Collectd script for squid

squid.bash

# Steps for turning on squid monitoring (until I have an rpm)

cat > /etc/collectd.d/squid << EOF
LoadPlugin exec
<Plugin exec>
        Exec deploy "/var/lib/releng/monitoring/squid"
</Plugin>
EOF

mkdir -p /var/lib/releng/monitoring

cat > /var/lib/releng/monitoring/squid << EOF
#!/bin/sh

INTERVAL=${COLLETD_INTERVAL:-10}
HOSTNAME=`</etc/rightscale.d/booted`
while sleep $INTERVAL; do
squidclient -p 80 cache_object://localhost/counters | awk -v interval=${INTERVAL} -v host=${HOSTNAME} -F ' = ' '/client_http..*/ { gsub("\\.", "_", $1); print "PUTVAL", host"/squid/counter-"$1, "interval="interval, "N:"$2 }'
done
EOF

chmod a+x /var/lib/releng/monitoring/squid

/etc/init.d/collectd restart

COLLETD_INTERVAL - should be COLLECTD_INTERVAL?

I did exactly same as you provide and it doesn't work. Respectively I'm getting some incorrect data. Did you also customize types.db?

rrdtool dump counter-client_http_requests.rrd > test.xml

Couple of lines:

                    <!-- 2016-03-22 12:20:30 CET / 1458645630 --> <row><v>1.0000000000e-01</v></row>
                    <!-- 2016-03-22 12:20:40 CET / 1458645640 --> <row><v>1.0000000000e-01</v></row>
                    <!-- 2016-03-22 12:20:50 CET / 1458645650 --> <row><v>9.5454545455e-02</v></row>
                    <!-- 2016-03-22 12:21:00 CET / 1458645660 --> <row><v>9.4545454545e-02</v></row>

Output from CLI is correct:

PUTVAL xx/squid/counter-client_http_requests interval= N:49749

No, it is not correct. Fix the typo mentioned by @shish and it will work.