With a hierarchy browser I meant a tool that shows all used loggers and let you set a specific log level for each logger or higher hierarchy levels (e.g. “smarthome.event” or “org.openhab”).
There isn’t even a static documentation available for existing loglevels.
And the logging hierarchy is not consistent. Some are based on package name following the Java package name rules (e.g. org.openhab), other omit the high level names (e.g. smarthome instead of org.eclipse.smarthome).
So to get the experience to know the logger hierarchy, you need to be a developer for openhab core or bindings, not just a user that wants to develop own rules.