code: protected EntryMessage enter(final String fqcn, final String format, final Supplier<?>... paramSuppliers) {
          EntryMessage entryMsg = null;
          if (isEnabled(Level.TRACE, ENTRY_MARKER, (Object) null, null)) {
              logMessageSafely(fqcn, Level.TRACE, ENTRY_MARKER, entryMsg = entryMsg(format, paramSuppliers), null);
          }
          return entryMsg;
      }
docs: Logs entry to a method with location information.
  
  @param fqcn The fully qualified class name of the <b>caller</b>.
  @param format Format String for the parameters.
  @param paramSuppliers The Suppliers of the parameters.