New Relic Alerts` is a tool that helps DevOps teams ensure they can respond quickly to service issues by automatically notifying the right team members when predefined alert conditions are met. To avoid `alert fatigue`, teams need to manage alert policies and conditions carefully, focusing on key metrics while filtering out expected behavior. The post provides examples of best practices for setting up alert conditions for different types of applications and hosts monitored with New Relic Browser, APM 360, and Infrastructure. It also emphasizes the importance of understanding thresholds and baselines in creating effective alerting strategies.