Initial version

plugins/other/postgresql_active_backends

@@ -0,0 +1,49 @@
+#!/bin/bash
+#
+# Plugin to monitor PostgreSQL Backends
+#
+# Author:
+#    Guilherme Augusto da Rocha Silva <gars.dba@gmail.com>
+#
+# Created:
+#    5th of november 2007
+#
+# Usage:
+#    Place in /etc/munin/plugins/ (or link it there using ln -s)
+#
+# Parameters:
+#    config   (required)
+#
+# General info:
+#    Require permission for database access and read (no writes are processed).
+#    Recomended user is PostgreSQL database owner (default: postgres).
+#
+# Log info:
+# 2007/11/30 - Review on comments
+#
+
+dbserver='localhost'
+dbuser='postgres'
+
+if [ "$1" = "config" ]; then
+   maximum=$(psql -h ${dbserver} -U ${dbuser} -tc "SHOW max_connections;" | bc)
+   reserved=$(psql -h ${dbserver} -U ${dbuser} -tc "SHOW superuser_reserved_connections;" | bc)
+   warning=$(((maximum-reserved)*70/100))
+   critical=$(((maximum-reserved)*90/100))
+   echo 'graph_args --base 1000 --lower-limit 0 --upper-limit '${maximum}
+   echo 'graph_category Postgresql'
+   echo 'graph_info Shows open backends on the PostgreSQL Server.'
+   echo 'graph_scale no'
+   echo 'graph_title PostgreSQL Active Backends'
+   echo 'graph_vlabel Number of active backends'
+   echo 'backends.label backends'
+   echo 'backends.type GAUGE'
+   echo 'backends.min 0'
+   echo 'backends.max '${maximum}
+   echo 'backends.warning '${warning}
+   echo 'backends.critical '${critical}
+   echo 'backends.info Number of open sessions.'
+   exit 0
+fi
+
+echo 'backends.value '$(psql -h ${dbserver} -U ${dbuser} -tc "SELECT SUM(numbackends) FROM pg_stat_database;" | bc)