Monitoring Signals¶
Azure provides a comprehensive monitoring solution to track the health and performance of your virtual machines. These signals help you proactively identify and resolve issues before they impact your users.
| Signal Category | Metric/Log Name | Source | Normal Range | Alert Threshold | Tool |
|---|---|---|---|---|---|
| Compute | Percentage CPU | Host | < 70% | > 85% for 15m | Azure Monitor |
| Memory | Available Memory | Guest OS via AMA / VM Insights | > 10% | < 5% | VM Insights |
| Disk IO | Data Disk IOPS | Host | Within SKU limit | > 90% of limit | Azure Monitor |
| Latency | Disk Read/Write Latency | Host | Varies by disk tier | Sustained increase above baseline | VM Insights |
| Network | Network In/Out | Host | Varies by size | > 90% of BW | Azure Monitor |
| Health | VM Availability | Platform | 1 (Available) | < 1 | Resource Health |
| Diagnosis | Boot Diagnostics | Serial/Store | Image/Text | "Failure" string | Serial Console |
| Audit | Activity Log | Resource | Event log | Critical failures | Log Analytics |
graph TD
VM[Virtual Machine] -->|Host Metrics| Monitor[Azure Monitor]
VM -->|Guest Logs/Metrics| Agent[AMA Agent]
Agent -->|Store| LogA[Log Analytics]
Monitor -->|Analyze| Dashboard[Azure Dashboards]
LogA -->|Analyze| Insights[VM Insights]
Monitor -->|Threshold| Alerts[Azure Alerts]
LogA -->|Threshold| AlertsNote
The Azure Monitor Agent (AMA) replaces the legacy Log Analytics agent and provides enhanced security and flexibility for log collection.