Ubuntu 14.04
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Munin : Set Thresholds
The monitoring target items are set as plugins and thresholds are defined in some plugins by default, but if you'd like to add more thresholds to a plugin, configure like follows.
[1] It's possible to see plugins like follows.
# current enabled plugins are located under the directory below

ls /etc/munin/plugins

cpu        forks        irqstats     ntp_kernel_err       open_inodes  uptime
df         fw_packets   load         ntp_kernel_pll_freq  processes    users
df_inode   if_err_eth0  memory       ntp_kernel_pll_off   proc_pri     vmstat
diskstats  if_eth0      munin_stats  ntp_offset           swap
entropy    interrupts   netstat      open_files           threads

# installed plugins are located under the directory below

ls /usr/share/munin/plugins

acpi                      nvidia_
amavis                    open_files
apache_accesses           open_inodes
apache_processes          openvpn
apache_volume             perdition
[2] It's possible to display current values for each plugin.
# display values for cpu plugin

munin-run cpu

user.value 18278
nice.value 1250
system.value 7586
idle.value 4761687
iowait.value 31943
irq.value 0
softirq.value 259
steal.value 0
guest.value 0

# display values for df plugin

munin-run df

_run.value 0.0918908771132431
_dev_mapper_tmp__vg_root.value 7.84949941507675
_sys_fs_cgroup.value 0
_run_lock.value 0
_run_shm.value 0
_run_user.value 0
_dev_vda1.value 30.2330974791166
[3] Set threshold's value in munin.conf like follows.
⇒ [plugin name].[field name].[warning | critical] min-value:max-value
The field name is just the one which is displayed when executing "munin-run" command. The min-value or max-value can be omitted.
vi /etc/munin/munin.conf
# set threshold on target node

    use_node_name yes
# set 80% of warning and 90% of critical for user field in cpu plugin

    cpu.user.warning :80
    cpu.user.critical :90
# set 80% of warning and 90% of critical for root partition field in df plugin

    df._dev_mapper_VolGroup_lv_root.warning :80
    df._dev_mapper_VolGroup_lv_root.critical :90
[4] If you configured notification setting and a value is over from the threshold's value, the email is sent like follows.
From munin@dlp.srv.world  Fri Jun 12 14:35:07 2015
Return-Path: <munin@dlp.srv.world>
X-Original-To: root
Delivered-To: root@dlp.srv.world
Date: Fri, 12 Jun 2015 14:35:07 +0900
To: root@dlp.srv.world
Subject: Munin-notification for srv.world::dlp.srv.world
User-Agent: Heirloom mailx 12.5 7/5/10
Content-Type: text/plain; charset=us-ascii
From: munin@dlp.srv.world (Munin user)
Status: R

srv.world :: dlp.srv.world :: CPU usage
        CRITICALs: user is 100.38 (outside range [:80]).
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