If you are monitoring the system but not its users, then that is not collecting PII. To be completely sure, you should eliminate anything that might be conside

If you are monitoring the system but not its users, then that is not collecting PII. To be completely sure, you should eliminate anything that might be considered PII. So unadorned exception counts would be anonymous, aggregated statistics, which is fine. But exception counts reports per IP address, or per session, or where the exception text mentioned the user's PII, would require consent from the user you're tracking by processing that data about them.