Key Alerting Metrics
Good alerting is critical to operating a SaaS (or any other software) platform. Good alerts are timely, actionable, understandable, and correct. In this context, correct means minimizing false positives (alerting when there is not an issue) and false negatives (not firing when there is an issue).
Key Alerting Metrics are four metrics to monitor a whole system, subsystem, or microservice based on customer pain which all production engineers can understand.