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Nov 25, 2024
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examples: Follow best practices and established naming conventions #1650

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examples: Follow best practices and established naming conventions
lilic Oct 15, 2024
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examples: Switch custom labels example
lilic Oct 29, 2024
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Merge branch 'main' into examples-best-practices
kakkoyun Nov 19, 2024
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2 changes: 1 addition & 1 deletion examples/customlabels/main.go
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Expand Up @@ -33,7 +33,7 @@ func main() {

// Create a new registry.
reg := prometheus.NewRegistry()
prometheus.WrapRegistererWith(prometheus.Labels{"serviceName": "my-service-name"}, reg).MustRegister(
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Also not sure but it might be worth including the note and link that is mentioned in the WrapRegistererWith description, thoughts?

// WrapRegistererWith provides a way to add fixed labels to a subset of
// Collectors. It should not be used to add fixed labels to all metrics
// exposed. See also
// https://prometheus.io/docs/instrumenting/writing_exporters/#target-labels-not-static-scraped-labels

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@bwplotka bwplotka Oct 15, 2024 •
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Hm good point. One way of doing this is to use a bit more realistic label name and situation. Service name could mean like a gRPC service (ok practice?) or application/service name (anti-pattern, should be a SD role). We clearly wrap GLOBAL process metrics with this label which feels like an anti pattern.

I would be keen on switching to e.g. component (quite often representing code component) e.g. something like

func main() {
	flag.Parse()

	// Create a new registry.
	reg := prometheus.NewRegistry()
	reg.MustRegister(
		collectors.NewGoCollector(),
		collectors.NewProcessCollector(collectors.ProcessCollectorOpts{}),
	)
	
	startComponentA(prometheus.WrapRegistererWith(prometheus.Labels{"component": "A"}, reg))

	// Expose the registered metrics via HTTP.
	// We should see my_counter_objects_total with an extra label.
	// 	# HELP my_counter_objects_total Counter of objects
	//	# TYPE my_counter_objects_total counter
	//	my_counter_objects_total{component="A"} 1
	http.Handle("/metrics", promhttp.HandlerFor(reg, promhttp.HandlerOpts{}))
	log.Fatal(http.ListenAndServe(*addr, nil))
}

func startComponentA(reg prometheus.Registerer) {
	ct := promauto.With(reg).NewCounter(prometheus.CounterOpts{
		Name: "my_counter_objects_total",
		Help: "Counter of objects",
	})

	// ...
	ct.Inc()
}

Would you like to update this example here, or should we do it in other PRs?

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Hm good point. One way of doing this is to use a bit more realistic label name and situation.

I think thats a good suggestion. It illustrates best practice with an example! 👍

Would you like to update this example here, or should we do it in other PRs?

I can update it, will try to get to it this week still.

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@bwplotka I might have gone overboard and adjusted the example to the point where it doesn't make sense or maybe it does? 🫠 Please take a look thanks! Otherwise will adjust to a more simple example. 😄

prometheus.WrapRegistererWith(prometheus.Labels{"service": "my-service-name"}, reg).MustRegister(
collectors.NewGoCollector(),
collectors.NewProcessCollector(collectors.ProcessCollectorOpts{}),
)
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