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Add thresholds for memory, disk and system alerts

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Signed-off-by: Vitaly Zhuravlev <v-zhuravlev@users.noreply.github.com>
This commit is contained in:
Vitaly Zhuravlev 2023-04-06 00:56:00 +08:00
parent 77ae769179
commit 6bdc1d9c98
2 changed files with 21 additions and 12 deletions
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22
docs/node-mixin/alerts/alerts.libsonnet
View file

@ -327,7 +327,7 @@
alert: 'NodeSystemSaturation',
expr: |||
node_load1{%(nodeExporterSelector)s}
/ count without (cpu, mode) (node_cpu_seconds_total{%(nodeExporterSelector)s, mode="idle"}) > 2
/ count without (cpu, mode) (node_cpu_seconds_total{%(nodeExporterSelector)s, mode="idle"}) > %(systemSaturationPerCoreThreshold)d
||| % $._config,
'for': '15m',
labels: {
@ -336,15 +336,15 @@
annotations: {
summary: 'System saturated, load per core is very high.',
description: |||
System load per core at {{ $labels.instance }} has been above 2 for the last 15 minutes, is currently at {{ printf "%.2f" $value }}.
System load per core at {{ $labels.instance }} has been above %(systemSaturationPerCoreThreshold)d for the last 15 minutes, is currently at {{ printf "%.2f" $value }}.
This might indicate this instance resources saturation and can cause it becoming unresponsive.
|||,
||| % $._config,
},
},
{
alert: 'NodeMemoryMajorPagesFaults',
expr: |||
rate(node_vmstat_pgmajfault{%(nodeExporterSelector)s}[5m]) > %(memoryMajorPagesFaultsWarningThreshold)s
rate(node_vmstat_pgmajfault{%(nodeExporterSelector)s}[5m]) > %(memoryMajorPagesFaultsThreshold)d
||| % $._config,
'for': '15m',
labels: {
@ -353,7 +353,7 @@
annotations: {
summary: 'Memory major page faults are occurring at very high rate.',
description: |||
Memory major pages are occurring at very high rate at {{ $labels.instance }}, %(memoryMajorPagesFaultsWarningThreshold)s major page faults per second for the last 15 minutes, is currently at {{ printf "%.2f" $value }}.
Memory major pages are occurring at very high rate at {{ $labels.instance }}, %(memoryMajorPagesFaultsThreshold)d major page faults per second for the last 15 minutes, is currently at {{ printf "%.2f" $value }}.
Please check that there is enough memory available at this instance.
||| % $._config,
},
@ -361,7 +361,7 @@
{
alert: 'NodeMemoryHighUtilization',
expr: |||
100 - (node_memory_MemAvailable_bytes{%(nodeExporterSelector)s} / node_memory_MemTotal_bytes{%(nodeExporterSelector)s} * 100) > %(memoryHighUtilizationThreshold)s
100 - (node_memory_MemAvailable_bytes{%(nodeExporterSelector)s} / node_memory_MemTotal_bytes{%(nodeExporterSelector)s} * 100) > %(memoryHighUtilizationThreshold)d
||| % $._config,
'for': '15m',
labels: {
@ -370,14 +370,14 @@
annotations: {
summary: 'Host is running out of memory.',
description: |||
Memory is filling up at {{ $labels.instance }}, has been above %(memoryHighUtilizationThreshold)s% for the last 15 minutes, is currently at {{ printf "%.2f" $value }}%.
|||,
Memory is filling up at {{ $labels.instance }}, has been above %(memoryHighUtilizationThreshold)d%% for the last 15 minutes, is currently at {{ printf "%.2f" $value }}%.
||| % $._config,
},
},
{
alert: 'NodeDiskIOSaturation',
expr: |||
rate(node_disk_io_time_weighted_seconds_total{%(nodeExporterSelector)s, %(diskDeviceSelector)s}[5m]) > 10
rate(node_disk_io_time_weighted_seconds_total{%(nodeExporterSelector)s, %(diskDeviceSelector)s}[5m]) > %(diskIOSaturationThreshold)d
||| % $._config,
'for': '30m',
labels: {
@ -386,9 +386,9 @@
annotations: {
summary: 'Disk IO queue is high.',
description: |||
Disk IO queue (aqu-sq) is high on {{ $labels.device }} at {{ $labels.instance }}, has been above 10 for the last 15 minutes, is currently at {{ printf "%.2f" $value }}.
Disk IO queue (aqu-sq) is high on {{ $labels.device }} at {{ $labels.instance }}, has been above %(diskIOSaturationThreshold)d for the last 15 minutes, is currently at {{ printf "%.2f" $value }}.
This symptom might indicate disk saturation.
|||,
||| % $._config,
},
},
{

11
docs/node-mixin/config.libsonnet
View file

@ -43,6 +43,11 @@
// just a warning for K8s nodes.
nodeCriticalSeverity: 'critical',
// Load average 1m (per core) on which to trigger the
// 'NodeSystemSaturation' alert.
systemSaturationPerCoreThreshold: 2,
// Available disk space (%) thresholds on which to trigger the
// 'NodeFilesystemSpaceFillingUp' alerts. These alerts fire if the disk
// usage grows in a way that it is predicted to run out in 4h or 1d
@ -66,7 +71,11 @@
// Threshold for the rate of memory major page faults to trigger
// 'NodeMemoryMajorPagesFaults' alert.
memoryMajorPagesFaultsWarningThreshold: 500,
memoryMajorPagesFaultsThreshold: 500,
// Disk IO queue level above which to trigger
// 'NodeDiskIOSaturation' alert.
diskIOSaturationThreshold: 10,
rateInterval: '5m',
// Opt-in for multi-cluster support.