server: fix NaN values for external resource metrics (apache#11302)

CPU and RAM values for external resource metrics was showing NaN values. This fixes the behaviour.

Signed-off-by: Abhishek Kumar <[email protected]>

Author: shwstppr

server/src/main/java/com/cloud/api/query/dao/HostJoinDaoImpl.java

@@ -207,8 +207,7 @@ private void setNewHostResponseBase(HostJoinVO host, EnumSet<HostDetails> detail
                 hostResponse.setMemWithOverprovisioning(decimalFormat.format(memWithOverprovisioning));
                 hostResponse.setMemoryAllocated(mem);
                 hostResponse.setMemoryAllocatedBytes(mem);
-                String memoryAllocatedPercentage = decimalFormat.format((float) mem / memWithOverprovisioning * 100.0f) +"%";
-                hostResponse.setMemoryAllocatedPercentage(memoryAllocatedPercentage);
+                hostResponse.setMemoryAllocatedPercentage(calculateResourceAllocatedPercentage(mem, memWithOverprovisioning));
 
                 String hostTags = host.getTag();
                 hostResponse.setHostTags(hostTags);
@@ -406,6 +405,9 @@ public List<HostJoinVO> findByClusterId(Long clusterId, Host.Type type) {
     }
 
     private String calculateResourceAllocatedPercentage(float resource, float resourceWithOverProvision) {
+        if (resource == 0 || resourceWithOverProvision == 0) {
+            return "0.00%";
+        }
         DecimalFormat decimalFormat = new DecimalFormat("#.##");
         return decimalFormat.format(((float)resource / resourceWithOverProvision * 100.0f)) + "%";
     }