Mastering ArcGIS Enterprise Administration

Log retention time

Log retention time, or the number of days that logs are kept on disk, is another important log setting in ArcGIS Server. By default, logs are retained on disk for 90 days. When a log file becomes older than 90 days, it is deleted by ArcGIS Server. Your organization may have standard operating procedures (SOPs) in place that determine the lifespan of your logs; consult with your systems administrator if you are unsure of how long your organization may want to keep the ArcGIS Server logs for auditing purposes.

Log retention time can be used in conjunction with log level to keep your log directory from growing too large. If your organization requires verbose logging, perhaps you can lower the log retention time to 30 days ...