Gets the prefix used for prefixing JMX names.
Gets the prefix used for prefixing JMX names. If a single ActorSystem is used, this function returns empty string
unless explicitly configured with squbs.prefix-jmx-name = true. If multiple actor systems are detected, the first
(which could be indeterministic) will use no prefix. Subsequent JMX registration of the same component will
be prefixed with the ActorSystem name.
Note: prefix derivation may not be reliable on concurrent access. If intending to use multiple ActorSystems, it is more reliable to set configuration squbs.prefix-jmx-name = true
The caller's ActorSystem
The ActorSystem's name or empty string dependent on configuration and conflict.