Hi,
it depends on which logs you manage. and what are you sending
LTM: you can check audit logs and security logs:
https://support.f5.com/csp/article/K16197
You can also check in lTM logs reaping logs (due to excessive conssomation of memory and potentially a bug, an attack or other ...)
https://support.f5.com/csp/article/K15740
You can also configure a request logging on your VS to check some response logs (status 403...):
https://support.f5.com/kb/en-us/products/big-ip_ltm/manuals/product/bigip-external-monitoring-implementations-12-0-0/3.html
For ASM it's all logs security you can manage it on dashboard or on your SIEM....
Let me know if you need more details.
regards,