Example of graph using Munin DSL ...

gistfile1.txt

Graph definition file:

graph "Uptime" do
  title    "Uptime - #{instance.title}"
  vlabel   "Days"
  category "Tomcat"
  args     "--base 1000 --lower-limit 0 --slope-mode"
  scale    "no"

  source "uptime"

  source["uptime"]["draw"] = "AREA"
end

Source definition file:

source "uptime" do
  label "Uptime"
  type  "GAUGE"
  draw  "LINE1"
  min   "0"

  mbean "java.lang:type=Runtime", "Uptime"

  uptime = (data["value"].to_f / 1000) / 86400

  value "%.2f" % uptime
end

Configuration:

graph_args --base 1000 --lower-limit 0 --slope-mode
graph_category Tomcat
graph_scale no
graph_title Uptime - Bushfire Backend 1
graph_vlabel Days
bushfire_backend_1_uptime.draw AREA
bushfire_backend_1_uptime.label Uptime
bushfire_backend_1_uptime.min 0
bushfire_backend_1_uptime.type GAUGE

Result:

bushfire_backend_1_uptime.value 10.13

File:

tomcat_bushfire_backend_1-uptime: symbolic link to `/usr/share/munin/plugins/tomcat_'