1. Select Container (the other one is Fabric) view in Hawtio.\
2. Go to Preferences - Plugins.
3. Select Fabric from selectbox.
Wiki plugin is not there. This is wrong.
But if you display Fabric view (not the selectbox option but link in dropdown menu at the right upper corner of the page) and then navigate to the same Plugins page in Profiles, Wiki page is there, which is correct.