Filter out loopback metrics (#1444)

* filter out interface loopback

* Filter out loopback metrics

* filter out interface loopback

* Filter out loopback metrics

* filter out interface loopback

* Filter out loopback metrics

* filter out interface loopback

* Filter out loopback metrics

Author: suyadav1

build/linux/installer/conf/telegraf.conf

@@ -509,6 +509,14 @@
   fieldpass = ["bytes_recv", "bytes_sent", "err_in", "err_out"]
   taginclude = ["interface","hostName"]
 
+# net plugin is collecting loopback interface metrics by default from telegraf 1.34.3
+# Filter out loopback metrics to keep it aligned with previous versions
+[[processors.filter]]
+ namepass = ["container.azm.ms/net"]
+
+ [[processors.filter.rule]]
+   tags = {"interface" = ["lo"]}
+
 # Read metrics from the kubernetes kubelet api
 #[[inputs.kubernetes]]
   ## URL for the kubelet