After the upgrade my Zimbra stats and graphs didn't work any more. After some searches i found the right solution:

Log in and stop zimbra process:
su zimbra
zmcontrol stop

Change user:
su root

Checked for processes and killed what was left running:
ps auxww | grep zimbra
ps auxww | grep mysql

Remove old data:
rm -rf /opt/zimbra/logger/db/

Setup directories with correct permissions and access:
mkdir /opt/zimbra/logger/db/
chown -R zimbra:zimbra /opt/zimbra/logger/db/
chmod -R 775 /opt/zimbra/logger/db/

Reset password and database:
/opt/zimbra/libexec/zmloggerinit

Change user:
su zimbra

Start Zimbra:
zmcontrol start

This process has only one inconvenient: the old stats are lost.... :(

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