Tile upgrade to 2.1.0 in PCF foundation results in new warnings in logs.

[richardg0510]

After upgrading the Stackdriver Nozzle for PCF tile to version 2.1.0 in our PCF foundations, we are getting warnings in our logs every 20 - 30 milliseconds. The remote ip in the logs indicate they are originating from the stackdriver-nozzle job vm. After discussion with Pivotal support, they believe it is originating from a call to retrieve app metadata by the nozzle.

Here is a sample log:

35.239.40.104 - "GET https://api.system.sandbox.example.com/v2/apps/00000000-0000-0000-0000-000000000000?inline-relations-depth=2" 404 446 "Go-CF-client/1.1"
{
 httpRequest: {
  remoteIp:  "35.239.40.104"   
  requestMethod:  "GET"   
  requestSize:  "1540"   
  requestUrl:  "https://api.system.sandbox.example.com/v2/apps/00000000-0000-0000-0000-000000000000?inline-relations-depth=2"   
  responseSize:  "446"   
  serverIp:  "10.153.4.25"   
  status:  404   
  userAgent:  "Go-CF-client/1.1"   
 }
 insertId:  "ld53y7ffjcl5b"  
 jsonPayload: {
  @type:  "type.googleapis.com/google.cloud.loadbalancing.type.LoadBalancerLogEntry"   
  statusDetails:  "response_sent_by_backend"   
 }
 logName:  "projects/sandbox/logs/requests"  
 receiveTimestamp:  "2019-03-25T17:09:16.784391478Z"  
 resource: {
  labels: {
   backend_service_name:  ""    
   forwarding_rule_name:  "frontend-https"    
   project_id:  "sandbox"    
   target_proxy_name:  "pcf-router-target-proxy-2"    
   url_map_name:  "pcf-router"    
   zone:  "global"    
  }
  type:  "http_load_balancer"   
 }
 severity:  "WARNING"  
 spanId:  "9d5988d85b812386"  
 timestamp:  "2019-03-25T17:09:15.906622829Z"  
 trace:  "projects/sandbox/traces/98b0110b3875ad666dd58255791f7450"  
}

I have not been able to determine where the app guid that is used in the call is coming from.