CapacityManagementImpl.updateCapacityForHost(..) use VM update time i…

…n capacity calculation. (#9662)

VM update time is nullable in DB and can cause NullPointerException if record in vm_instance has defined last_host_id and undefined update_time.

server/src/main/java/com/cloud/capacity/CapacityManagerImpl.java

@@ -22,6 +22,7 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.Optional;
 
 import javax.inject.Inject;
 import javax.naming.ConfigurationException;
@@ -709,7 +710,8 @@ public void updateCapacityForHost(final Host host, final Map<Long, ServiceOfferi
         for (VMInstanceVO vm : vmsByLastHostId) {
             Float cpuOvercommitRatio = 1.0f;
             Float ramOvercommitRatio = 1.0f;
-            long secondsSinceLastUpdate = (DateUtil.currentGMTTime().getTime() - vm.getUpdateTime().getTime()) / 1000;
+            long lastModificationTime = Optional.ofNullable(vm.getUpdateTime()).orElse(vm.getCreated()).getTime();
+            long secondsSinceLastUpdate = (DateUtil.currentGMTTime().getTime() - lastModificationTime) / 1000;
             if (secondsSinceLastUpdate < _vmCapacityReleaseInterval) {
                 UserVmDetailVO vmDetailCpu = _userVmDetailsDao.findDetail(vm.getId(), VmDetailConstants.CPU_OVER_COMMIT_RATIO);
                 UserVmDetailVO vmDetailRam = _userVmDetailsDao.findDetail(vm.getId(), VmDetailConstants.MEMORY_OVER_COMMIT_RATIO);