No need to HUP any scripts or tweak logrotate.
This is tunable in:
$SPLUNK_HOME/etc/apps/Splunk_CiscoIPS/default/config.ini
[logging]
# Maximum bytes for log's file size before it being rotated.
# If you want no limit on the log's file size, set this value to 0. The log size will keep growing.
# Default to 100MB
maxBytes = 102400000
# Number of backup log files to keep
# If you want no backup file, set this value to 0.
backupCount = 5
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