[Veeam] Don't interrupt backup syncronization

server/src/main/java/org/apache/cloudstack/backup/BackupManagerImpl.java

@@ -1171,28 +1171,40 @@ protected void runInContext() {
                     }
 
                     final Map<VirtualMachine, Backup.Metric> metrics = backupProvider.getBackupMetrics(dataCenter.getId(), new ArrayList<>(vms));
-                    try {
-                        for (final VirtualMachine vm : metrics.keySet()) {
-                            final Backup.Metric metric = metrics.get(vm);
-                            if (metric != null) {
-                                // Sync out-of-band backups
-                                backupProvider.syncBackups(vm, metric);
-                                // Emit a usage event, update usage metric for the VM by the usage server
-                                UsageEventUtils.publishUsageEvent(EventTypes.EVENT_VM_BACKUP_USAGE_METRIC, vm.getAccountId(),
-                                        vm.getDataCenterId(), vm.getId(), "Backup-" + vm.getHostName() + "-" + vm.getUuid(),
-                                        vm.getBackupOfferingId(), null, metric.getBackupSize(), metric.getDataSize(),
-                                        Backup.class.getSimpleName(), vm.getUuid());
-                            }
-                        }
-                    } catch (final Throwable e) {
-                        LOG.error(String.format("Failed to sync backup usage metrics and out-of-band backups due to: [%s].", e.getMessage()), e);
-                    }
+                    syncBackupMetrics(backupProvider, metrics);
                 }
             } catch (final Throwable t) {
                 LOG.error(String.format("Error trying to run backup-sync background task due to: [%s].", t.getMessage()), t);
             }
         }
 
+        /**
+         * Tries to sync the VM backups. If one backup synchronization fails, only this VM backups are skipped, and the entire process does not stop.
+         */
+        private void syncBackupMetrics(final BackupProvider backupProvider, final Map<VirtualMachine, Backup.Metric> metrics) {
+            for (final VirtualMachine vm : metrics.keySet()) {
+                tryToSyncVMBackups(backupProvider, metrics, vm);
+            }
+        }
+
+        private void tryToSyncVMBackups(BackupProvider backupProvider, Map<VirtualMachine, Backup.Metric> metrics, VirtualMachine vm) {
+            try {
+                final Backup.Metric metric = metrics.get(vm);
+                if (metric != null) {
+                    LOG.debug(String.format("Trying to sync backups of VM [%s] using backup provider [%s].", vm.getUuid(), backupProvider.getName()));
+                    // Sync out-of-band backups
+                    backupProvider.syncBackups(vm, metric);
+                    // Emit a usage event, update usage metric for the VM by the usage server
+                    UsageEventUtils.publishUsageEvent(EventTypes.EVENT_VM_BACKUP_USAGE_METRIC, vm.getAccountId(),
+                            vm.getDataCenterId(), vm.getId(), "Backup-" + vm.getHostName() + "-" + vm.getUuid(),
+                            vm.getBackupOfferingId(), null, metric.getBackupSize(), metric.getDataSize(),
+                            Backup.class.getSimpleName(), vm.getUuid());
+                }
+            } catch (final Exception e) {
+                LOG.error(String.format("Failed to sync backup usage metrics and out-of-band backups of VM [%s] due to: [%s].", vm.getUuid(), e.getMessage()), e);
+            }
+        }
+
         @Override
         public Long getDelay() {
             return BackupSyncPollingInterval.value() * 1000L;