receivercreator

README

Receiver Creator

This receiver can instantiate other receivers at runtime based on whether observed endpoints match a configured rule. To use the receiver creator, you must first configure one or more observers that will discover networked endpoints that you may be interested in. The configured rules will be evaluated for each endpoint discovered. If the rule evaluates to true then the receiver for that rule will be started against the matched endpoint.

Configuration

watch_observers

A list of observers previously defined to be run in the extensions section. receiver_creator will watch for endpoints generated by these observers.

receivers

A map of receiver names (e.g. redis/1) to a template for when and how to instantiate that receiver.

receivers.<receiver_type/id>.rule

Rule expression using expvar syntax. Variables available are detailed below in Rule Expressions.

receivers.<receiver_type/id>.config

This is configuration that will be used when creating the receiver at runtime.

This option can use static and dynamic configuration values. Static values are normal YAML values. However, the value can also be dynamically constructed from the discovered endpoint object. Dynamic values are surrounded by backticks (`). If a literal backtick is needed use \` to escape it. Dynamic values can be used with static values in which case they are concatenated. For example:

config:
   secure_url: https://`pod.labels["secure_host"]`

The value of secure_url will be https:// concatenated with the value of the secure_host label.

This can also be used when the discovered endpoint needs to be changed dynamically. For instance, suppose the IP 1.2.3.4 is discovered without a port but the port needs to be set inside endpoint. You could do:

config:
   endpoint: '`endpoint`:8080'

receivers.<receiver_type/id>.resource_attributes

This setting controls what resource attributes are set on metrics emitted from the created receiver. These attributes can be set from values in the endpoint that was matched by the rule. These attributes vary based on the endpoint type. These defaults can be disabled by setting the attribute to be removed to an empty value. Note that the values can be dynamic and processed the same as in config.

Note that the backticks below are not typos--they indicate the value is set dynamically.

type == "pod"

Resource Attribute	Default
k8s.pod.name	`name`
k8s.pod.uid	`uid`
k8s.namespace.name	`namespace`

type == "port"

Resource Attribute	Default
k8s.pod.name	`pod.name`
k8s.pod.uid	`pod.uid`
k8s.namespace.name	`pod.namespace`

type == "hostport"

None

See redis/2 in examples.

Rule Expressions

Each rule must start with type == ("pod"|"port"|"hostport") && such that the rule matches only one endpoint type. Depending on the type of endpoint the rule is targeting it will have different variables available.

Pod

Variable	Description
type	"pod"
name	name of the pod
namespace	namespace of the pod
uid	unique id of the pod
labels	map of labels set on the pod
annotations	map of annotations set on the pod

Port

Variable	Description
type	"port"
name	container port name
port	port number
protocol	The transport protocol ("TCP" or "UDP")
pod.name	name of the owning pod
pod.namespace	namespace of the pod
pod.uid	unique id of the pod
pod.labels	map of labels of the owning pod
pod.annotations	map of annotations of the owning pod

Host Port

Variable	Description
type	"hostport"
process_name	Name of the process
command	Command line with the used to invoke the process
is_ipv6	true if endpoint is IPv6, otherwise false
port	Port number
transport	The transport protocol ("TCP" or "UDP")

Examples

extensions:
  # Configures the Kubernetes observer to watch for pod start and stop events.
  k8s_observer:
  host_observer:

receivers:
  receiver_creator/1:
    # Name of the extensions to watch for endpoints to start and stop.
    watch_observers: [k8s_observer]
    receivers:
      prometheus_simple:
        # Configure prometheus scraping if standard prometheus annotations are set on the pod.
        rule: type == "pod" && annotations["prometheus.io/scrape"] == "true"
        config:
          metrics_path: '`"prometheus.io/path" in annotations ? annotations["prometheus.io/path"] : "/metrics"`'
          endpoint: '`endpoint`:`"prometheus.io/port" in annotations ? annotations["prometheus.io/port"] : 9090`'

      redis/1:
        # If this rule matches an instance of this receiver will be started.
        rule: type == "port" && port == 6379
        config:
          # Static receiver-specific config.
          password: secret
          # Dynamic configuration value.
          collection_interval: `pod.annotations["collection_interval"]`
      resource_attributes:
          # Dynamic configuration value.
          service.name: `pod.labels["service_name"]`

      redis/2:
        # Set a resource attribute based on endpoint value.
        rule: type == "port" && port == 6379
        resource_attributes:
          # Dynamic value.
          app: `pod.labels["app"]`
          # Static value.
          source: redis
  receiver_creator/2:
    # Name of the extensions to watch for endpoints to start and stop.
    watch_observers: [host_observer]
    receivers:
      redis/on_host:
        # If this rule matches an instance of this receiver will be started.
        rule: type == "port" && port == 6379 && is_ipv6 == true
        resource_attributes:
          service.name: redis_on_host

processors:
  exampleprocessor:

exporters:
  exampleexporter:

service:
  pipelines:
    metrics:
      receivers: [receiver_creator/1, receiver_creator/2]
      processors: [exampleprocessor]
      exporters: [exampleexporter]
  extensions: [k8s_observer, host_observer]

The full list of settings exposed for this receiver are documented here with detailed sample configurations here.

Documentation

Overview

Package receivercreator implements receiver_creator that can instantiate other receivers at runtime.

Index

• func NewFactory() component.ReceiverFactory
• type Config
  • func (cfg *Config) Unmarshal(componentParser *configparser.Parser) error

Functions

func NewFactory

func NewFactory() component.ReceiverFactory

NewFactory creates a factory for receiver creator.

Types

type Config

type Config struct {
	config.ReceiverSettings `mapstructure:",squash"`

	// WatchObservers are the extensions to listen to endpoints from.
	WatchObservers []config.Type `mapstructure:"watch_observers"`
	// ResourceAttributes is a map of default resource attributes to add to each resource
	// object received by this receiver from dynamically created receivers.
	ResourceAttributes resourceAttributes `mapstructure:"resource_attributes"`
	// contains filtered or unexported fields
}

Config defines configuration for receiver_creator.

func (*Config) Unmarshal

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