Prometheus: UTF8 metrics for prometheus devenv (#98237)

* utf8 metrics for prometheus devenv

* add label value with quotes

.github/CODEOWNERS

@@ -267,6 +267,7 @@
 /devenv/docker/blocks/prometheus/ @grafana/oss-big-tent
 /devenv/docker/blocks/prometheus_random_data/ @grafana/oss-big-tent
 /devenv/docker/blocks/prometheus_high_card/ @grafana/oss-big-tent
+/devenv/docker/blocks/prometheus_utf8/ @grafana/oss-big-tent
 /devenv/docker/blocks/pyroscope/ @grafana/observability-traces-and-profiling
 /devenv/docker/blocks/redis/ @bergquist
 /devenv/docker/blocks/sensugo/ @grafana/grafana-backend-group

devenv/docker/blocks/prometheus/Dockerfile

@@ -1,4 +1,4 @@
-FROM prom/prometheus:latest
+FROM prom/prometheus:v3.1.0
 ADD prometheus.yml /etc/prometheus/
 ADD recording.yml /etc/prometheus/
 ADD alert.yml /etc/prometheus/

devenv/docker/blocks/prometheus/docker-compose.yaml

@@ -15,7 +15,7 @@
   node_exporter:
     image: prom/node-exporter
     ports:
-      - "9100:9100"
+      - "9101:9100"
 
   fake-prometheus-data:
     image: grafana/fake-data-gen
@@ -42,3 +42,8 @@
     build: docker/blocks/prometheus_high_card
     ports:
       - "9111:9111"
+
+  prometheus-utf8:
+    build: docker/blocks/prometheus_utf8
+    ports:
+      - "9112:9112"

devenv/docker/blocks/prometheus/prometheus.yml

@@ -24,7 +24,7 @@ scrape_configs:
 
   - job_name: 'node_exporter'
     static_configs:
-      - targets: ['node_exporter:9100']
+      - targets: ['node_exporter:9101']
 
   - job_name: 'fake-data-gen'
     static_configs:
@@ -42,6 +42,10 @@ scrape_configs:
     static_configs:
       - targets: ['prometheus-high-card:9111']
 
+  - job_name: 'prometheus-utf8'
+    static_configs:
+      - targets: [ 'prometheus-utf8:9112' ]
+
   - job_name: 'mysql'
     static_configs:
       - targets: ['mysql-exporter:9104']

devenv/docker/blocks/prometheus_utf8/Dockerfile

@@ -0,0 +1,15 @@
+FROM golang:latest AS builder
+
+ADD main.go /
+ADD go.mod /
+ADD go.sum /
+WORKDIR /
+
+RUN go mod download
+RUN CGO_ENABLED=0 GOOS=linux go build -o main .
+
+FROM scratch
+WORKDIR /
+EXPOSE 9112
+COPY --from=builder /main /main
+ENTRYPOINT ["/main"]

devenv/docker/blocks/prometheus_utf8/docker-compose.yaml

@@ -0,0 +1,6 @@
+prometheus_utf8:
+  build: docker/blocks/prometheus_utf8
+  ports:
+    - "3012:3012"
+  extra_hosts:
+    - "host.docker.internal:host-gateway"

devenv/docker/blocks/prometheus_utf8/go.mod

@@ -0,0 +1,20 @@
+module utf8-support
+
+go 1.22.4
+
+require (
+	github.com/prometheus/client_golang v1.20.5
+	golang.org/x/exp v0.0.0-20240823005443-9b4947da3948
+)
+
+require (
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/klauspost/compress v1.17.9 // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
+	github.com/prometheus/client_model v0.6.1 // indirect
+	github.com/prometheus/common v0.60.1 // indirect
+	github.com/prometheus/procfs v0.15.1 // indirect
+	golang.org/x/sys v0.25.0 // indirect
+	google.golang.org/protobuf v1.34.2 // indirect
+)

