Look in Monitoring the storage system --> Managing AutoSupport --> AutoSupport Options
autosupport.noteto sends a very short e-mail that just contains the AutoSupport subject line to the listed e-mail recipients. It is potentially filtered (see: autosupport triggers)
autosupport.partner.to sends complete AutoSupport messages to the listed e-mail recipients. It is not filtered (same ASUP messages as one sent to NetApp Support)
autosupport.performance_data.doit is a command to collect performance statistics and send as PERFORMANCE SNAPSHOT AutoSupport messages, on-demand. Similar in concept to the autosupport.doit command that sends USER_TRIGGERED AutoSupport messages.
autosupport.performance_data.enable controls whether PERFORMANCE DATA is sent to NetApp Support and partner.to destinations (except there's a bug with partner.to).