Added API to return user count bands and user count (#25796)

api/v4/source/definitions.yaml

@@ -3569,6 +3569,25 @@ components:
         state:
           description: The current state of the installation
           type: string
+    UserLimits:
+      type: object
+      properties:
+        maxUsersLimit:
+          description: The maximum number of users allowed on server
+          type: integer
+          format: int64
+        lowerBandUserLimit:
+          description: User count after which to show the first upgrade message
+          type: integer
+          format: int64
+        upperBandUserLimit:
+          description: User count after which to show the second upgrade message
+          type: integer
+          format: int64
+        activeUserCount:
+          description: The number of active users in the server
+          type: integer
+          format: int64
 externalDocs:
   description: Find out more about Mattermost
   url: 'https://about.mattermost.com'

api/v4/source/limits.yaml

@@ -0,0 +1,30 @@
+  /api/v4/limits/users:
+    get:
+      tags:
+        - users
+      summary: Gets the user limits for the server
+      description: >
+        Gets the user limits for the server
+        
+        ##### Permissions
+  
+        Requires `sysconsole_read_user_management_users`.
+
+      operationId: getUserLimits
+      responses:
+        "200":
+          description: User limits for server
+          content:
+            application/json:
+              schema:
+                type: array
+                items:
+                  $ref: "#/components/schemas/UserLimits"
+        "400":
+          $ref: "#/components/responses/BadRequest"
+        "401":
+          $ref: "#/components/responses/Unauthorized"
+        "403":
+          $ref: "#/components/responses/Forbidden"
+        "500":
+          $ref: "#/components/responses/InternalServerError"