make vcenter optional

If vcenter hostname isnt set dont try to get vra cpu and memory

app/python-node-exporter.py

@@ -30,7 +30,6 @@ vcenter_host = os.environ.get('VCENTER_HOST', 'vcenter.local')
 vcenter_user = os.environ.get('VCENTER_USER', 'administrator@vsphere.local')
 vcenter_pwd = os.environ.get('VCENTER_PASSWORD', 'supersecret')
 
-
 # Get the hostname of the machine
 container_id = str(socket.gethostname())
 
@@ -53,6 +52,13 @@ siteId = "NotSet"
 siteName = "NotSet"
 lastStats = CaseInsensitiveDict()
 
+# Check if vCenter is set, if not disable VRA metrics
+is_vcenter_set = True
+if vcenter_host == "vcenter.local":
+    log.error("vCenter Host not set. Please set the environment variable VCENTER_HOST, turning off VRA CPU and Memory metrics")
+    is_vcenter_set = False
+log.debug("vCenter data collection is enabled")
+
 # Authentication Thread which handles authentication and token refresh for ZVM API
 def ZvmAuthHandler():
     log.debug("ZVMAuthHandler Thread Started")
@@ -483,6 +489,7 @@ def GetVraMetrics():
                 log.debug("Response from GET /v1/vras: %s", response.text)
                 # parse JSON response and get the name of each VRA
                 
+                if is_vcenter_set:
                     # Disable SSL certificate verification
                     context = ssl.SSLContext(ssl.PROTOCOL_SSLv23)
                     context.verify_mode = ssl.CERT_NONE
@@ -508,6 +515,7 @@ def GetVraMetrics():
                     
                     
                     vras = response.json()
+                    
                 log.debug("VRA names: %s", vras)
                 log.debug(type(vras))
                 for vra in vras :
@@ -529,7 +537,7 @@ def GetVraMetrics():
 
 
                     # get the CPU and memory usage for each VRA
-
+                    if is_vcenter_set:
                         vm = None
                         for vm_obj in vm_view.view:
                             if vm_obj.name == vra['VraName']: