README

Prometheus Receiver

Receives metric data in Prometheus format. See the Design for additional information on this receiver.

Supported pipeline types: metrics

⚠️ Warning

Note: This component is currently work in progress. It has several limitations and please don't use it if the following limitations is a concern:

  • Collector cannot auto-scale the scraping yet when multiple replicas of the collector is run.
  • When running multiple replicas of the collector with the same config, it will scrape the targets multiple times.
  • Users need to configure each replica with different scraping configuration if they want to manually shard the scraping.
  • The Prometheus receiver is a stateful component.

Getting Started

This receiver is a drop-in replacement for getting Prometheus to scrape your services. It supports the full set of Prometheus configuration, including service discovery. Just like you would write in a YAML configuration file before starting Prometheus, such as with:

Note: Since the collector configuration supports env variable substitution $ characters in your prometheus configuration are interpreted as environment variables. If you want to use $ characters in your prometheus configuration, you must escape them using $$.

prometheus --config.file=prom.yaml

You can copy and paste that same configuration under:

receivers:
  prometheus:
    config:

For example:

receivers:
    prometheus:
      config:
        scrape_configs:
          - job_name: 'otel-collector'
            scrape_interval: 5s
            static_configs:
              - targets: ['0.0.0.0:8888']
          - job_name: k8s
            kubernetes_sd_configs:
            - role: pod
            relabel_configs:
            - source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_scrape]
              regex: "true"
              action: keep
            metric_relabel_configs:
            - source_labels: [__name__]
              regex: "(request_duration_seconds.*|response_duration_seconds.*)"
              action: keep
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Documentation

Overview

    Package prometheusreceiver has the logic for scraping Prometheus metrics from already instrumented applications and then passing them onto a metricsink instance.

    Index

    Constants

    This section is empty.

    Variables

    This section is empty.

    Functions

    func NewFactory

    func NewFactory() component.ReceiverFactory

      NewFactory creates a new Prometheus receiver factory.

      Types

      type Config

      type Config struct {
      	config.ReceiverSettings `mapstructure:",squash"`
      	PrometheusConfig        *promconfig.Config `mapstructure:"-"`
      	BufferPeriod            time.Duration      `mapstructure:"buffer_period"`
      	BufferCount             int                `mapstructure:"buffer_count"`
      	UseStartTimeMetric      bool               `mapstructure:"use_start_time_metric"`
      	StartTimeMetricRegex    string             `mapstructure:"start_time_metric_regex"`
      
      	// ConfigPlaceholder is just an entry to make the configuration pass a check
      	// that requires that all keys present in the config actually exist on the
      	// structure, ie.: it will error if an unknown key is present.
      	ConfigPlaceholder interface{} `mapstructure:"config"`
      }

        Config defines configuration for Prometheus receiver.

        func (*Config) Unmarshal

        func (cfg *Config) Unmarshal(componentParser *config.Parser) error

          Unmarshal a config.Parser into the config struct.

          func (*Config) Validate

          func (cfg *Config) Validate() error

            Validate checks the receiver configuration is valid

            Directories

            Path Synopsis