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Azure Monitor Metrics is the time-series database at the heart of Azure monitoring. It collects numerical data from Azure resources at regular intervals, enabling real-time dashboards, trend analysis, and automated alerting. Understanding metrics and alerts is fundamental to operating any Azure workload effectively.
Metrics are lightweight, numerical values collected at regular intervals (typically every minute). They describe the state and performance of a resource at a point in time.
| Property | Description | Example |
|---|---|---|
| Timestamp | When the value was recorded | 2025-03-15T10:30:00Z |
| Name | The metric identifier | Percentage CPU |
| Value | The numerical measurement | 73.5 |
| Dimensions | Key-value pairs for filtering | Instance=web-01, Region=uksouth |
| Aggregation | How values are summarised | Average, Sum, Count, Min, Max |
| Type | Source | Cost |
|---|---|---|
| Platform metrics | Automatically collected from Azure resources | Free (standard retention) |
| Custom metrics | Sent from your application or agents | Charged per metric time-series ingested |
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