Merge pull request #279259 from JeffreyWolford/patch-22

New data difference page

Author: AnnaMHuff

articles/azure-monitor/agents/azure-monitor-agent-data-field-differences.md

@@ -0,0 +1,33 @@
+---
+title: Data field differences between MMA and AMA 
+
+description: Documents that field lever data changes made in the migration.
+author: JeffreyWolford
+ms.author: jeffwo
+ms.reviewer: guywild
+ms.topic: reference
+ms.date: 06/21/2024
+
+Customer intent: As an azure administrator, I want to understand which Log Analytics Workspace queries I may need to update after AMA migration.
+
+---
+
+# AMA agent data field differences from MMA
+[Azure Monitor Agent (AMA)](./agents-overview.md) replaces the Log Analytics agent, also known as Microsoft Monitor Agent (MMA) and OMS, for Windows and Linux machines, in Azure and non-Azure environments, on-premises and other clouds. The agent introduces a simplified, flexible method of configuring data collection using [Data Collection Rules (DCRs)](../essentials/data-collection-rule-overview.md). The article provides information on the data fields that change when collected by AMA, which is critical information for you to migrate your LAW queries.
+
+Each of the data changes was carefully considered and the rational for each change is provided in the table. If you encounter a data field that isn't in the tables file a support request. Your help keeping the tables current and complete is appreciated.
+
+## Log analytics workspace tables
+### W3CIISLog Table for Internet Information Services (IIS)
+This table collects log data from the Internet Information Service on Window systems.
+
+|LAW Field | Difference | Reason| Additional Information |
+|---|---|---|---|
+| sSiteName | Not be populated | depends on customer data collection configuration | The MMA agent could turn on collection by default, but by principle is restricted from making configuration changes in other services.<p>Enable the `Service Name (s-sitename)` field in W3C logging of IIS. See [Select W3C Fields to Log](/iis/manage/provisioning-and-managing-iis/configure-logging-in-iis#select-w3c-fields-to-log).|
+| Fileuri | No longer populated | not required for MMA parity | MMA doesn't collect this field. This field was only populated for IIS logs collected from Azure Cloud Services through the Azure Diagnostics Extension.|
+
+
+## Next steps
+- [Azure Monitor Agent migration helper workbook](./azure-monitor-agent-migration-helper-workbook.md)
+- [DCR Config Generator](./azure-monitor-agent-migration-data-collection-rule-generator.md)
+

articles/azure-monitor/toc.yml

@@ -752,6 +752,8 @@ items:
           href: agents/azure-monitor-agent-migration-data-collection-rule-generator.md 
         - name: MMA removal tool
           href: agents/azure-monitor-agent-mma-removal-tool.md
+        - name: AMA data field differences from MMA
+          href: agents/azure-monitor-agent-data-field-differences.md
         - name: Migration custom text log tables
           href: agents/azure-monitor-agent-custom-text-log-migration.md
       - name: Performance