collector/receiver/prometheusreceiver/factory.go

// Copyright The OpenTelemetry Authors
//
// Licensed 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 prometheusreceiver // import "github.com/GoogleCloudPlatform/run-gmp-sidecar/collector/receiver/prometheusreceiver"

import (
	"context"
	"errors"

	promconfig "github.com/prometheus/prometheus/config"
	_ "github.com/prometheus/prometheus/discovery/install" // init() of this package registers service discovery impl.
	"go.opentelemetry.io/collector/component"
	"go.opentelemetry.io/collector/consumer"
	"go.opentelemetry.io/collector/featuregate"
	"go.opentelemetry.io/collector/receiver"

	"github.com/GoogleCloudPlatform/run-gmp-sidecar/collector/receiver/prometheusreceiver/internal/metadata"
)

var useCreatedMetricGate = featuregate.GlobalRegistry().MustRegister(
	"receiver.prometheusreceiver.UseCreatedMetric",
	featuregate.StageAlpha,
	featuregate.WithRegisterDescription("When enabled, the Prometheus receiver will"+
		" retrieve the start time for Summary, Histogram and Sum metrics from _created metric"),
)

var errRenamingDisallowed = errors.New("metric renaming using metric_relabel_configs is disallowed")

// NewFactory creates a new Prometheus receiver factory.
func NewFactory() receiver.Factory {
	return receiver.NewFactory(
		metadata.Type,
		createDefaultConfig,
		receiver.WithMetrics(createMetricsReceiver, metadata.MetricsStability))
}

func createDefaultConfig() component.Config {
	return &Config{
		PrometheusConfig: &promconfig.Config{
			GlobalConfig: promconfig.DefaultGlobalConfig,
		},
	}
}

func createMetricsReceiver(
	_ context.Context,
	set receiver.Settings,
	cfg component.Config,
	nextConsumer consumer.Metrics,
) (receiver.Metrics, error) {
	return newPrometheusReceiver(set, cfg.(*Config), nextConsumer), nil
}