Not collect custom metrics

[bigotto]

After upgrade version to 2.7.0 stopped work custom metrics.
Endpoint /metrics don't cause any error, have only defaults metrics ( http_requests_total, http_request_duration_seconds, http_requests_in_progress_total, http_cache_results)

Using fiber at v2.52.5

PS.: After downgrade to 2.6, works correctly

[pineda89]

I'm having same issue.

The problem are :

fiberprometheus/middleware.go

Line 156 in 7755f92

return create(nil, serviceName, "http", "", nil)

fiberprometheus/middleware.go

Line 167 in 7755f92

return create(nil, serviceName, namespace, subsystem, nil)

fiberprometheus/middleware.go

Line 179 in 7755f92

return create(nil, "", namespace, subsystem, labels)

in these 3 cases, before was

func New(serviceName string) *FiberPrometheus {
	return create(prometheus.DefaultRegisterer, serviceName, "http", "", nil)
}

and now is

func New(serviceName string) *FiberPrometheus {
	return create(nil, serviceName, "http", "", nil)
}

since this change, are not publishing custom metrics properly

[alanhe]

Run into the same problem. I suppose we should switch to fiberprometheus.NewWithRegistry(prometheus.DefaultRegisterer, ... instead?

[gaby]

@alanhe Yes, the reason for the change was that the DefaultRegisterer is shared across modules, so multiple things were updating the same thing. This was exposed when the unit-tests were changed to run in Parallel.

[gaby]

I can add a function called NewWithDefault or something, that uses default registerer.