The default action of the threat prevention profile was to drop the traffic that complied with the signature so you should be ok, however if looking for evidence for log4j traffic a good place to start would either LDAP or rmi traffic going either sourced from or directed to an untrusted network or any network that it shouldn't be, these are the mechanisms by which it was exploited, there is a video here
please let me know if this is of any use.
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