Hi,

If i use the label for storing the message field, do you know what is the 
maximum length of the string that should not be exceeded?
Is there a recommendation on the maximum size?

Thanks
Loïc

Le mercredi 22 juin 2022 à 16:44:37 UTC+2, Loïc a écrit :

> Thanks for your reply Brian :)
>
> Le mercredi 22 juin 2022 à 15:24:19 UTC+2, Brian Candler a écrit :
>
>> > if i want sent the error log into the alarm generated, i should add the 
>> error message as label of my metric.
>>
>> That gives you a high cardinality label, which is not what Prometheus is 
>> designed for.  Every distinct combination of labels defines a new 
>> timeseries.
>>
>> I can see two solutions here:
>>
>> 1. Use a log storage system like Loki or ElasticSearch/OpenSearch, rather 
>> than Prometheus
>>
>> 2. Include the error message as an "exemplar".  When you have multiple 
>> events in the same timeseries and time window, then you'll only get one 
>> exemplar.  But it may be good enough to give you an "example" of the type 
>> of error you're seeing, and it keeps the cardinality of your counters low. 
>> (Exemplars are experimental and need to be turned on with a feature flag, 
>> and I don't know if mtail supports them)
>>
>>

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