Look please at the code below
metricsMux := http.NewServeMux()
// here I want only to expose metrics outside, without any tracking
// just gather them and write response
metricsMux.Handle("/metrics", promhttp.Handler()) // <------
metricsSrv := &http.Server{Handler: metricsMux}
appMux := http.NewServeMux()
// here I want to add prometheus middleware with "promhttp_"-prefix tracking
// only tracking, without any output written
appSrv := &http.Server{Handler: appMux}
If simply add promhttp.Handler() handler to metrics server(as in my
example), "promhttp_"-prefix metrics will contains info about requests to
metrics server and it's useless information. I want them to contain metrics
for my application.
Short: I'm trying to follow separation of concerns while tracking and
exposing metrics.
среда, 17 августа 2022 г. в 13:38:17 UTC+3, [email protected]:
> Hi Oleksandr,
>
> I'm a bit confused. The "promhttp_"-prefixed metrics are about the scrape
> requests themselves and they are still tracked fine when tying the
> promhttp.Handler() to another mux and server (because the scrape requests
> are now happening through that server, and the handler is also doing its
> tracking there now). Or are you talking about HTTP metrics for the rest of
> your application's HTTP handlers (not /metrics) that is running on the
> other server?
>
> On Wed, Aug 17, 2022 at 12:00 PM Oleksandr Matsak <[email protected]>
> wrote:
>
>> Hi, Julius!
>> Thanks for quick reply.
>>
>> Yes, you are right, if I will use separate http.ServeMux on separate
>> server I will loose "promhttp_*" metrics for my application(because they
>> will be counted for separate server).
>>
>>
>> I have found the solution, but don't like it.
>>
>>
>> вторник, 16 августа 2022 г. в 21:05:14 UTC+3, [email protected]:
>>
>>> Hi Alex,
>>>
>>> both approaches are generally fine, based on your needs. With "losing
>>> instrumentation metrics", do you mean the "promhttp_*" metrics about the
>>> scrape itself? Those should still be present when just using
>>> "promhttp.Handler()" on a different http.ServeMux and starting a second
>>> server for that ServeMux. Could you share the relevant lines of your code
>>> and/or elaborate?
>>>
>>> Regards,
>>> Julius
>>>
>>> On Mon, Aug 15, 2022 at 11:34 PM Oleksandr Matsak <[email protected]>
>>> wrote:
>>>
>>>> Hi!
>>>>
>>>> I have REST API application and looking for solution for exposing
>>>> metrics endpoint for internal only access.
>>>>
>>>> I can see two options:
>>>>
>>>> 1. use same *http.Server* as application and protect endpoint with
>>>> supported auth flow (basic, token, etc)
>>>> 2. use different *http.Server* on internal port without any
>>>> authentication
>>>>
>>>> First has drawback of hardcoding auth credentials on both
>>>> infrastructure and application sides, I want to avoid it.
>>>>
>>>> While considering second, found that if just put *promhttp.Handler* to
>>>> separate server I will loose instrumentation metrics.
>>>>
>>>> So how do I see it:
>>>>
>>>> - put instrumentation metrics middleware to application server
>>>> - run another server on internal only port with metrics output
>>>> handler
>>>>
>>>> Any advise ?
>>>>
>>>> Thanks,
>>>> Alex
>>>>
>>>> --
>>>> You received this message because you are subscribed to the Google
>>>> Groups "Prometheus Users" group.
>>>> To unsubscribe from this group and stop receiving emails from it, send
>>>> an email to [email protected].
>>>> To view this discussion on the web visit
>>>> https://groups.google.com/d/msgid/prometheus-users/54038168-acda-40f2-97f7-7fc1212e926cn%40googlegroups.com
>>>>
>>>> <https://groups.google.com/d/msgid/prometheus-users/54038168-acda-40f2-97f7-7fc1212e926cn%40googlegroups.com?utm_medium=email&utm_source=footer>
>>>> .
>>>>
>>>
>>>
>>> --
>>> Julius Volz
>>> PromLabs - promlabs.com
>>>
>> --
>> You received this message because you are subscribed to the Google Groups
>> "Prometheus Users" group.
>> To unsubscribe from this group and stop receiving emails from it, send an
>> email to [email protected].
>>
> To view this discussion on the web visit
>> https://groups.google.com/d/msgid/prometheus-users/1766f79b-ab33-401c-8e0d-f2e7e935ff35n%40googlegroups.com
>>
>> <https://groups.google.com/d/msgid/prometheus-users/1766f79b-ab33-401c-8e0d-f2e7e935ff35n%40googlegroups.com?utm_medium=email&utm_source=footer>
>> .
>>
>
>
> --
> Julius Volz
> PromLabs - promlabs.com
>
--
You received this message because you are subscribed to the Google Groups
"Prometheus Users" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To view this discussion on the web visit
https://groups.google.com/d/msgid/prometheus-users/4b0b1843-8928-4a41-94e9-a8d91cdd7336n%40googlegroups.com.
