The NewCounterFunc doesn't allow using labels on metrics

[ppatierno]

While working on the Strimzi canary project [1] I had this code at the beginning to track a metric related to produced records:

recordsProduced = promauto.NewCounterVec(prometheus.CounterOpts{
			Name:      "records_produced_total",
			Namespace: "strimzi_canary",
			Help:      "The total number of records produced",
		}, []string{"clientid", "partition"})


// at some point in the code
labels := prometheus.Labels{
			"clientid":  ps.canaryConfig.ClientID,
			"partition": strconv.Itoa(i),
		}
		recordsProduced.With(labels).Inc()

Now I have to make this counter to be accessible so I was thinking to use a var and then using NewCounterFunc so something like this:

var recordsProducedCounter uint64 = 0

recordsProduced = promauto.NewCounterFunc(prometheus.CounterOpts{
		Name:      "records_produced_total",
		Namespace: "strimzi_canary",
		Help:      "The total number of records produced",
	}, func() float64 {
		return float64(atomic.LoadUint64(&recordsProducedCounter))
	})

// at some point in the code
atomic.AddUint64(&recordsProducedCounter, 1)

The problem I have now is that I cannot attach updated labels on the metric. The code updates just the variable of course but maybe the func should help about the labels.
Is there any other way to achieve what I need?

[1] https://github.com/strimzi/strimzi-canary

[ppatierno]

I saw some reference here #486 but what about the need for labels?