Viewing Report File for Notification Ping

You can view which entities have responded to Notification ping and which have not in the XML or JSON report. notificationPingStatusInfo element in the Enterprise Deployment Health Check report contains information about entities as entitiesResponded and entitiesPendingResponse.

As shown in the following sample report file, all the entities have responded to the Notification ping with entityResponseReceived attribute as true. 
"notificationPingStatusInfo" : {
    "entitiesResponded" : [ {
      "entityType" : "Host",
      "entityName" : "Host3",
      "entityId" : 4,
      "entityManagedBy" : null,
      "entityResponseTimeInMillis" : 32,
      "entityResponseReceived" : true
    }, {
      "entityType" : "Host",
      "entityName" : "Host2",
      "entityId" : 3,
      "entityManagedBy" : null,
      "entityResponseTimeInMillis" : 47,
      "entityResponseReceived" : true
    }, {
      "entityType" : "Host",
      "entityName" : "SystemHost",
      "entityId" : 1,
      "entityManagedBy" : null,
      "entityResponseTimeInMillis" : 50,
      "entityResponseReceived" : true
    }, {
      "entityType" : "Host",
      "entityName" : "Host1",
      "entityId" : 2,
      "entityManagedBy" : null,
      "entityResponseTimeInMillis" : 66,
      "entityResponseReceived" : true
    }, {
      "entityType" : "Node",
      "entityName" : "node4",
      "entityId" : 6,
      "entityManagedBy" : "Host4",
      "entityResponseTimeInMillis" : 38,
      "entityResponseReceived" : true
    }, {
      "entityType" : "Node",
      "entityName" : "DevNode",
      "entityId" : 2,
      "entityManagedBy" : "SystemHost",
      "entityResponseTimeInMillis" : 69,
      "entityResponseReceived" : true
    }, {
      "entityType" : "Node",
      "entityName" : "node1",
      "entityId" : 3,
      "entityManagedBy" : "Host1",
      "entityResponseTimeInMillis" : 70,
      "entityResponseReceived" : true
    } ],
    "entitiesPendingResponse" : null
  }
}