SLF4J 2.0 was released in August of 2022. According to the manual the upgrade should be backwards compatible for users. Implementations, org.jboss.logging:slf4j-jboss-logmanager in the case of WildFly, will need to be updated however. With this JIRA a new release of org.jboss.logging:slf4j-jboss-logmanager will be required as well.

We do not support logback so any user using logback would be required to provide their own version of the slf4j-api.

SLF4J
Tag: https://github.com/qos-ch/slf4j/releases/tag/v_2.0.6
Diff: https://github.com/qos-ch/slf4j/compare/v_1.7.36...v_2.0.6

slf4j-jboss-logmanager
Tag; https://github.com/jboss-logging/slf4j-jboss-logmanager/releases/tag/2.0.0.Final
Diff: https://github.com/jboss-logging/slf4j-jboss-logmanager/compare/1.1.0.Final...2.0.0.Final