Alerts are crucial in IT and security operations. They provide proactive awareness of the state of the systems to those persons who monitor and control them. Alerts enable you to act fast when an issue has been detected, as opposed to waiting for a user to run a report and find the issue, which may or may not happen. In today's world, every minute someone has breached your network is costly and potentially devastating.
However, alerts are only good if they are controlled and if they provide enough actionable information. They should not be created on low-priority items or triggered too often to the point they lose relevance.