Confirmed. Take the "Basic Example" from here:
https://pkg.go.dev/github.com/prometheus/client_golang/prometheus#hdr-A_Basic_Example
Remove the .Inc() from the "m.hdFailures.With" line
$ curl -fsS localhost:8080/metrics | grep hd_errors
# HELP hd_errors_total Number of hard-disk errors.
# TYPE hd_errors_total counter
hd_errors_total{device="/dev/sda"} 0
On Wednesday, 3 May 2023 at 21:51:53 UTC+1 Brian Candler wrote:
> Is it a CounterVec you're using?
>
> If so, I think that v.With(labels...) should be sufficient to initialise
> it.
>
> On Wednesday, 3 May 2023 at 20:52:57 UTC+1 Johny wrote:
>
>> Yes golang. I am using promauto to auto register my metrics with the
>> default registry at the time of initialization.
>>
>> https://pkg.go.dev/github.com/prometheus/[email protected]/prometheus/promauto
>>
>> <https://pkg.go.dev/github.com/prometheus/[email protected]/prometheus/promauto>
>>
>> Do you recall a way to force export it always with a default initial
>> value of 0?
>>
>> On Wednesday, May 3, 2023 at 3:33:38 PM UTC-4 Brian Candler wrote:
>>
>>> Yes, you should be able to create a counter which publishes its initial
>>> value of zero. I'm fairly sure I've done this with the Golang client some
>>> time in the past. What language and client library are you using?
>>>
>>> You'll have to initialise the counters explicitly. If the first time the
>>> client library knows about the counter is when you increment it, then
>>> clearly it won't be able to export it until then.
>>>
>>> On Wednesday, 3 May 2023 at 20:19:27 UTC+1 Johny wrote:
>>>
>>>> I need to sum two separate counter metrics capturing request failures
>>>> to compute ratio of error requests for an alerting signal. The code
>>>> initializing and setting these counters sits in separate modules
>>>> preventing
>>>> reuse of one counter.
>>>>
>>>> The problem is when one of the counter is never incremented after a
>>>> restart, service never exports the data point, prometheus will never get
>>>> the time series and the summation will return nothing.
>>>>
>>>> Is there a way to "force" publish a counter to 0 always on service
>>>> reboot during counter initialization to avoid this problem?
>>>>
>>>> (fail_count1 + fail_count2) / (total_count1 + total_count2)
>>>>
>>>>
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