Agentless prerequisites (#4175)

## Summary

Agentless, in order to run, can be deployed:
- ECH deployment with Fleet Server / Integration Server enabled
- Serverless deployment (O11y or Security)

---------

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

Author: lucabelluccini

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

@@ -1,6 +1,5 @@
 Frequently asked questions and troubleshooting steps for {{elastic-sec}}'s agentless CSPM integration.
 
-
 ## When I make a new integration, when will I see the agent appear on the Integration Policies page? [_when_i_make_a_new_integration_when_will_i_see_the_agent_appear_on_the_integration_policies_page]
 
 After you create a new agentless integration, the new integration policy may show a button that says **Add agent** instead of the associated agent for several minutes during agent enrollment. No action is needed other than refreshing the page once enrollment is complete.
@@ -76,4 +75,5 @@ When you create a new agentless CSPM integration, a new agent policy appears wit
 
 ## Can agentless integrations use a specific range of static IP addresses for configuring allow and deny rules for traffic?
 
-No, agentless integrations can not use a specific range of static IP addresses for configuring ingress and egress allow and deny rules.
+No, agentless integrations can not use a specific range of static IP addresses for configuring ingress and egress allow and deny rules.
+

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

@@ -20,6 +20,12 @@ During technical preview, there are no additional costs associated with deployin
 There is a limit of 5 agentless integrations per project. 
 ::::
 
+## Requirements
+
+* Agentless integrations are supported only on {{ech}}, {{sec-serverless}}, and {{obs-serverless}} deployments.
+* On {{ech}}, agentless integrations require a working [{{fleet-server}}](/reference/fleet/fleet-server.md).
+* To set up a new agentless integration, you need the `Actions and connectors: all` [{{kib}} privilege](/deploy-manage/users-roles/cluster-or-deployment-auth/kibana-privileges.md).
+
 ## Generally available (GA) agentless integrations
 
 Elastic fully supports agentless deployment for the Cloud Security Posture Management (CSPM) integration. Using this integration’s agentless deployment option, you can enable Elastic’s CSPM capabilities just by providing the necessary credentials. Agentless CSPM deployments support AWS, Azure, and GCP accounts.