This gxlog is a simplified version of gxlog/gxlog.
+----------------------------------------------------------------+
| Logger |
| Level [Filter] |
| Record |
| | +-------+------------------------------------------------+ |
| |-| Slot0 | Formatter Writer Level [Filter] [ErrorHandler] | |
| | +-------+------------------------------------------------+ |
| |-| ... | ... | |
| | +-------+------------------------------------------------+ |
| \-| Slot7 | Formatter Writer Level [Filter] [ErrorHandler] | |
| +-------+------------------------------------------------+ |
+----------------------------------------------------------------+