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nsd 4.8 stats with implausible spikes · Issue #313 · NLnetLabs/nsd · GitHub
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Description
With nsd 4.8 we see unexplainable spikes from the num.rcode and num.type metrics.
The spikes seem to appear at a fixed frequency. The data is implausible in the context of other networking metrics for the system (such as the overall number of packets). Also, the spikes do not show up for nsd 4.7 on a comparable system.
(Graph from graphana, data comes from a custom crawler that queries nsd-control stats every 30 seconds or so)
I'd assume that this has something to do with the changes introduced in #305 but I lack the understanding of C to pinpoint anything.
NSD version 4.8.0
Written by NLnet Labs.
Configure line: --build=x86_64-linux-gnu --prefix=/usr --includedir=${prefix}/include --mandir=${prefix}/share/man --infodir=${prefix}/share/info --sysconfdir=/etc --localstatedir=/var --disable-option-checking --disable-silent-rules --libdir=${prefix}/lib/x86_64-linux-gnu --runstatedir=/run --disable-maintainer-mode --disable-dependency-tracking --with-configdir=/etc/nsd --with-nsd_conf_file=/etc/nsd/nsd.conf --with-pidfile=/run/nsd/nsd.pid --with-dbfile=/var/lib/nsd/nsd.db --with-zonesdir=/etc/nsd --with-xfrdfile=/var/lib/nsd/xfrd.state --disable-largefile --disable-recvmmsg --enable-root-server --enable-mmap --enable-ratelimit --enable-zone-stats --enable-systemd --enable-checking --enable-dnstap
Event loop: libevent 2.1.12-stable (uses epoll)
Linked with OpenSSL 1.1.1w 11 Sep 2023
Copyright (C) 2001-2020 NLnet Labs. This is free software.
There is NO warranty; not even for MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE.
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