code: protected EntryMessage enter(final String fqcn, final Message message) {
          EntryMessage flowMessage = null;
          if (isEnabled(Level.TRACE, ENTRY_MARKER, (Object) null, null)) {
              logMessageSafely(fqcn, Level.TRACE, ENTRY_MARKER, flowMessage = flowMessageFactory.newEntryMessage(message),
                      null);
          }
          return flowMessage;
      }
docs: Logs entry to a method with location information.
  
  @param fqcn
  The fully qualified class name of the <b>caller</b>.
  @param message
  the Message.
  @since 2.6