hello-world for exemplar in go_client

[Hao Ke]

Hi there, 

I want to use the exemplar feature to expose exemplar to metrics.

I found the a promising example code here:

https://github.com/prometheus/client_golang/blob/master/examples/random/main.go#L99

But when I download and run the whole example, I still can't see exemplar.

all I got was like 

...

rpc_durations_histogram_seconds_bucket{le="1.0000000000000216e-05"} 11

rpc_durations_histogram_seconds_bucket{le="0.00011000000000000022"} 14

rpc_durations_histogram_seconds_bucket{le="0.00021000000000000023"} 16

rpc_durations_histogram_seconds_bucket{le="0.0003100000000000002"} 17

rpc_durations_histogram_seconds_bucket{le="0.0004100000000000002"} 19

rpc_durations_histogram_seconds_bucket{le="0.0005100000000000003"} 19

...

But I was expecting something like 

rpc_durations_histogram_seconds_bucket{le="0.0005100000000000003"} 19 # {"dummyID": "xxxxx"}

Did I missed anything? 

[Julien Pivotto]

Examplars are available when using the OpenMetrics exposition format.

promhttp.HandlerOpts{
// Opt into OpenMetrics to support exemplars.
EnableOpenMetrics: true,
},


Additionally, you need to use the correct Accept header, e.g.

curl -H 'Accept: application/openmetrics-text; version=0.0.1' http://myapp/metrics


Regards,

> rpc_durations_histogram_seconds_bucket{le="0.0005100000000000003"} 19 *# {"dummyID":
> "xxxxx"}*
>
> Did I missed anything?
>
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--
Julien Pivotto
@roidelapluie

[Hao Ke]

Thanks, Julien

It works! It looks like the Accept Header was the part I was missing. 

Thank you