Add script to find pods with half-closed connections

scripts/lost-sock.sh

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+
+pods=$(kubectl get po -A -l linkerd.io/control-plane-ns -ojsonpath="{range .items[*]}{.metadata.name} {.metadata.namespace}{'\n'}{end}")
+
+IFS=" "
+
+while read name namespace; do
+  tcp=$(kubectl exec -n $namespace $name -c linkerd-proxy -- cat /proc/net/tcp)
+  close_wait=$(echo $tcp | awk 'BEGIN {cnt=0} $4==08 {cnt++} END {print cnt}')
+  fin_wait_2=$(echo $tcp | awk 'BEGIN {cnt=0} $4==05 {cnt++} END {print cnt}')
+  if [ "$close_wait" -gt "0" -o "$fin_wait_2" -gt "0" ]; then
+	echo "$name.$namespace has $close_wait sockets in CLOSE_WAIT and $fin_wait_2 sockets in FIN_WAIT_2"
+  else
+  	echo "$name.$namespace is okay"
+  fi
+done <<< "$pods"