VMware Aria Operations for Logs 8.18.x
VMware NSX 4.x
Logging is disabled by default for Distributed Firewall
Enable logging for firewall rules on NSX Manager:
Note: It is recommended to enable logging for specific rules that you wish to monitor in VMware Aria Operations for Logs as it can impact the performance on the ESXi host
Additional documentation found here: Common Admin- Add a Distributed Firewall