domain
A well-defined domain (e.g. kmp-log:log), or null. Log implementations may use this for filtering via Log.isLoggable.
The intended purpose of the domain API is for libraries, multi-system or multi-module codebases, etc. A domain helps prevent tag clashes with end-user Logger instances, aids with more quickly identifying the general area where logs originated from, and provides the end-user with more refined control over what (if any) logs are generated for a given domain.