Martin,
I have executed below commands for solution manager alerts.
grant execute on schema _SYS_STATISTICS to SOLMANUSER
grant update on _SYS_STATISTICS.STATISTICS_SCHEDULE to SOLMANUSER
and when I check in DBA cockpit of Solution Manager it still doesnot recoginze the statistics server exists.
In the below screen Alerts is disabled
Below are warining messages
Regards,
Dheeraj