Kevin,
PERFORMANCE DATA and MANAGEMENT LOG is now sent daily, in order to smooth out the Sunday traffic and minimize the potential for information being truncated in the WEEKLY LOG.
WEEKLY LOG no longer contains any log files. They are sent exclusively by MANAGEMENT LOG daily.
MANAGEMENT LOG is very important for NetApp to receive for system diagnosis during technical cases, as well as for detection of system risks.
PERFORMANCE DATA is required for performance trending and to provide the performance graphs in My AutoSupport.
NetApp recommends that you allow both to be sent daily.
MANAGEMENT LOG cannot be individually controlled for sending to NetApp.
PERFORMANCE DATA can be controlled by the "options autosupport.performance_data.enable" command.
Are you specifying e-mail addresses via "autosupport.partner.to"?
If that is how you are seeing these AutoSupport e-mails, then see Bug 605902
http://support.netapp.com/NOW/cgi-bin/bol?Type=Detail&Display=605902
This bug describes a regression where partner.to e-mail destinations always receive PERFORMANCE DATA, regardless of the options setting.