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Performance counters provide insight into the performance of virtual hardware components, operating systems, and workloads. Collect counters from both Windows and Linux virtual machines using a data collection rule (DCR) with a Performance Counters data source.
Details for the creation of the DCR are provided in Collect data from VM client with Azure Monitor. This article provides additional details for the Performance Counters data source type.
Note
To work with the DCR definition directly or to deploy with other methods such as ARM templates, see Data collection rule (DCR) samples in Azure Monitor.
Create the DCR using the process in Collect data from virtual machine client with Azure Monitor. On the Collect and deliver tab of the DCR, select Performance Counters from the Data source type dropdown. Select from a predefined set of objects to collect and their sampling rate. The lower the sampling rate, the more frequently the value is collected.
Select Custom to specify an XPath to collect any performance counters not available with the Basic selection. Use the format \PerfObject(ParentInstance/ObjectInstance#InstanceIndex)\Counter.
Tip
If the counter name contains an ampersand (&), replace it with &. For example, \Memory\Free & Zero Page List Bytes.
Warning
Be careful when manually defining counters for DCRs that are associated with both Windows and Linux machines, since some Windows and Linux style counter names can resolve to the same metric and cause duplicate collection. For example, specifying both \LogicalDisk(*)\Disk Transfers/sec (Windows) and Logical Disk(*)\Disk Transfers/sec (Linux) in the same DCR will cause the Disk Transfers metric to be collected twice per sampling period.
This behavior can be avoided by not collecting performance counters in DCRs that don't specify a platform type. Ensure that Windows counters are only included in DCRs associated with Windows machines, and Linux counters are only included in DCRs associated with Linux machines.
Note
Microsoft.HybridCompute (Azure Arc-enabled servers) resources can't currently be viewed in Metrics Explorer, but their metric data can be acquired via the Metrics REST API (Metric Namespaces - List, Metric Definitions - List, and Metrics - List).
Performance counters can be sent to a Log Analytics workspace where it's stored in the Perf table and/or Azure Monitor Metrics (preview) where it's available in Metrics explorer. Add a destination of type Azure Monitor Logs and select a Log Analytics workspace. While you can add multiple workspaces, be aware that this will send duplicate data to each which will result in additional cost. No further details are required for Azure Monitor Metrics (preview) since this is stored at the subscription level for the monitored resource.
Note
For Linux, using Azure Monitor Metrics as the only destination is supported in v1.10.9.0 or higher.
To verify that data is being collected in the Log Analytics workspace, check for records in the Perf table. From the virtual machine or from the Log Analytics workspace in the Azure portal, select Logs and then click the Tables button. Under the Virtual machines category, click Run next to Perf.
To verify that data is being collected in Azure Monitor Metrics, select Metrics from the virtual machine in the Azure portal. Select Virtual Machine Guest (Windows) or azure.vm.linux.guestmetrics for the namespace and then select a metric to add to the view.
The following performance counters are available to be collected by the Azure Monitor Agent for Windows and Linux virtual machines. The sample frequency can be changed when creating or updating the data collection rule.
| Performance counter | Category | Default sample frequency |
|---|---|---|
| Processor(*)\% Processor Time | CPU | 60 |
| Processor(*)\% Idle Time | CPU | 60 |
| Processor(*)\% User Time | CPU | 60 |
| Processor(*)\% Nice Time | CPU | 60 |
| Processor(*)\% Privileged Time | CPU | 60 |
| Processor(*)\% IO Wait Time | CPU | 60 |
| Processor(*)\% Interrupt Time | CPU | 60 |
| Memory(*)\Available MBytes Memory | Memory | 60 |
| Memory(*)\% Available Memory | Memory | 60 |
| Memory(*)\Used Memory MBytes | Memory | 60 |
| Memory(*)\% Used Memory | Memory | 60 |
| Memory(*)\Pages/sec | Memory | 60 |
| Memory(*)\Page Reads/sec | Memory | 60 |
| Memory(*)\Page Writes/sec | Memory | 60 |
| Memory(*)\Available MBytes Swap | Memory | 60 |
| Memory(*)\% Available Swap Space | Memory | 60 |
| Memory(*)\Used MBytes Swap Space | Memory | 60 |
| Memory(*)\% Used Swap Space | Memory | 60 |
| Process(*)\Pct User Time | Memory | 60 |
| Process(*)\Pct Privileged Time | Memory | 60 |
| Process(*)\Used Memory | Memory | 60 |
| Process(*)\Virtual Shared Memory | Memory | 60 |
| Logical Disk(*)\% Free Inodes | Disk | 60 |
| Logical Disk(*)\% Used Inodes | Disk | 60 |
| Logical Disk(*)\Free Megabytes | Disk | 60 |
| Logical Disk(*)\% Free Space | Disk | 60 |
| Logical Disk(*)\% Used Space | Disk | 60 |
| Logical Disk(*)\Logical Disk Bytes/sec | Disk | 60 |
| Logical Disk(*)\Disk Read Bytes/sec | Disk | 60 |
| Logical Disk(*)\Disk Write Bytes/sec | Disk | 60 |
| Logical Disk(*)\Disk Transfers/sec | Disk | 60 |
| Logical Disk(*)\Disk Reads/sec | Disk | 60 |
| Logical Disk(*)\Disk Writes/sec | Disk | 60 |
| Network(*)\Total Bytes Transmitted | Network | 60 |
| Network(*)\Total Bytes Received | Network | 60 |
| Network(*)\Total Bytes | Network | 60 |
| Network(*)\Total Packets Transmitted | Network | 60 |
| Network(*)\Total Packets Received | Network | 60 |
| Network(*)\Total Rx Errors | Network | 60 |
| Network(*)\Total Tx Errors | Network | 60 |
| Network(*)\Total Collisions | Network | 60 |
| System(*)\Uptime | System | 60 |
| System(*)\Load1 | System | 60 |
| System(*)\Load5 | System | 60 |
| System(*)\Load15 | System | 60 |
| System(*)\Users | System | 60 |
| System(*)\Unique Users | System | 60 |
| System(*)\CPUs | System | 60 |
- Learn more about Azure Monitor Agent.
- Learn more about data collection rules.