• JPA + EJB + RDBMS + logAppender to persist logging is quite legacy way, JPA/Hibernate have performance bottleneck, it also consume high cpu and memory.
• https://www.elastic.co/products/logstash are a popular logging framework used in micro service, big data area, both Wildfly Swarm and Spring boot have support it.

So I think it may helpful to spend some time to investigate the Logstash, to check whether it can repleace current JPA + EJB + RDBMS way