After ZBX-4131 success API logins is somehow auditing.
But it's only for 1.8 branch, current trunk (pre 2.0) doesn't.
It's:
1) inconsistency (should be added to 2.0 as well)
or
2) should not auditing because almost all API actions are not auditing.
An opposite issue to 2) is ZBX-4842