https://pekko.apache.org/japi/pekko/current/org/apache/pekko/pattern/ForwardDeathLetters$.html
ForwardDeathLetters$
https://pekko.apache.org/japi/pekko/snapshot/org/apache/pekko/pattern/ForwardDeathLetters.html
ForwardDeathLetters
declaration: package: org.apache.pekko.pattern, class: ForwardDeathLetters