[Pdns-users] resource-limits metrics

[Remi Gacogne]

Hi Christoph,

On 10/24/21 10:49, Christoph via Pdns-users wrote:
> while going over the list of prometheus metrics available in PowerDNS 
> Recursor I found this one:
> 
> 
>> resource-limits
>>
>> counts number of queries that could not be performed because of 
>> resource limits
> https://docs.powerdns.com/recursor/metrics.html#resource-limits
> 
> I guess if this value is increasing regularly it is a sign of issues. 
> What kind of resource limits are hit when this counter increases?
> Are there other metrics that allow further understanding the possible 
> root causes?

This counter is increased when we encounter a network issue that does 
not seem to be caused by the remote end but by a problem on our side, 
like if the recursor runs out of file descriptors or if we don't have a 
network route to contact a given IP address, for example.
I would suggest checking and likely increasing the number of file 
descriptors available to the recursor as a first step, and then trying 
to correlate the periods where that counter is increasing with a growth 
of others network-related counters.


Best regards,
-- 
Remi Gacogne
PowerDNS.COM BV - https://www.powerdns.com/
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