To set up an ArubaOS-Switch to send logs to a SIEM syslog server at the specified criteria, you would need to specify the level of events that should be logged. Since the requirement is to log all events at the "warning" level or above, you should specify the syslog level after the logging server IP and port. The command should look like this:
ArubaOS-Switch(config)# logging 10.4.13.15 ArubaOS-Switch(config)# logging trap warning This would set up the switch to send logs to the syslog server at the IP address 10.4.13.15 using the default UDP port (514), for all events at the "warning" level or above.