monitor vm article

Author: bwren

articles/azure-monitor/insights/media/monitor-vm-azure/metrics.png

@@ -6,7 +6,7 @@ ms.subservice: logs
 ms.topic: conceptual
 author: bwren
 ms.author: bwren
-ms.date: 03/17/2020
+ms.date: 05/05/2020
 
 ---
 
@@ -20,7 +20,7 @@ This article describes how to use Azure Monitor to collect and analyze monitorin
 ## Differences from other Azure resources
 [Monitoring Azure resources with Azure Monitor](monitor-azure-resource.md) describes the monitoring data generated by Azure resources and how you can use the features of Azure Monitor to analyze and alert on this data. You can collect and act on the same monitoring data from Azure virtual machines with the following differences:
 
-- [Platform metrics](../platform/data-platform-metrics.md) are collected automatically for virtual machines but only for the [virtual machine host](#monitoring-data). You need an agent to collect performance data from the guest operating system. 
+-  [Platform metrics](../platform/data-platform-metrics.md) are collected automatically for virtual machines but only for the [virtual machine host](#monitoring-data). You need an agent to collect performance data from the guest operating system. 
 - Virtual machines don't generate [resource logs](../platform/platform-logs-overview.md) which provide insight into operations that were performed within an Azure resource. You use an agent to collect log data from the guest operating system.
 - You can create [diagnostic settings](../platform/diagnostic-settings.md) for a virtual machine to send platform metrics to other destinations such as storage and event hubs, but you can't configure these diagnostic settings in the Azure portal. 
 
@@ -117,7 +117,6 @@ az monitor diagnostic-settings create \
 --resource /subscriptions/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx/resourceGroups/my-resource-group/providers/Microsoft.Compute/virtualMachines/my-vm \
 --metrics '[{"category": "AllMetrics","enabled": true}]' \
 --workspace /subscriptions/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx/resourcegroups/my-resource-group/providers/microsoft.operationalinsights/workspaces/my-workspace
-
 ```
 
 ## Monitoring in the Azure portal 
@@ -145,12 +144,13 @@ Once you configure collection of monitoring data for a virtual machine, you have
 ## Analyzing metric data
 You can analyze metrics for virtual machines using metrics explorer by opening **Metrics** from the virtual machine's menu. See [Getting started with Azure Metrics Explorer](../platform/metrics-getting-started.md) for details on using this tool. 
 
-There are two namespaces used by virtual machines for metrics:
+There are three namespaces used by virtual machines for metrics:
 
-| Namespace | Description |
-|:---|:---|
-| Virtual Machine Host | Host metrics automatically collected for all Azure virtual machines. Detailed list of metrics at [Microsoft.Compute/virtualMachines](../platform/metrics-supported.md#microsoftcomputevirtualmachines). |
-| Virtual Machine Guest | Guest operating system metrics collected from virtual machines with diagnostics extension installed and configured to send to Azure Monitor sink. |
+| Namespace | Description | Requirement |
+|:---|:---|:---|
+| Virtual Machine Host | Host metrics automatically collected for all Azure virtual machines. Detailed list of metrics at [Microsoft.Compute/virtualMachines](../platform/metrics-supported.md#microsoftcomputevirtualmachines). | Collected automatically with no configuration required. |
+| Guest (classic) | Limited set of guest operating system and application performance data. Available in metrics explorer but not other Azure Monitor features such as metric alerts.  | [Diagnostic extension](../platform/diagnostics-extension-overview.md) installed. Data is read from Azure storage.  |
+| Virtual Machine Guest | Guest operating system and application performance data available to all Azure Monitor features using metrics. | For Windows, [diagnostic extension installed](../platform/diagnostics-extension-overview.md) installed with Azure Monitor sink enabled. For Linux, [Telegraf agent installed](../platform/collect-custom-metrics-linux-telegraf.md). |
 
 ![Metrics](media/monitor-vm-azure/metrics.png)