fix monitoring-beats-mb template

[klacabane]

Summary

Context elastic/apm-server#7139

Moves the beats_stats.apm-server mapping section under the beats_stats.metrics property as expected by Stack Monitoring.

Testing

• start local elasticsearch with updated mappings
• install apm integration assets
• start apm-server
• ingest some data to the APM Server, run this Go program[1] a few times (Export the ELASTIC_APM_SERVER_URL environment variable)
• verify Stack monitoring's Apm server graphs are populated[2]

[1]

package main

import (
	"context"
	"fmt"
	"os"
	"time"

	"go.elastic.co/apm"
)

func main() {
	version := "undefined"
	if len(os.Args) > 1 {
		version = os.Args[1]
	}
	name := fmt.Sprintf("apm-server-%s", version)
	// apm.DefaultTracer.SetSampler(apm.NewRatioSampler(0.0))

	for i := 0; i < 1000; i++ {
		tx := apm.DefaultTracer.StartTransaction(name, "type")
		ctx := apm.ContextWithTransaction(context.Background(), tx)
		span, ctx := apm.StartSpan(ctx, name, "type")
		span.Duration = time.Second
		span.End()
		tx.Duration = 2 * time.Second
		tx.End()
		<-time.After(time.Millisecond)
	}
	<-time.After(time.Second)
	apm.DefaultTracer.Flush(nil)
	fmt.Printf("%s: %+v\n", name, apm.DefaultTracer.Stats())
}

[2]

[elasticmachine]

Pinging @elastic/es-data-management (Team:Data Management)

[jakelandis]

LGTM.

[klacabane]

💚 All backports created successfully

Status	Branch	Result
✅	8.0

Questions ?

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