How to get total service fabric nodes

Question

I need to create service availability metrics for a service fabric service. If all nodes are up then need to report OK state, any node is down then Warning state and multiple nodes are down then Error state. I am little confuse on getting the total number of nodes(UP+Down). I have written the below code and it's not giving any metrics as of now.

public async Task LogServiceFabricHealthMetrics(ServiceContext serviceContext, CancellationToken cancellationToken)
        {
            while (!cancellationToken.IsCancellationRequested)
            {
                var fabricClient = new FabricClient();
                var nodeList = (await fabricClient.QueryManager.GetNodeListAsync()).ToList();

                var serviceName = serviceContext.ServiceName.LocalPath.Split('/')[2];
                var nodesRunningApplication = new List<Node>();

                foreach (var node in nodeList)
                {
                    var nodeApplicationList = await fabricClient.QueryManager.GetDeployedApplicationListAsync(node.NodeName);
                    var nodeApplication = nodeApplicationList.FirstOrDefault(p =>
                        p.ApplicationName.LocalPath.Split('/')[2] == serviceName);

                    if (nodeApplication != null)
                    {
                        nodesRunningApplication.Add(node);
                    }
                }

                if (nodesRunningApplication.Count == nodeList.Count)
                {
                   //All nodes are up and report OK state          
                }
                else
                {
                    if (nodesRunningApplication.Count >= nodeList.Count - 2)
                    {
                      //One node is down and report Warning state                    
                    }
                    else
                    {
                      //More than one node is down and report Error state                      
                    }
                }

                await Task.Delay(this.interval * 6 * 60 * 1000);
            }
        }

Answer 1

//string currentNode = ServiceContext.NodeContext.NodeName;
   var SfClient = new FabricClient();
   var SFnodeList = (await SfClient.QueryManager.GetNodeListAsync()).ToList();

   foreach (var node in SFnodeList)
     {
                Console.WriteLine($"Node Name: {node.NodeName}");
                Console.WriteLine($"Node Status: {node.NodeStatus}");
     }

    var SvcName = ServiceContext.ServiceName.LocalPath.Split('/')[1];
    var nodesRunningApp = new List<Node>();
        foreach (var node in SFnodeList)
          {
             var nodeAppList = await SfClient.QueryManager.GetDeployedApplicationListAsync(node.NodeName);
             var nodeApp = nodeAppList.FirstOrDefault(p =>
              p.ApplicationName.LocalPath.Split('/')[1] == SvcName);
              if (nodeApp != null)
               {
                    nodesRunningApp.Add(node);
               }
           }

Nodes

To Fetch all the running apps

 var currentApps = await SfClient.QueryManager.GetApplicationListAsync();

• Once the service information is fetched, you can check the nodes.

 var currentNodes = SfClient.QueryManager.GetNodeListAsync();
 var nodeInformation = await SfClient.QueryManager.GetNodeLoadInformationAsync("nodeName");

For further information refer to this Blog and SO Link.