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docs/node-mixin: alert on desynchronised clock
Signed-off-by: paulfantom <pawel@krupa.net.pl>
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@ -197,6 +197,44 @@
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severity: 'warning',
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severity: 'warning',
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},
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},
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},
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},
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{
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alert: 'NodeClockSkewDetected',
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expr: |||
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(
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node_timex_offset_seconds > 0.05
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and
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deriv(node_timex_offset_seconds[5m]) >= 0
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)
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or
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(
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node_timex_offset_seconds < 0.05
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and
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deriv(node_timex_offset_seconds[5m]) <= 0
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)
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||| % $._config,
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'for': '10m',
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labels: {
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severity: 'warning',
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},
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annotations: {
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summary: 'Clock skew detected.',
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message: 'Clock on {{ $labels.instance }} is out of sync by more than 300s. Ensure NTP is configured correctly on this host.',
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},
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},
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{
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alert: 'NodeClockNotSynchronising',
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expr: |||
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min_over_time(node_timex_sync_status[5m]) == 0
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||| % $._config,
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'for': '10m',
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labels: {
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severity: 'warning',
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},
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annotations: {
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summary: 'Clock not synchronising.',
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message: 'Clock on {{ $labels.instance }} is not synchronising. Ensure NTP is configured on this host.',
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},
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},
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],
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],
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},
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},
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],
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],
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