This section lists the known behaviors, system maximums, and limitations in hardware and software in Junos OS Release 20.1R1 for cSRX.
Monitoring and Troubleshooting
On cSRX, third-party code rsyslog daemon is used. By default, it will check every 15 minutes to see if there is a need to do rotation. During this period, if there are more logs, then the log file will exceed the size you configured. Set the rotation check frequency to 1 minute instead of 15 minutes using the set system syslog log-rotate-frequency 1 command. Doing so will reduce the chances of log file exceeding the configured file size. PR1465976