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Switch to using absolute limit for low memory alert #247

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Merged
merged 3 commits into from
Nov 28, 2022
Merged

Switch to using absolute limit for low memory alert #247

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c287121
Switch to using absolute limit for low memory alert
jovial Nov 24, 2022
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jovial Nov 25, 2022
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jovial Nov 25, 2022
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4 changes: 2 additions & 2 deletions etc/kayobe/kolla/config/prometheus/system.rules
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Original file line number Diff line number Diff line change
Expand Up @@ -16,13 +16,13 @@ groups:
description: "{{ $labels.device }} is {{ $value }}% full."

- alert: LowMemory
expr: ( ( node_memory_MemTotal_bytes - node_memory_MemAvailable_bytes - (node_memory_Hugepagesize_bytes * node_memory_HugePages_Total)) / (node_memory_MemTotal_bytes - (node_memory_Hugepagesize_bytes * node_memory_HugePages_Total))) * 100 >= 80
expr: (node_memory_MemAvailable_bytes / 1024^3) < {{ alertmanager_low_memory_threshold_gib }}
for: 1m
labels:
severity: alert
annotations:
summary: "Prometheus exporter at {{ $labels.instance }} reports low memory"
description: "Memory is {{ $value }}% full."
description: "Available memory is {{ $value }}."

- alert: HostOomKillDetected
expr: increase(node_vmstat_oom_kill[5m]) > 0
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7 changes: 7 additions & 0 deletions etc/kayobe/kolla/globals.yml
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Expand Up @@ -7,6 +7,13 @@ docker_yum_gpgkey: "https://download.docker.com/linux/centos/gpg"
bifrost_tag: xena-20221102T110017
{% endif %}

#############################################################################
# Monitoring and alerting related settings

es_heap_size: 8g
prometheus_cmdline_extras: "--storage.tsdb.retention.time=30d"
# Threshold to trigger a LowMemory alert in Gibibytes (GiB). When the amount
# of free memory is lower than this value an alert will be triggered.
alertmanager_low_memory_threshold_gib: 5

#############################################################################