Show drs imbalance as percentage

Author: vishesh92

plugins/metrics/src/main/java/org/apache/cloudstack/metrics/MetricsServiceImpl.java

@@ -789,7 +789,7 @@ public List<ClusterMetricsResponse> listClusterMetrics(Pair<List<ClusterResponse
 
             try {
                 Double imbalance = ClusterDrsAlgorithm.getClusterImbalance(clusterId, cpuList, memoryList, null);
-                metricsResponse.setDrsImbalance(imbalance.isNaN() ? null : String.format("%.2f%%", imbalance));
+                metricsResponse.setDrsImbalance(imbalance.isNaN() ? null : 100.0 * imbalance);
             } catch (ConfigurationException e) {
                 LOGGER.warn("Failed to get cluster imbalance for cluster " + clusterId, e);
             }

plugins/metrics/src/main/java/org/apache/cloudstack/response/ClusterMetricsResponse.java

@@ -213,7 +213,7 @@ public void setMemoryAllocatedDisableThreshold(final Long memAllocated, final Lo
         }
     }
 
-    public void setDrsImbalance(String drsImbalance) {
+    public void setDrsImbalance(Double drsImbalance) {
         if (drsImbalance != null) {
             this.drsImbalance = String.format("%.2f%%", drsImbalance);
         } else {