Sending the whole payload over regular syslog may be a sticking point given protocol limitations. , ADM uses Logstream and NSWL uses its own protocol I believe (haven't had a use case for that before). v13 has the ability to mirror decrypted traffic somewhere else, typically used for IDS/IPS deployments, but i'm not sure how Splunk ingest would work. I don't know if the Splunk NetScaler app has the ability to get that data but it may be worth reaching out to them to see.