Take a look at the /conf/Server.xml /AdminInterface /ObjectList
You can add MediaStream to the list. It’s not in the default ObjectList because of added overhead.
To get a rolling history of past streams you have to capture that data over time.
One way is with HTTProvider, to get data with a server page and insert into a database:
http://community.wowza.com/t/-/60
Another way is log to a database:
http://community.wowza.com/t/-/236
Richard