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intake.go
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intake.go
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// Licensed to Elasticsearch B.V. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
package metricgen
import (
"context"
"fmt"
"os"
"strconv"
"go.elastic.co/apm/module/apmotel/v2"
"go.elastic.co/apm/v2"
"go.opentelemetry.io/otel/sdk/metric"
)
// SendIntakeV2 sends specific metrics to the configured Elastic APM intake V2.
//
// Metrics sent are:
// - apm(float64, value=1.0); gathered from a apm.MetricGatherer
// - apmotel(float64, value=1.0); gathered from a otel MeterProvider through apmotel bridge
// All builtin APM Agent metrics have been disabled.
func SendIntakeV2(_ context.Context, opts ...ConfigOption) (EventStats, error) {
cfg := newConfig(opts...)
if err := cfg.Validate(); err != nil {
return EventStats{}, fmt.Errorf("cannot validate IntakeV2 Metrics configuration: %w", err)
}
// disable builtin metrics entirely to have predictable metrics value.
os.Setenv("ELASTIC_APM_DISABLE_METRICS", "system.*, *cpu*, *golang*")
os.Setenv("ELASTIC_APM_VERIFY_SERVER_CERT", strconv.FormatBool(cfg.verifyServerCert))
stats := EventStats{}
tracer, err := apm.NewTracer(cfg.apmServiceName, "0.0.1")
if err != nil {
return EventStats{}, fmt.Errorf("cannot setup a tracer: %w", err)
}
// setup apmotel bridge to test metrics coming from OTLP
exporter, err := apmotel.NewGatherer()
if err != nil {
return EventStats{}, fmt.Errorf("cannot init gatherer: %w", err)
}
provider := metric.NewMeterProvider(metric.WithReader(exporter))
o := tracer.RegisterMetricsGatherer(exporter)
defer o()
d := tracer.RegisterMetricsGatherer(Gatherer{})
defer d()
meter := provider.Meter("metricgen")
counter, _ := meter.Float64Counter("apmotel")
counter.Add(context.Background(), 1)
stats.Add(1)
tracer.SendMetrics(nil)
stats.Add(1)
tracer.Flush(nil)
return stats, nil
}
type Gatherer struct {
}
// GatherMetrics gathers metrics into out.
func (e Gatherer) GatherMetrics(ctx context.Context, out *apm.Metrics) error {
out.Add("apm", nil, 1.0)
return nil
}