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