code: @Trivial
      final String getIdentifier(String policyExecutorIdentifier) {
          return policyExecutorIdentifier.startsWith("managed") //
                          ? policyExecutorIdentifier //
                          : new StringBuilder(name.get()).append(" (").append(policyExecutorIdentifier).append(')').toString();
      }
docs: Utility method to compute the identifier to be used in combination with the specified policy executor identifier.
  We prepend the managed executor name if it isn't already included in the policy executor's identifier.
  
  @param policyExecutorIdentifier unique identifier for the policy executor. Some examples:
  concurrencyPolicy[longRunningPolicy]
  managedExecutorService[executor1]/longRunningPolicy[default-0]
  @return identifier to use in messages and for matching of tasks upon shutdown.