1.7.0.

From /proc/net/snmp6 InErrors.

udp6-noport-errors

New in version 1.7.0.

From /proc/net/snmp6 NoPorts.

udp6-recvbuf-errors

New in version 1.7.0.

From /proc/net/snmp6 RcvbufErrors.

udp6-sndbuf-errors

New in version 1.7.0.

From /proc/net/snmp6 SndbufErrors.

uptime

Uptime of the dnsdist process, in seconds.