After investigating some cuestions from a client we noticed that there is a configuration for the Cortex TSS Plugin that is not supported. 

https://docs.opennms.com/horizon/30/deployment/time-series-storage/timeseries/cortex.html#deployment

Basically the line

org.opennms.timeseries.tin.metatags.tag.label=${resource:label}

is not currently supported since the plugin only tracks in Cortex the tags defined here

https://github.com/OpenNMS/opennms/blob/develop/core/mate/model/src/main/java/org/opennms/core/mate/model/EntityScopeProviderImpl.java#L109

end here 

https://github.com/OpenNMS/opennms/blob/develop/core/mate/model/src/main/java/org/opennms/core/mate/model/EntityScopeProviderImpl.java#L127