Fixed the incorrect device statistics issue happening due to REMOVED and DELETED devices.

components/application-mgt/io.entgra.device.mgt.core.application.mgt.core/src/main/java/io/entgra/device/mgt/core/application/mgt/core/util/subscription/mgt/impl/GroupBasedSubscriptionManagementHelperServiceImpl.java

@@ -195,10 +195,18 @@ public class GroupBasedSubscriptionManagementHelperServiceImpl implements Subscr
             }
             List<Device> devices = HelperUtil.getGroupManagementProviderService().
                     getAllDevicesOfGroup(subscriptionInfo.getIdentifier(), false);
-            List<Integer> deviceIdsOwnByGroup = devices.stream().map(Device::getId).collect(Collectors.toList());
+            List<Integer> removedIds = devices.stream()
+                    .filter(device -> {String status = String.valueOf(device.getEnrolmentInfo().getStatus());
+                        return "REMOVED".equalsIgnoreCase(status) || "DELETED".equalsIgnoreCase(status);})
+                    .map(device -> device.getEnrolmentInfo().getId()).collect(Collectors.toList());
+            List<Integer> enrollmentIdsOwnByGroup = devices.stream().map(device -> device.getEnrolmentInfo().getId()).collect(Collectors.toList());
+            enrollmentIdsOwnByGroup.removeAll(removedIds);
+            List<Integer> deviceIdsOwnByGroup = devices.stream()
+                    .filter(device -> enrollmentIdsOwnByGroup.contains(device.getEnrolmentInfo().getId()))
+                    .map(Device::getId).collect(Collectors.toList());
             SubscriptionStatisticDTO subscriptionStatisticDTO = subscriptionDAO.
                     getSubscriptionStatistic(deviceIdsOwnByGroup, isUnsubscribe, tenantId, applicationReleaseDTO.getId());
-            int allDeviceCount = HelperUtil.getGroupManagementProviderService().getDeviceCount(subscriptionInfo.getIdentifier());
+            int allDeviceCount= deviceIdsOwnByGroup.size();
             return SubscriptionManagementHelperUtil.getSubscriptionStatistics(subscriptionStatisticDTO, allDeviceCount);
         } catch (ApplicationManagementDAOException e) {
             String msg = "Error encountered while getting subscription statistics for group: " + subscriptionInfo.getIdentifier();