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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 #1650

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examples: Follow best practices and established naming conventions
lilic Oct 15, 2024
fd683b8
examples: Switch custom labels example
lilic Oct 29, 2024
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55 changes: 53 additions & 2 deletions examples/customlabels/main.go
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Original file line number Diff line number Diff line change
Expand Up @@ -20,9 +20,11 @@ import (
"flag"
"log"
"net/http"
"time"

"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/collectors"
"github.com/prometheus/client_golang/prometheus/promauto"
"github.com/prometheus/client_golang/prometheus/promhttp"
)

Expand All @@ -33,12 +35,61 @@ 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 •
edited
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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. 😄

reg.MustRegister(
collectors.NewGoCollector(),
collectors.NewProcessCollector(collectors.ProcessCollectorOpts{}),
)

// Expose the registered metrics via HTTP.
// We should see the following metrics with an extra source label. But
// other collectors registered above are expected not to have the extra
// label.
// See also https://prometheus.io/docs/instrumenting/writing_exporters/#target-labels-not-static-scraped-labels
startFireKeeper(prometheus.WrapRegistererWith(prometheus.Labels{"component": "FireKeeper"}, reg))
startSparkForge(prometheus.WrapRegistererWith(prometheus.Labels{"component": "SparkForge"}, reg))

http.Handle("/metrics", promhttp.HandlerFor(reg, promhttp.HandlerOpts{}))
log.Fatal(http.ListenAndServe(*addr, nil))
}

func startFireKeeper(reg prometheus.Registerer) {
firesMaintained := promauto.With(reg).NewCounter(prometheus.CounterOpts{
Name: "fires_maintained_total",
Help: "Total number of fires maintained",
})

sparksDistributed := promauto.With(reg).NewCounter(prometheus.CounterOpts{
Name: "sparks_distributed_total",
Help: "Total number of sparks distributed",
})

go func() {
for {
time.Sleep(5 * time.Second)
firesMaintained.Inc()
log.Println("FireKeeper maintained a fire")
}
}()

go func() {
for {
time.Sleep(7 * time.Second)
sparksDistributed.Inc()
log.Println("FireKeeper distributed a spark")
}
}()
}

func startSparkForge(reg prometheus.Registerer) {
itemsForged := promauto.With(reg).NewCounter(prometheus.CounterOpts{
Name: "items_forged_total",
Help: "Total number of items forged",
})

go func() {
for {
time.Sleep(6 * time.Second)
itemsForged.Inc()
log.Println("SparkForge forged an item")
}
}()
}
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