3.0.0 upgrade notes seem to miss a few things :

• they mention configuration -> maps not being there anymore, but nothing on screens/slideshows
• they do not seem to mention that no entities are not denoted with a 0 anymore but with nothing instead (for example, in configuration -> hosts, if host has no items, no "(0)" is shown anymore). this change has not been mentioned anywhere, but given that developers are not much into documenting what is changed, it is likely here to stay