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Add NEWS entry for field length limiting

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Tim Wojtulewicz 2025-08-12 16:03:05 -07:00
parent 39814816af
commit a1c201fb8f
1 changed files with 26 additions and 0 deletions
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26
NEWS
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@ -21,6 +21,32 @@ New Functionality
been added to allow observing ``Subscribe()`` and ``Unsubscribe()`` calls on been added to allow observing ``Subscribe()`` and ``Unsubscribe()`` calls on
backends by Zeek scripts. backends by Zeek scripts.
- The ability to control the length of strings and containers in log output was added. The
maximum length of individual log fields can be set, as well as the total length of all
string or container fields in a single log record. This feature is controlled via four
new script-level variables:
Log::default_max_field_string_bytes
Log::default_max_total_string_bytes
Log::default_max_field_container_elements
Log::default_max_total_container_elements
When one of the ``field`` limits is reached, the individual field is truncated. When one
of the ``total`` limits is reached, all further strings will returned as empty and all
further container elements will not be output. See the documentation for those variables
for more detail.
The above variables control the truncation globally, but they can also be set for log
streams individually. This is controlled by variables with the same names that can be
set when the log stream is created.
Two new weirds were added to report the truncation: ``log_string_field_truncated`` and
``log_container_field_truncated``. New metrics were added to track how many truncations
have occurred: ``zeek_log_writer_truncated_string_fields_total`` and
``zeek_log_writer_truncated_containers_total``. The metrics are reported for each log
stream.
Changed Functionality Changed Functionality
--------------------- ---------------------