Is there anyway to get alert for new ERROR/exceptions?

[See0]

Hello, is there anyway to get an alert for the new errors/exceptions that never happened before?

More like let say that i have 10 errors/exceptions that happened before can i get an alert only for the new ones?

Also for the known exceptions is possible to do a threshold?

I will attach my type of logs.

[ITWhisperer]

You could count the occurrences of each error since the beginning of time and filter where the count is one.