[Security] Privileged user monitoring - integrations (elastic#3483)

Resolves elastic#3419 by
documenting the support for Okta and Active Directory integrations
within privileged user monitoring. Users can now use these integrations
to define which user roles or groups in their environment are considered
privileged.

Preview: [Set up privileged user
monitoring](https://docs-v3-preview.elastic.dev/elastic/docs-content/pull/3483/solutions/security/advanced-entity-analytics/privileged-user-monitoring-setup)

Author: natasha-moore-elastic

solutions/security/advanced-entity-analytics/privileged-user-monitoring-setup.md

@@ -28,12 +28,25 @@ Privileged users typically include accounts with elevated access rights that all
 
 You can define privileged users in the following ways:
 
+* {applies_to}`stack: preview 9.2` [Add a supported integration](#privmon-integrations) with your organization’s user identities. If your environment is already ingesting data from a supported integration, the setup steps are skipped—you're taken directly to the Privileged user monitoring dashboard, where you can start [monitoring user activity](/solutions/security/advanced-entity-analytics/monitor-privileged-user-activitites.md).
 * [Select an existing index](#privmon-index) or create a new custom index with privileged user data.
 * [Bulk-upload](#privmon-upload) a list of privileged users using a CSV or TXT file. 
 * Use the Entity analytics APIs to [mark individual users as privileged]({{kib-apis}}/operation/operation-createprivmonuser) or [bulk-upload multiple privileged users]({{kib-apis}}/operation/operation-privmonbulkuploaduserscsv).
 
 To get started, find the **Privileged user monitoring** page in the navigation menu or use the [global search field](/explore-analyze/find-and-organize/find-apps-and-objects.md).
 
+### Add a supported integration [privmon-integrations]
+```yaml {applies_to}
+stack: preview 9.2
+```
+
+1. On the **Privileged user monitoring** page, select an integration. The supported integrations are:
+   * [Active Directory Entity Analytics](integration-docs://reference/entityanalytics_ad.md). Users in the following security groups will be automatically assigned as privileged:
+      * Domain Admins
+      * Enterprise Admins
+   * [Okta Entity Analytics](integration-docs://reference/entityanalytics_okta.md). Refer to [Standard administrator roles and permissions](https://help.okta.com/en-us/content/topics/security/administrators-admin-comparison.htm) for a list of Okta roles that will be automatically assigned as privileged users.
+2. Follow the steps to install the integration. 
+
 ### Select or create an index [privmon-index]
 
 1. On the **Privileged user monitoring** page, click **Index**.
@@ -78,6 +91,7 @@ You can use multiple data source types, such as an index and a CSV file, at the
 
 On this page, you can:
 
+* {applies_to}`stack: preview 9.2` Change which integrations you're using as data sources.
 * View, remove, and change indices after initially defining them.
 * Import a new supported file with a list of privileged users.