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# you can disable an alarm notification by setting the 'to' line to: silent
alarm: used_ram_to_ignore
on: system.ram
class: Utilization
type: System
component: Memory
os: linux freebsd
hosts: *
calc: ($zfs.arc_size.arcsz = nan)?(0):($zfs.arc_size.arcsz - $zfs.arc_size.min)
every: 10s
info: amount of memory reported as used, \
but it is actually capable for resizing itself based on the system needs (eg. ZFS ARC)
alarm: ram_in_use
on: system.ram
class: Utilization
type: System
component: Memory
os: linux
hosts: *
calc: ($used - $used_ram_to_ignore) * 100 / ($used + $cached + $free + $buffers)
units: %
every: 10s
warn: $this > (($status >= $WARNING) ? (80) : (90))
crit: $this > (($status == $CRITICAL) ? (90) : (98))
delay: down 15m multiplier 1.5 max 1h
info: system memory utilization
to: sysadmin
alarm: ram_available
on: mem.available
class: Utilization
type: System
component: Memory
os: linux
hosts: *
calc: $avail * 100 / ($system.ram.used + $system.ram.cached + $system.ram.free + $system.ram.buffers)
units: %
every: 10s
warn: $this < (($status >= $WARNING) ? (15) : (10))
crit: $this < (($status == $CRITICAL) ? (10) : ( 5))
delay: down 15m multiplier 1.5 max 1h
info: percentage of estimated amount of RAM available for userspace processes, without causing swapping
to: sysadmin
alarm: oom_kill
on: mem.oom_kill
os: linux
hosts: *
lookup: sum -30m unaligned
units: kills
every: 5m
warn: $this > 0
delay: down 10m
host labels: _is_k8s_node = false
info: number of out of memory kills in the last 30 minutes
to: sysadmin
## FreeBSD
alarm: ram_in_use
on: system.ram
class: Utilization
type: System
component: Memory
os: freebsd
hosts: *
calc: ($active + $wired + $laundry + $buffers - $used_ram_to_ignore) * 100 / ($active + $wired + $laundry + $buffers - $used_ram_to_ignore + $cache + $free + $inactive)
units: %
every: 10s
warn: $this > (($status >= $WARNING) ? (80) : (90))
crit: $this > (($status == $CRITICAL) ? (90) : (98))
delay: down 15m multiplier 1.5 max 1h
info: system memory utilization
to: sysadmin
alarm: ram_available
on: system.ram
class: Utilization
type: System
component: Memory
os: freebsd
hosts: *
calc: ($free + $inactive + $used_ram_to_ignore) * 100 / ($free + $active + $inactive + $wired + $cache + $laundry + $buffers)
units: %
every: 10s
warn: $this < (($status >= $WARNING) ? (15) : (10))
crit: $this < (($status == $CRITICAL) ? (10) : ( 5))
delay: down 15m multiplier 1.5 max 1h
info: percentage of estimated amount of RAM available for userspace processes, without causing swapping
to: sysadmin
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