Scope save_issuable_health_status flag to group

Scope save_issuable_health_status feature flag to
group on backend and remove it from GraphQL

doc/api/graphql/reference/gitlab_schema.graphql

@@ -2548,7 +2548,7 @@ type EpicIssue implements Noteable {
   epicIssueId: ID!
 
   """
-  Current health status. Available only when feature flag `save_issuable_health_status` is enabled
+  Current health status. Returns null if `save_issuable_health_status` feature flag is disabled.
   """
   healthStatus: HealthStatus
 
@@ -3539,7 +3539,7 @@ type Issue implements Noteable {
   epic: Epic
 
   """
-  Current health status. Available only when feature flag `save_issuable_health_status` is enabled
+  Current health status. Returns null if `save_issuable_health_status` feature flag is disabled.
   """
   healthStatus: HealthStatus
 

doc/api/graphql/reference/gitlab_schema.json

@@ -7397,7 +7397,7 @@
             },
             {
               "name": "healthStatus",
-              "description": "Current health status. Available only when feature flag `save_issuable_health_status` is enabled",
+              "description": "Current health status. Returns null if `save_issuable_health_status` feature flag is disabled.",
               "args": [
 
               ],
@@ -10125,7 +10125,7 @@
             },
             {
               "name": "healthStatus",
-              "description": "Current health status. Available only when feature flag `save_issuable_health_status` is enabled",
+              "description": "Current health status. Returns null if `save_issuable_health_status` feature flag is disabled.",
               "args": [
 
               ],

doc/api/graphql/reference/index.md

@@ -419,7 +419,7 @@ Relationship between an epic and an issue
 | `dueDate` | Time | Due date of the issue |
 | `epic` | Epic | Epic to which this issue belongs |
 | `epicIssueId` | ID! | ID of the epic-issue relation |
-| `healthStatus` | HealthStatus | Current health status. Available only when feature flag `save_issuable_health_status` is enabled |
+| `healthStatus` | HealthStatus | Current health status. Returns null if `save_issuable_health_status` feature flag is disabled. |
 | `id` | ID | Global ID of the epic-issue relation |
 | `iid` | ID! | Internal ID of the issue |
 | `milestone` | Milestone | Milestone of the issue |
@@ -540,7 +540,7 @@ Autogenerated return type of EpicTreeReorder
 | `downvotes` | Int! | Number of downvotes the issue has received |
 | `dueDate` | Time | Due date of the issue |
 | `epic` | Epic | Epic to which this issue belongs |
-| `healthStatus` | HealthStatus | Current health status. Available only when feature flag `save_issuable_health_status` is enabled |
+| `healthStatus` | HealthStatus | Current health status. Returns null if `save_issuable_health_status` feature flag is disabled. |
 | `iid` | ID! | Internal ID of the issue |
 | `milestone` | Milestone | Milestone of the issue |
 | `reference` | String! | Internal reference of the issue. Returned in shortened format by default |

ee/app/graphql/ee/types/issue_type.rb

@@ -24,8 +24,8 @@ module EE
         field :health_status,
           ::Types::HealthStatusEnum,
           null: true,
-          description: 'Current health status',
-          feature_flag: :save_issuable_health_status
+          description: 'Current health status. Returns null if `save_issuable_health_status` feature flag is disabled.',
+          resolve: -> (obj, _, _) { obj.supports_health_status? ? obj.health_status : nil }
       end
     end
   end

ee/app/models/concerns/health_status.rb

@@ -14,7 +14,8 @@ module HealthStatus
 
   override :supports_health_status?
   def supports_health_status?
-    resource_parent.feature_available?(:issuable_health_status) &&
-      ::Feature.enabled?(:save_issuable_health_status, resource_parent)
+    return false unless resource_parent&.feature_available?(:issuable_health_status)
+
+    ::Feature.enabled?(:save_issuable_health_status, resource_parent.try(:group))
   end
 end