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stats: Add zeek-net-packet-lag-seconds metric

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While writing documentation about troubleshooting and looking a bit
at the older stats.log, realized we don't have the packet lag metric
exposed as metric/telemetry. Add it.

This is a Zeek instance lagging behind in network time ~6second because
it's very overloaded:

    zeek_net_packet_lag_seconds{endpoint=""} 6.169406 1684848998092
This commit is contained in:
Arne Welzel 2023-05-23 15:33:12 +02:00
parent 614f1a9e5f
commit f396c2b16e
2 changed files with 29 additions and 6 deletions
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12
NEWS
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@ -161,6 +161,18 @@ New Functionality
- Add logging metrics for streams (``zeek-log-stream-writes``) and writers
(``zeek-log-writer-writes-total``).
- Add networking metrics via the telemetry framework. These are enabled
when the ``misc/stats`` script is loaded.
zeek-net-dropped-packets
zeek-net-link-packets
zeek-net-received-bytes
zeek-net-packet-lag-seconds
zeek-net-received-packets-total
Except for lag, metrics originate from the ``get_net_stats()`` bif and are
updated through the ``Telemetry::sync()`` hook every 15 seconds by default.
- The DNS analyzer now parses RFC 2535's AD ("authentic data") and CD ("checking
disabled") flags from DNS requests and responses, making them available in
the ``dns_msg`` record provided by many of the ``dns_*`` events. The existing