Update munin to Redis

tools/munin_monitors/redis_alive

@@ -0,0 +1,16 @@
+#!/bin/sh
+
+case $1 in
+   config)
+        cat <<'EOM'
+graph_title Redis Processes
+graph_vlabel num processes
+graph_category tower
+redis.label Redis Processes
+EOM
+        exit 0;;
+esac
+
+printf "redis.value "
+ps ax | grep redis | grep -v grep | wc -l
+printf "\n"