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feat(rules): add NodeFileDescriptorLimit kernel exhaustion alert 

Add a new alert when fs.file-nr is close to fs.file-max

Signed-off-by: Loic Blot <loic.blot@unix-experience.fr>
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Loïc Blot 2021-04-30 12:01:51 +02:00 committed by Loic Blot
parent 504f9b785c
commit 55ffe57cbc
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32
docs/node-mixin/alerts/alerts.libsonnet
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@ -277,6 +277,38 @@
description: "At least one device in RAID array on {{ $labels.instance }} failed. Array '{{ $labels.device }}' needs attention and possibly a disk swap.",
},
},
{
alert: 'NodeFileDescriptorLimit',
expr: |||
(
node_filefd_allocated{job="node-exporter"} * 100 / node_filefd_maximum{job="node-exporter"} > 70
)
||| % $._config,
'for': '15m',
labels: {
severity: 'warning',
},
annotations: {
summary: 'Kernel is predicted to exhaust file descriptors limit soon.',
description: 'File descriptors limit at {{ $labels.instance }} is currently at {{ printf "%.2f" $value }}%.',
},
},
{
alert: 'NodeFileDescriptorLimit',
expr: |||
(
node_filefd_allocated{job="node-exporter"} * 100 / node_filefd_maximum{job="node-exporter"} > 90
)
||| % $._config,
'for': '15m',
labels: {
severity: 'critical',
},
annotations: {
summary: 'Kernel is predicted to exhaust file descriptors limit soon.',
description: 'File descriptors limit at {{ $labels.instance }} is currently at {{ printf "%.2f" $value }}%.',
},
},
],
},
],