Add UNKNOWN state explicitly in switch case and add javadoc

Author: prakhar10

gateway-ha/src/main/java/io/trino/gateway/ha/clustermonitor/TrinoStatus.java

@@ -18,7 +18,7 @@
  * We should use PENDING when Trino clusters are still spinning up
  * HEALTHY is when health checks report clusters as up
  * UNHEALTHY is when health checks report clusters as down
- * UNKNOWN is when the health checks are not able to determine the status
+ * UNKNOWN is the initial default state and also used when the health checks are not able to determine the status
  */
 public enum TrinoStatus
 {

webapp/src/components/cluster.tsx

@@ -76,8 +76,13 @@ export function Cluster() {
           case 'PENDING':
               statusColor = 'yellow';
               break;
+          case 'UNKNOWN':
+              statusColor = 'white';
+              break;
           default:
+              //This should never happen, but just in case defaulting to UNKNOWN state setup as a safety net
               statusColor = 'white';
+              break;
         }
         return <Tag color={statusColor}>{text}</Tag>;
     };