CI: Move grabpl publish-metrics (#55042)

* move grabpl publish-metrics

* grabpl -> ./bin/build

* fix lint error

.drone.yml

@@ -1224,7 +1224,7 @@ steps:
     repo:
     - grafana/grafana
 - commands:
-  - ./scripts/ci-frontend-metrics.sh | ./bin/grabpl publish-metrics $${GRAFANA_MISC_STATS_API_KEY}
+  - ./scripts/ci-frontend-metrics.sh | ./bin/build publish-metrics $${GRAFANA_MISC_STATS_API_KEY}
   depends_on:
   - test-a11y-frontend
   environment:
@@ -5114,6 +5114,6 @@ kind: secret
 name: packages_secret_access_key
 ---
 kind: signature
-hmac: 7b6e3697e7278f2efc8a8c3865df9bd4ad3526e883c27c57f4a08c2f51869793
+hmac: 20e4a947fba1881cbb9b18c8f11b2c896652c701e9c5018e135632034778b4f1
 
 ...

pkg/build/cmd/main.go

@@ -108,6 +108,12 @@ func main() {
 				&noInstallDepsFlag,
 			},
 		},
+		{
+			Name:      "publish-metrics",
+			Usage:     "Publish a set of metrics from stdin",
+			ArgsUsage: "<api-key>",
+			Action:    ArgCountWrapper(1, PublishMetrics),
+		},
 	}
 
 	if err := app.Run(os.Args); err != nil {

pkg/build/cmd/publishmetrics.go

@@ -0,0 +1,41 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"log"
+	"os"
+	"regexp"
+
+	"github.com/grafana/grafana/pkg/build/metrics"
+	"github.com/urfave/cli/v2"
+)
+
+func PublishMetrics(c *cli.Context) error {
+	apiKey := c.Args().Get(0)
+
+	input, err := io.ReadAll(os.Stdin)
+	if err != nil {
+		return cli.NewExitError(fmt.Sprintf("Reading from stdin failed: %s", err), 1)
+	}
+
+	reMetrics := regexp.MustCompile(`(?ms)^Metrics: (\{.+\})`)
+	ms := reMetrics.FindSubmatch(input)
+	if len(ms) == 0 {
+		return cli.NewExitError(fmt.Sprintf("Input on wrong format: %q", string(input)), 1)
+	}
+
+	m := map[string]string{}
+	if err := json.Unmarshal(ms[1], &m); err != nil {
+		return cli.NewExitError(fmt.Sprintf("decoding metrics failed: %s", err), 1)
+	}
+
+	log.Printf("Received metrics %+v", m)
+
+	if err := metrics.Publish(m, apiKey); err != nil {
+		return cli.NewExitError(fmt.Sprintf("publishing metrics failed: %s", err), 1)
+	}
+
+	return nil
+}

pkg/build/metrics/publish.go

@@ -0,0 +1,72 @@
+package metrics
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"log"
+	"strconv"
+	"time"
+
+	"net/http"
+)
+
+type payload struct {
+	Name     string `json:"name"`
+	Value    int    `json:"value"`
+	Interval int    `json:"interval"`
+	MType    string `json:"mtype"`
+	Time     int64  `json:"time"`
+}
+
+// Publish publishes a set of metrics.
+func Publish(metrics map[string]string, apiKey string) error {
+	log.Println("Publishing metrics")
+
+	t := time.Now().Unix()
+	data := []payload{}
+	for k, vS := range metrics {
+		v, err := strconv.Atoi(vS)
+		if err != nil {
+			return fmt.Errorf("key %q has value on invalid format: %q", k, vS)
+		}
+		data = append(data, payload{
+			Name:     k,
+			Value:    v,
+			Interval: 60,
+			MType:    "gauge",
+			Time:     t,
+		})
+	}
+
+	buf := bytes.Buffer{}
+	enc := json.NewEncoder(&buf)
+	if err := enc.Encode(data); err != nil {
+		return err
+	}
+
+	log.Printf("Publishing metrics to https://<user>:<pass>@graphite-us-central1.grafana.net/metrics, JSON: %s",
+		buf.String())
+
+	u := fmt.Sprintf("https://6371:%s@graphite-us-central1.grafana.net/metrics", apiKey)
+
+	//nolint:gosec
+	resp, err := http.Post(u, "application/json", &buf)
+	if err != nil {
+		return fmt.Errorf("metrics publishing failed: %w", err)
+	}
+
+	defer func() {
+		if err := resp.Body.Close(); err != nil {
+			log.Println("Error closing HTTP body", err)
+		}
+	}()
+
+	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
+		return fmt.Errorf("metrics publishing failed with status code %d", resp.StatusCode)
+	}
+
+	log.Printf("Metrics successfully published")
+
+	return nil
+}

scripts/drone/steps/lib.star

@@ -609,7 +609,7 @@ def frontend_metrics_step(edition, trigger=None):
         },
         'failure': 'ignore',
         'commands': [
-            './scripts/ci-frontend-metrics.sh | ./bin/grabpl publish-metrics $${GRAFANA_MISC_STATS_API_KEY}',
+            './scripts/ci-frontend-metrics.sh | ./bin/build publish-metrics $${GRAFANA_MISC_STATS_API_KEY}',
         ],
     }
     if trigger: