Add network monitor script as plugin

config/plugin/network_problem.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+# This plugin checks for common network issues. Currently, it only checks
+# if the conntrack table is full. 
+
+conntrack_max=$(cat /proc/sys/net/ipv4/netfilter/ip_conntrack_max)
+conntrack_count=$(cat /proc/sys/net/ipv4/netfilter/ip_conntrack_count)
+if (( conntrack_count >= conntrack_max )); then
+  echo "Conntrack table full"
+  exit 1
+fi
+
+echo "Conntrack table available"
+exit 0
+