devenv/docker/blocks/prometheus_utf8/go.sum

@@ -0,0 +1,34 @@
+github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
+github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
+github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
+github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
+github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+github.com/klauspost/compress v1.17.9 h1:6KIumPrER1LHsvBVuDa0r5xaG0Es51mhhB9BQB2qeMA=
+github.com/klauspost/compress v1.17.9/go.mod h1:Di0epgTjJY877eYKx5yC51cX2A2Vl2ibi7bDH9ttBbw=
+github.com/kylelemons/godebug v1.1.0 h1:RPNrshWIDI6G2gRW9EHilWtl7Z6Sb1BR0xunSBf0SNc=
+github.com/kylelemons/godebug v1.1.0/go.mod h1:9/0rRGxNHcop5bhtWyNeEfOS8JIWk580+fNqagV/RAw=
+github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 h1:C3w9PqII01/Oq1c1nUAm88MOHcQC9l5mIlSMApZMrHA=
+github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822/go.mod h1:+n7T8mK8HuQTcFwEeznm/DIxMOiR9yIdICNftLE1DvQ=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/prometheus/client_golang v1.20.5 h1:cxppBPuYhUnsO6yo/aoRol4L7q7UFfdm+bR9r+8l63Y=
+github.com/prometheus/client_golang v1.20.5/go.mod h1:PIEt8X02hGcP8JWbeHyeZ53Y/jReSnHgO035n//V5WE=
+github.com/prometheus/client_model v0.6.1 h1:ZKSh/rekM+n3CeS952MLRAdFwIKqeY8b62p8ais2e9E=
+github.com/prometheus/client_model v0.6.1/go.mod h1:OrxVMOVHjw3lKMa8+x6HeMGkHMQyHDk9E3jmP2AmGiY=
+github.com/prometheus/common v0.60.1 h1:FUas6GcOw66yB/73KC+BOZoFJmbo/1pojoILArPAaSc=
+github.com/prometheus/common v0.60.1/go.mod h1:h0LYf1R1deLSKtD4Vdg8gy4RuOvENW2J/h19V5NADQw=
+github.com/prometheus/procfs v0.15.1 h1:YagwOFzUgYfKKHX6Dr+sHT7km/hxC76UB0learggepc=
+github.com/prometheus/procfs v0.15.1/go.mod h1:fB45yRUv8NstnjriLhBQLuOUt+WW4BsoGhij/e3PBqk=
+github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
+github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
+golang.org/x/exp v0.0.0-20240823005443-9b4947da3948 h1:kx6Ds3MlpiUHKj7syVnbp57++8WpuKPcR5yjLBjvLEA=
+golang.org/x/exp v0.0.0-20240823005443-9b4947da3948/go.mod h1:akd2r19cwCdwSwWeIdzYQGa/EZZyqcOdwWiwj5L5eKQ=
+golang.org/x/sys v0.25.0 h1:r+8e+loiHxRqhXVl6ML1nO3l1+oFoWbnlu2Ehimmi34=
+golang.org/x/sys v0.25.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+google.golang.org/protobuf v1.34.2 h1:6xV6lTsCfpGD21XK49h7MhtcApnLqkfYgPcdHftf6hg=
+google.golang.org/protobuf v1.34.2/go.mod h1:qYOHts0dSfpeUzUFpOMr/WGzszTmLH+DiWniOlNbLDw=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

devenv/docker/blocks/prometheus_utf8/main.go

@@ -0,0 +1,112 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"net/http"
+	"strconv"
+	"time"
+
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+	"github.com/prometheus/common/model"
+	"golang.org/x/exp/rand"
+)
+
+func randomValues(max int) func() (string, bool) {
+	i := 0
+	return func() (string, bool) {
+		i++
+		return strconv.Itoa(i), i < max+1
+	}
+}
+
+func staticList(input []string) func() string {
+	return func() string {
+		i := rand.Intn(len(input))
+
+		return input[i]
+	}
+}
+
+type dimension struct {
+	label        string
+	getNextValue func() string
+}
+
+func init() {
+	// This can be removed when the default validation scheme in common is updated.
+	model.NameValidationScheme = model.UTF8Validation
+	model.NameEscapingScheme = model.ValueEncodingEscaping
+}
+
+func main() {
+
+	fakeUtf8Metrics := []dimension{
+		{
+			label:        "a_legacy_label",
+			getNextValue: staticList([]string{"legacy"}),
+		},
+		{
+			label:        "label with space",
+			getNextValue: staticList([]string{"space"}),
+		},
+		{
+			label:        "label with 📈",
+			getNextValue: staticList([]string{"metrics"}),
+		},
+		{
+			label:        "label.with.spaß",
+			getNextValue: staticList([]string{"this_is_fun"}),
+		},
+		{
+			label:        "site",
+			getNextValue: staticList([]string{"LA-EPI"}),
+		},
+		{
+			label:        "room",
+			getNextValue: staticList([]string{`"Friends Don't Lie"`}),
+		},
+	}
+
+	dimensions := []string{}
+	for _, dim := range fakeUtf8Metrics {
+		dimensions = append(dimensions, dim.label)
+	}
+
+	utf8Metric := promauto.NewCounterVec(prometheus.CounterOpts{
+		Name: "a.utf8.metric 🤘",
+		Help: "a utf8 metric with utf8 labels",
+	}, dimensions)
+
+	opsProcessed := promauto.NewCounterVec(prometheus.CounterOpts{
+		Name: "a_utf8_http_requests_total",
+		Help: "a metric with utf8 labels",
+	}, dimensions)
+
+	http.Handle("/metrics", promhttp.Handler())
+	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusOK)
+		w.Write([]byte("Hello, is it me you're looking for?"))
+	})
+
+	go func() {
+		for {
+			labels := []string{}
+			for _, dim := range fakeUtf8Metrics {
+				value := dim.getNextValue()
+				labels = append(labels, value)
+			}
+
+			utf8Metric.WithLabelValues(labels...).Inc()
+			opsProcessed.WithLabelValues(labels...).Inc()
+
+			time.Sleep(time.Second * 5)
+		}
+	}()
+
+	fmt.Printf("Server started at :9112\n")
+
+	log.Fatal(http.ListenAndServe(":9112", nil))
+}