what happens is that the script runs rclone, 7zip, fastcopy, VSS and veeam.
for each run for each server, the script checks for exit codes, scans all the logs, looks for issues and then sends me a summary, with each log as an attachment.
the subject line let's me know if there is an issue and then i can check the logs.
so in your case, i would use a regex to filter out that text. ^\d\d\d\d/\d\d/\d\d \d\d:\d\d:\d\d ERROR : Attempt 2/2
in the past, i also wrote a post similar to yours, about non-error errors.
in the end, nothing changed, so just scripted around it.