I noticed on another deployment of IBM Connections 5.5 which includes Solr (Type Ahead Search) the Admin dashboard reported less information as before. The difference is that I used the JRE with WebSphere.
It seems that the output provided in the dashboard is less when using the JRE with WebSphere. There is no stipulation of which JRE should be used but it seems sensible to install Oracle Java since some of the data is missing. Take a look at the screen shots below.