[DOCS] Add custom fields to cases (#3293)

docs/en/observability/create-observability-connectors.asciidoc

@@ -28,7 +28,7 @@ automatically close when they are sent to an external system.
 +
 --
 [role="screenshot"]
-image::images/add-case-connector.png[]
+image::images/cases-settings.png[View case settings]
 // NOTE: This is an autogenerated screenshot. Do not edit it directly.
 --
 . From the *Incident management system* list, select *Add new connector*.

docs/en/observability/grant-cases-access.asciidoc

@@ -12,7 +12,7 @@ Here are the minimum required privileges:
 |=== 
 
 | Action | {kib} Privileges
-| Give full access to manage cases 
+| Give full access to manage cases and settings
 a|
 * `All` for the *Cases* feature under *{observability}*.
 * `All` for the *{connectors-feature}* feature under *Management*.

docs/en/observability/manage-cases.asciidoc

@@ -22,25 +22,44 @@ default setting is `No connector selected`.
 . After you've completed all of the required fields, click *Create case*.
 
 [float]
-[[add-observability-case-files]]
-=== Add files
+[[case-custom-fields]]
+== Add custom fields
 
-After you create a case, you can upload and manage files on the *Files* tab:
+preview::[]
+
+You can add optional and required fields for customized case collaboration.
 
+. Go to *Cases* -> *Settings*.
++
+--
 [role="screenshot"]
-image::images/case-files.png[A list of files attached to a case]
+image::images/cases-custom-field-settings.png[View custom fields in case settings]
 // NOTE: This is an autogenerated screenshot. Do not edit it directly.
 
-The acceptable file types and sizes are affected by your {kibana-ref}/cases-settings.html[{kib} case settings].
+NOTE: To view and change case settings, you must have the appropriate {kib} feature privileges. Refer to <<grant-cases-access>>.
+--
 
-When you upload a file, a comment is added to the case activity log.
-To view an image, click its name in the activity or file list.
+. In the *Custom fields* section, click *Add field*.
++
+--
+[role="screenshot"]
+image::images/cases-add-custom-field.png[Add a custom field in case settings]
+NOTE: This is an autogenerated screenshot. Do not edit it directly.
+--
 
-[NOTE]
-============================================================================
-Uploaded files are also accessible in *{stack-manage-app} > Files*.
-When you export cases as {kibana-ref}/managing-saved-objects.html[saved objects], the case files are not exported.
-============================================================================
+. Enter a field label.
+
+. Choose a field type: text or toggle.
+
+. If you want the text field to be mandatory in all cases, select *Make this field required*.
+
+. Click *Save field*.
+
+You can subsequently remove or edit custom fields on the *Settings* page.
+
+After you create custom fields, they're added to all new and existing cases.
+
+Existing cases have null values for the new text fields until you set them in each case.
 
 [float]
 [[add-case-notifications]]
@@ -51,8 +70,8 @@ cases.
 
 For hosted {kib} on {ess}:
 
-. Add the email addresses to the monitoring email allowlist. Follow the steps in
-{cloud}/ec-watcher.html#ec-watcher-allowlist[Send alerts by email].
+. Add the email domains to the
+{cloud}/ec-organizations-notifications-domain-allowlist.html[notifications domain allowlist].
 +
 --
 You do not need to take any more steps to configure an email connector or update
@@ -75,6 +94,27 @@ must configure the {kibana-ref}/settings.html#server-publicBaseUrl[server.public
 
 When you subsequently add assignees to cases, they receive an email.
 
+[float]
+[[add-observability-case-files]]
+== Add files
+
+After you create a case, you can upload and manage files on the *Files* tab:
+
+[role="screenshot"]
+image::images/case-files.png[A list of files attached to a case]
+// NOTE: This is an autogenerated screenshot. Do not edit it directly.
+
+The acceptable file types and sizes are affected by your {kibana-ref}/cases-settings.html[{kib} case settings].
+
+When you upload a file, a comment is added to the case activity log.
+To view an image, click its name in the activity or file list.
+
+[NOTE]
+============================================================================
+Uploaded files are also accessible in *{stack-manage-app} > Files*.
+When you export cases as {kibana-ref}/managing-saved-objects.html[saved objects], the case files are not exported.
+============================================================================
+
 [discrete]
 [[manage-case-observability]]
 == Manage existing cases