Added docs for customizing platform components

Author: gaurav-nelson

configuration/customizing-platform-components.adoc

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+:_mod-docs-content-type: ASSEMBLY
+[id="customizing-platform-components_{context}"]
+= Customizing platform components
+include::modules/common-attributes.adoc[]
+:context: customizing-platform-components
+
+toc::[]
+
+[role="_abstract"]
+You can view and customize platform components within {rh-rhacs-first}. {product-title-short} helps you identify vulnerabilities in your user workloads and platform components.
+User workloads are the applications and images that you deploy.
+Platform components include the underlying infrastructure, Operators, and third-party services that support application development.
+Defining these components helps categorize security findings and segments them by area of responsibility.
+
+In previous versions, {product-title-short} automatically identified platform components based on predefined namespaces. Now, you can customize which namespaces {product-title-short} identifies as platform components. Allowing for more granular control over how {product-title-short} categorizes security findings.
+
+include::modules/understanding-platform-components.adoc[leveloffset=+1]
+
+include::modules/modifying-platform-component-definitions.adoc[leveloffset=+1]

modules/modifying-platform-component-definitions.adoc

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+// Module included in the following assemblies:
+//
+// * configuration/customizing-platform-components.adoc
+:_mod-docs-content-type: PROCEDURE
+[id="modifying-platform-component-definitions_{context}"]
+= Modifying platform component definitions
+
+You can define platform components by using namespaces to segment platform security findings from user workloads.
+
+.Prerequisites
+* You must have the `Administration` role with `read` permission to view the platform component configuration options.
+* You must have the `Administration` role with `write` permission to modify the platform component configuration.
+
+.Procedure
+
+. In the RHACS portal, go to **Platform Configuration** > **System Configuration**.
+. On the *System Configuration* view header, click **Edit**.
+. Under the **Platform components configuration** section click on the **Red Hat layered products** tab. Components found in Red Hat layered and partner product namespaces are included in the platform definition by default.
+.. To modify the Red Hat layered products definition, enter one or more namespaces using regular expressions, separated by a pipe `|` symbol. For more information on the syntax structure, see the link:https://github.com/google/re2/wiki/syntax[RE2 syntax reference].
+. Click on the **Custom components** tab.
+.. To add a custom platform component, click **Add custom platform component**. You can add more than one.
+.. In the new Custom component entry, enter a descriptive **Name**.
+.. Enter the **Namespace rules (Regex)** for this custom component. Enter one or more namespaces using regular expressions, separated by a pipe `|` symbol. For more information on the syntax structure, see the link:https://github.com/google/re2/wiki/syntax[RE2 syntax reference].
+. Click **Save**.

modules/understanding-platform-components.adoc

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+// Module included in the following assemblies:
+//
+// * configuration/customizing-platform-components.adoc
+:_mod-docs-content-type: CONCEPT
+[id="understanding-platform-components_{context}"]
+= Understanding platform components
+
+When viewing violations in {product-title-short}, you can view them in the context of user workloads and platform components. This distinction helps you understand the scope of the vulnerabilities.
+
+**User workloads** includes vulnerabilities that affect the workloads and images you deploy in your system. You deploy and manage these workloads.
+
+**Platform** includes vulnerabilities related to the platform itself. For example, these vulnerabilities might be in workloads and images that the {ocp} platform and layered services deploy. {product-title-short} uses regular expression patterns to examine workload namespaces and identify workloads that belong to platform components.
+
+You can view the platform components definition in the {product-title-short} portal by going to **Platform Configuration** > **System Configuration**.
+
+The **Platform components configuration** section lists platform components in the following categories:
+
+* **Core system components**: These components are part of the core {ocp} and Kubernetes namespaces. {product-title-short} includes them in the platform definition by default. You cannot customize these definitions. These definitions might change when you upgrade the system.
+* **Red Hat layered products**: Components found in Red Hat layered and partner product namespaces are included in the platform definition by default.
+* **Custom components**: You can extend the platform definition by defining namespaces for additional applications and products.