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+# shellcheck shell=bash
+# no need for shebang - this file is loaded from charts.d.plugin
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+# netdata
+# real-time performance and health monitoring, done right!
+# (C) 2016 Costa Tsaousis <costa@tsaousis.gr>
+#
+
+# if this chart is called X.chart.sh, then all functions and global variables
+# must start with X_
+
+# _update_every is a special variable - it holds the number of seconds
+# between the calls of the _update() function
+example_update_every=
+
+# the priority is used to sort the charts on the dashboard
+# 1 = the first chart
+example_priority=150000
+
+# to enable this chart, you have to set this to 12345
+# (just a demonstration for something that needs to be checked)
+example_magic_number=
+
+# global variables to store our collected data
+# remember: they need to start with the module name example_
+example_value1=
+example_value2=
+example_value3=
+example_value4=
+example_last=0
+example_count=0
+
+example_get() {
+ # do all the work to collect / calculate the values
+ # for each dimension
+ #
+ # Remember:
+ # 1. KEEP IT SIMPLE AND SHORT
+ # 2. AVOID FORKS (avoid piping commands)
+ # 3. AVOID CALLING TOO MANY EXTERNAL PROGRAMS
+ # 4. USE LOCAL VARIABLES (global variables may overlap with other modules)
+
+ example_value1=$RANDOM
+ example_value2=$RANDOM
+ example_value3=$RANDOM
+ example_value4=$((8192 + (RANDOM * 16383 / 32767)))
+
+ if [ $example_count -gt 0 ]; then
+ example_count=$((example_count - 1))
+
+ [ $example_last -gt 16383 ] && example_value4=$((example_last + (RANDOM * ((32767 - example_last) / 2) / 32767)))
+ [ $example_last -le 16383 ] && example_value4=$((example_last - (RANDOM * (example_last / 2) / 32767)))
+ else
+ example_count=$((1 + (RANDOM * 5 / 32767)))
+
+ if [ $example_last -gt 16383 ] && [ $example_value4 -gt 16383 ]; then
+ example_value4=$((example_value4 - 16383))
+ fi
+ if [ $example_last -le 16383 ] && [ $example_value4 -lt 16383 ]; then
+ example_value4=$((example_value4 + 16383))
+ fi
+ fi
+ example_last=$example_value4
+
+ # this should return:
+ # - 0 to send the data to netdata
+ # - 1 to report a failure to collect the data
+
+ return 0
+}
+
+# _check is called once, to find out if this chart should be enabled or not
+example_check() {
+ # this should return:
+ # - 0 to enable the chart
+ # - 1 to disable the chart
+
+ # check something
+ [ "${example_magic_number}" != "12345" ] && error "manual configuration required: you have to set example_magic_number=$example_magic_number in example.conf to start example chart." && return 1
+
+ # check that we can collect data
+ example_get || return 1
+
+ return 0
+}
+
+# _create is called once, to create the charts
+example_create() {
+ # create the chart with 3 dimensions
+ cat << EOF
+CHART example.random '' "Random Numbers Stacked Chart" "% of random numbers" random random stacked $((example_priority)) $example_update_every '' '' 'example'
+DIMENSION random1 '' percentage-of-absolute-row 1 1
+DIMENSION random2 '' percentage-of-absolute-row 1 1
+DIMENSION random3 '' percentage-of-absolute-row 1 1
+CHART example.random2 '' "A random number" "random number" random random area $((example_priority + 1)) $example_update_every '' '' 'example'
+DIMENSION random '' absolute 1 1
+EOF
+
+ return 0
+}
+
+# _update is called continuously, to collect the values
+example_update() {
+ # the first argument to this function is the microseconds since last update
+ # pass this parameter to the BEGIN statement (see below).
+
+ example_get || return 1
+
+ # write the result of the work.
+ cat << VALUESEOF
+BEGIN example.random $1
+SET random1 = $example_value1
+SET random2 = $example_value2
+SET random3 = $example_value3
+END
+BEGIN example.random2 $1
+SET random = $example_value4
+END
+VALUESEOF
+
+ return 0
+}