(AzureCXP) Adding log size info

Frank Hu · web-flow · commit e3728584a12b · 2019-08-16T14:57:52.000-07:00
The sign-in events should be about 4kb of data storage per sign-in event. per git issue : https://github.com/MicrosoftDocs/azure-docs/issues/33264 And https://stackoverflow.microsoft.com/questions/152833/azurecxp-size-of-sign-in-audit-event-logs
diff --git a/articles/active-directory/reports-monitoring/concept-activity-logs-azure-monitor.md b/articles/active-directory/reports-monitoring/concept-activity-logs-azure-monitor.md
@@ -67,7 +67,7 @@ If you already have an Azure AD license, you need an Azure subscription to set u
 
 ### Storage size for activity logs
 
-Every audit log event uses about 2 KB of data storage. For a tenant with 100,000 users, which would incur about 1.5 million events per day, you would need about 3 GB of data storage per day. Because writes occur in approximately five-minute batches, you can anticipate approximately 9,000 write operations per month. 
+Every audit log event uses about 2 KB of data storage. Sign in event logs are about 4 KB of data storage. For a tenant with 100,000 users, which would incur about 1.5 million events per day, you would need about 3 GB of data storage per day. Because writes occur in approximately five-minute batches, you can anticipate approximately 9,000 write operations per month. 
 
 
 The following table contains a cost estimate of, depending on the size of the tenant, a general-purpose v2 storage account in West US for at least one year of retention. To create a more accurate estimate for the data volume that you anticipate for your application, use the [Azure storage pricing calculator](https://azure.microsoft.com/pricing/details/storage/blobs/).
@@ -203,4 +203,4 @@ This section answers frequently asked questions and discusses known issues with
 
 * [Archive activity logs to a storage account](quickstart-azure-monitor-route-logs-to-storage-account.md)
 * [Route activity logs to an event hub](quickstart-azure-monitor-stream-logs-to-event-hub.md)
-* [Integrate activity logs with Azure Monitor](howto-integrate-activity-logs-with-log-analytics.md)
+* [Integrate activity logs with Azure Monitor](howto-integrate-activity-logs-with-log-analytics.md)
