my $config = Munin::Master::Config->instance;
Returns the (possibly newly created) singleton configuration instance.
Set a value in the config, where $longkey is the full ;:. separated value.
Populates the fields of $config from the configuration file referred to by filehandle $io.
my $value = $config->look_up($key);
Look up a group/host by a key such as ``localdomain;localhost'' etc. If the path does not exist create it with correct class and so on.
Lookup ends at host name. If something is missing along the way undef is returned.
my $gah = $config->get_groups_and_hosts();
Returns all the groups and hosts defined in the configuration.
my $hosts = $config->get_all_hosts();
Returns a list of all the hosts defined in the configuration.
Sets the keys and values in $config to those in %attrs.