*Thank you Julius Volz!!*
Op vrijdag 24 april 2020 11:18:28 UTC+2 schreef J Houer:
>
> We use a Prometheus alert (and node-exporter) to check whether we are
> running out of memory on a node.
>
>
> Issue: In many cases I get an alert with a $value that is below the
> threshold value in the expression.The expression is:
>
>
> alert: GettingOutOfMemory
>> expr: max(sum
>> by(instance) ((((node_memory_MemTotal_bytes) - (node_memory_MemFree_bytes
>> + node_memory_Buffers_bytes
>> + node_memory_Cached_bytes)) / (node_memory_MemTotal_bytes)) * 100)) >= 90
>> for: 5m
>> labels:
>> severity: warning
>> annotations:
>> description: Docker Swarm node {{ $labels.instance }} memory usage is at
>> {{ humanize $value}}%.
>> summary: Memory is getting low for Swarm node '{{ $labels.node_name }}'
>>
>>
> I get messages saying that we ran out of memory at e.g. 63%. So that is
> the value of the $value. This is clearly below the 90% threshold.
>
> Why do I get this alert even though the $value is below the threshold?
>
>
> How can I repair this Prometheus alert rule so I will only get only alerts
> when the $value is above the threshold?
>
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