It must not be possible to instantiate the stats receiver more than once

[sklirg]

The stats receiver listens for stats on a global channel. If multiple receivers subscribe to it, using different configurations, stats will get split up and sent to different places. This is probably not the expected behaviour. There is no filtering mechanism on the channel, so a receiver cannot listen for only a specific type of stats either (though, this could be a feature in itself).

For now, it must be impossible to instantiate the stats receiver more than once. It must error before Skogul starts, i.e. during configuration.