-Performance metrics enabled as part of Azure Monitor for VMs do not include pre-configured alert rules. However, we may only collect and store a subset of the performance metrics you require in the Log Analytics workspace. If your monitoring strategy requires analysis or alerting that includes other performance metrics in order to effectively evaluate capacity or health of the virtual machine, or you need the flexibility to specify your own alerting criteria or logic, you can configure [collection of those performance counters](../platform/data-sources-performance-counters.md) in Log Analytics and define [log alerts](../platform/alerts-log.md). While Log Analytics allows you to perform complex analysis with other data types, and provide longer retention to support trend analysis, metrics on the other hand, are lightweight and capable of supporting near real-time scenarios. They are collected by the [Azure Diagnostic agent](../../virtual-machines/windows/monitor.md) and stored in the Azure Monitor metrics store, allowing you to create alerts with lower latency and at a lower cost.
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