Document the "Show agentless resources” toggle in the Fleet UI settings (#3760)

This PR adds documentation for the "Show agentless resources” toggle in
the Fleet UI settings, which was added in
elastic/kibana#237528. The toggle is available
in 9.1.6 and 9.2.0.

Resolves elastic/ingest-docs#1865

---------

Co-authored-by: Benjamin Ironside Goldstein <[email protected]>

Author: vishaangelova

reference/fleet/fleet-settings.md

@@ -76,7 +76,7 @@ The {{ecloud}} internal output is locked and cannot be edited. This output is us
 
 To add or edit an output:
 
-1. Go to **{{fleet}} > Settings**.
+1. Go to **{{fleet}}** > **Settings**.
 2. Under **Outputs**, select **Add output** or **Edit**.
 
     :::{image} images/fleet-add-output-button.png
@@ -107,7 +107,7 @@ For {{agent}}s that cannot access the internet, you can specify agent binary dow
 
 To add or edit the source of binary downloads:
 
-1. Go to **{{fleet}} > Settings**.
+1. Go to **{{fleet}}** > **Settings**.
 2. Under **Agent Binary Download**, select **Add agent binary source** or **Edit**.
 3. Set the agent binary source name.
 4. For **Host**, specify the address where you are hosting the artifacts repository.
@@ -134,14 +134,33 @@ The following SSL options are available when adding or editing an agent binary s
 
 You can specify a proxy server to be used in {{fleet-server}}, {{agent}} outputs, or for any agent binary download sources. For full details about proxy configuration refer to [Using a proxy server with {{agent}} and {{fleet}}](/reference/fleet/fleet-agent-proxy-support.md).
 
+## Advanced settings [fleet-advanced-settings]
 
-## Delete unenrolled agents [delete-unenrolled-agents-setting]
+On the **{{fleet}}** > **Settings** page, you can also configure {{fleet}} to automatically delete unenrolled agents or to display agentless resources for inspection and diagnostics purposes.
+
+### Delete unenrolled agents [delete-unenrolled-agents-setting]
 
 After an {{agent}} has been unenrolled in {{fleet}}, a number of documents about the agent are retained just in case the agent needs to be recovered at some point. You can choose to have all data related to an unenrolled agent deleted automatically.
 
 Note that this option can also be enabled by adding the `xpack.fleet.enableDeleteUnenrolledAgents: true` setting to the [{{kib}} settings file](/get-started/the-stack.md).
 
 To enable automatic deletion of unenrolled agents:
 
-1. Go to **{{fleet}} > Settings**.
-2. Under **Advanced Settings**, enable the **Delete unenrolled agents** option.
+1. Go to **{{fleet}}** > **Settings**.
+2. In the **Advanced Settings** section, enable the **Delete unenrolled agents** option.
+
+### Show agentless resources [show-agentless-resources-setting]
+
+```{applies_to}
+stack: ga 9.1.6
+serverless: ga
+```
+
+If you have [agentless integrations](/solutions/security/get-started/agentless-integrations.md) deployed, you can enable the **Show agentless resources** option to display agentless agents and policies in {{fleet}} for inspection and diagnostics purposes. This setting is stored locally, and it's only visible to you.
+
+To display agentless resources in the agent and agent policy lists:
+
+1. Go to **{{fleet}}** > **Settings**.
+2. In the **Advanced Settings** section, enable **Show agentless resources**.
+
+Note that you can view and request diagnostics for agentless agents, but you cannot upgrade, unenroll, or reassign them.

solutions/security/get-started/_snippets/agentless-integrations-faq.md

@@ -17,12 +17,12 @@ Agentless agents (which run on Elastic's infrastructure to enable agentless inte
 
 ::::{applies-switch}
 
-:::{applies-item} stack: ga 9.1
-Add the following query to the end of the **Fleet** page's URL: `?showAgentless=true`. 
+:::{applies-item} { stack: ga 9.2, serverless: }
+Go to the **Settings** tab of the **Fleet** page. Navigate to the **Advanced Settings** section, and enable **Show agentless resources**.
 :::
 
-:::{applies-item} stack: ga 9.2
-Go to the **Settings** tab of the **Fleet** page. Navigate to the **Advanced Settings** section, and turn on the **Show agentless resources** toggle.
+:::{applies-item} stack: ga 9.1
+Add the following query to the end of the **Fleet** page's URL: `?showAgentless=true`. 
 :::
 
 ::::