certain alert.log errors from appearing in alerts.
There is example there how to ignore certain errors
from coming to alerts of database.
Unfortunately proposed expression doesn't work - might be some
characters hidden in html code of the page or might be simply missed.
Since it is based on regular expressions there must be clause
to ignore certain patterns using symbol ^.
After some testing I came with the expression like this
that allows to ignore ORA-01111, ORA-02222, ORA-03333 messages.
Also I removed "Generic Alert Log Error Status" metric to elude messages
about ignored errors.
The pattern was tested on EM GC Rel.4 on 10.1.0.4 on Linux.
Have a good day!