Add pgCluu for Postgres monitoring

source/resources/apps/pgcluu/README.md

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+# pgCluu for PostgreSQL
+
+##############################################################################
+# Install on PostgreSQL Servers
+
+# Configure postgres:
+#vim /etc/postgresql/10/main/postgresql.conf
+
+# Change:
+
+# Set up sysstat:
+dpkg-reconfigure sysstat
+
+##############################################################################
+# Install on Web Node
+
+# On server pgcluu node, add a user:
+adduser pgcluu
+sudo su - pgcluu
+# copy that key to user pgcluu@pg1 pg2 pg3 pg4 (create users there too)
+ssh-keygen -t ed25519
+
+# Set up Debian Stretch node
+# Install postgres repos:
+echo 'deb http://apt.postgresql.org/pub/repos/apt/ stretch-pgdg main' > /etc/apt/sources.list.d/pgdg.list
+wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | sudo apt-key add -
+apt update
+apt install postgresql-client-10
+
+apt install sysstat
+
+# Install pgcluu from repos: XXX don't do this way
+# apt install pgcluu
+# Meh, the packaged version is ancient, use latest release
+# apt remove pgcluu
+
+# Manual install instead:
+sudo apt install make
+wget -O pgcluu-2.7.tar.gz https://github.com/darold/pgcluu/archive/v2.7.tar.gz
+tar zxf pgcluu-2.7.tar.gz
+cd pgcluu-2.7/
+perl Makefile.PL
+make
+sudo make install
+sudo mkdir -p /var/lib/pgcluu/data/pg1 /var/lib/pgcluu/data/pg2 /var/lib/pgcluu/data/pg3 /var/lib/pgcluu/data/pg4
+sudo chown -R pgcluu:pgcluu /var/lib/pgcluu
+sudo mkdir /var/run/pgcluu
+sudo chown pgcluu:pgcluu /var/run/pgcluu
+
+
+# Set up apache2
+apt install apache2
+rm /var/www/html/index.html
+mkdir /var/www/html/pg1 /var/www/html/pg2 /var/www/html/pg3 /var/www/html/pg4
+chown -R pgcluu:pgcluu /var/www/html
+
+# Set up script for user pgcluu to run:
+# See scripts: forksand-pgcluu forksand-pgcluu_collectd
+# XXX forksand-pgcluu_collectd needs to start on boot XXX
+
+# Run that script in cron as user pgcluu:
+crontab -e
+# m h  dom mon dow   command
+*/5 *  *   *   *     /home/pgcluu/forksand-pgcluu
+
+
+##############################################################################
+# Admin Web Client
+
+# On workstation create tunnel:
+ssh -N -C -L 54680:localhost:80 pgcluu
+
+# On workstation, in browser:
+http://localhost:54680/
+##############################################################################