setLevel static method
Sets the minimum level of the logger name and of the loggers below
it (a.b also applies to a.b.c); null makes it inherit again.
Configuration does the same with logging.level.<name>.
Implementation
static void setLevel(String name, SpringLogLevel? level) {
if (level == null) {
_levels.remove(name);
} else {
_levels[name] = level;
}
_effective.clear();
}