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# Alert Types and Use Cases

## Alert Types and Use Cases

**Purpose:** Define the criteria for triggering alerts based on data patterns.

* **Threshold Alert**
  Triggers when a metric or log event crosses a predefined threshold (e.g., CPU usage > 80%).
  Use case: Detecting performance anomalies or resource exhaustion.

* **Change Alert**
  Activates when a metric or event changes by a specified percentage or absolute value (e.g., a 20% increase in error rates).
  Use case: Identifying sudden fluctuations or trends.

* **Absence Alert**
  Fires when a metric or event fails to occur within a defined timeframe (e.g., no logs for 5 minutes).
  Use case: Monitoring system availability or expected activity.