There are three built-in HTTProviders:
http://[wowza-address]:8068/connectioninfo
http://[wowza-address]:8068/connectioncounts
http://[wowza-address]:8068/serverinfo
You need to set a username/password in the /conf/admin.password file to access these pages.
To customize, you can start here:
http://community.wowza.com/t/-/60
Richard