kafkaexporter

README

Kafka Exporter

Status
Stability	beta
Supported pipeline types	traces, logs, metrics
Distributions	contrib

Kafka exporter exports logs, metrics, and traces to Kafka. This exporter uses a synchronous producer that blocks and does not batch messages, therefore it should be used with batch and queued retry processors for higher throughput and resiliency. Message payload encoding is configurable.

The following settings are required:

• protocol_version (no default): Kafka protocol version e.g. 2.0.0

The following settings can be optionally configured:

• brokers (default = localhost:9092): The list of kafka brokers
• topic (default = otlp_spans for traces, otlp_metrics for metrics, otlp_logs for logs): The name of the kafka topic to export to.
• encoding (default = otlp_proto): The encoding of the traces sent to kafka. All available encodings:
  • otlp_proto: payload is Protobuf serialized from ExportTraceServiceRequest if set as a traces exporter or ExportMetricsServiceRequest for metrics or ExportLogsServiceRequest for logs.
  • otlp_json: ** EXPERIMENTAL ** payload is JSON serialized from ExportTraceServiceRequest if set as a traces exporter or ExportMetricsServiceRequest for metrics or ExportLogsServiceRequest for logs.
  • The following encodings are valid only for traces.
    • jaeger_proto: the payload is serialized to a single Jaeger proto Span, and keyed by TraceID.
    • jaeger_json: the payload is serialized to a single Jaeger JSON Span using jsonpb, and keyed by TraceID.\
  • The following encodings are valid only for logs.
    • raw: if the log record body is a byte array, it is sent as is. Otherwise, it is serialized to JSON. Resource and record attributes are discarded.
• auth
  • plain_text
    • username: The username to use.
    • password: The password to use
  • sasl
    • username: The username to use.
    • password: The password to use
    • mechanism: The sasl mechanism to use (SCRAM-SHA-256, SCRAM-SHA-512 or PLAIN)
  • tls
    • ca_file: path to the CA cert. For a client this verifies the server certificate. Should only be used if insecure is set to true.
    • cert_file: path to the TLS cert to use for TLS required connections. Should only be used if insecure is set to true.
    • key_file: path to the TLS key to use for TLS required connections. Should only be used if insecure is set to true.
    • insecure (default = false): Disable verifying the server's certificate chain and host name (InsecureSkipVerify in the tls config)
    • server_name_override: ServerName indicates the name of the server requested by the client in order to support virtual hosting.
  • kerberos
    • service_name: Kerberos service name
    • realm: Kerberos realm
    • use_keytab: Use of keytab instead of password, if this is true, keytab file will be used instead of password
    • username: The Kerberos username used for authenticate with KDC
    • password: The Kerberos password used for authenticate with KDC
    • config_file: Path to Kerberos configuration. i.e /etc/krb5.conf
    • keytab_file: Path to keytab file. i.e /etc/security/kafka.keytab
• metadata
  • full (default = true): Whether to maintain a full set of metadata. When disabled the client does not make the initial request to broker at the startup.
  • retry
    • max (default = 3): The number of retries to get metadata
    • backoff (default = 250ms): How long to wait between metadata retries
• timeout (default = 5s): Is the timeout for every attempt to send data to the backend.
• retry_on_failure
  • enabled (default = true)
  • initial_interval (default = 5s): Time to wait after the first failure before retrying; ignored if enabled is false
  • max_interval (default = 30s): Is the upper bound on backoff; ignored if enabled is false
  • max_elapsed_time (default = 120s): Is the maximum amount of time spent trying to send a batch; ignored if enabled is false
• sending_queue
  • enabled (default = true)
  • num_consumers (default = 10): Number of consumers that dequeue batches; ignored if enabled is false
  • queue_size (default = 5000): Maximum number of batches kept in memory before dropping data; ignored if enabled is false; User should calculate this as num_seconds * requests_per_second where:
    • num_seconds is the number of seconds to buffer in case of a backend outage
    • requests_per_second is the average number of requests per seconds.
• producer
  • max_message_bytes (default = 1000000) the maximum permitted size of a message in bytes
  • required_acks (default = 1) controls when a message is regarded as transmitted. https://pkg.go.dev/github.com/Shopify/sarama@v1.30.0#RequiredAcks
  • compression (default = 'none') the compression used when producing messages to kafka. The options are: none, gzip, snappy, lz4, and zstd https://pkg.go.dev/github.com/Shopify/sarama@v1.30.0#CompressionCodec
  • flush_max_messages (default = 0) The maximum number of messages the producer will send in a single broker request.

Example configuration:

exporters:
  kafka:
    brokers:
      - localhost:9092
    protocol_version: 2.0.0

Documentation

Overview

Package kafkaexporter exports trace data to Kafka.

Index

• func ConfigureAuthentication(config Authentication, saramaConfig *sarama.Config) error
• func NewFactory(options ...FactoryOption) component.ExporterFactory
• type AWSMSKConfig
• type Authentication
• type Config
  • func (cfg *Config) Validate() error
• type FactoryOption
  • func WithTracesMarshalers(tracesMarshalers ...TracesMarshaler) FactoryOption
• type KerberosConfig
• type LogsMarshaler
• type Metadata
• type MetadataRetry
• type MetricsMarshaler
• type PlainTextConfig
• type Producer
• type SASLConfig
• type TracesMarshaler
• type XDGSCRAMClient
  • func (x *XDGSCRAMClient) Begin(userName, password, authzID string) (err error)
  • func (x *XDGSCRAMClient) Done() bool
  • func (x *XDGSCRAMClient) Step(challenge string) (response string, err error)

Functions

func ConfigureAuthentication

func ConfigureAuthentication(config Authentication, saramaConfig *sarama.Config) error

ConfigureAuthentication configures authentication in sarama.Config.

func NewFactory

func NewFactory(options ...FactoryOption) component.ExporterFactory

NewFactory creates Kafka exporter factory.

Types

type AWSMSKConfig

type AWSMSKConfig struct {
	// Region is the AWS region the MSK cluster is based in
	Region string `mapstructure:"region"`
	// BrokerAddr is the client is connecting to in order to perform the auth required
	BrokerAddr string `mapstructure:"broker_addr"`
}

AWSMSKConfig defines the additional SASL authentication measures needed to use AWS_MSK_IAM mechanism

type Authentication

type Authentication struct {
	PlainText *PlainTextConfig            `mapstructure:"plain_text"`
	SASL      *SASLConfig                 `mapstructure:"sasl"`
	TLS       *configtls.TLSClientSetting `mapstructure:"tls"`
	Kerberos  *KerberosConfig             `mapstructure:"kerberos"`
}

Authentication defines authentication.

type Config

type Config struct {
	config.ExporterSettings        `mapstructure:",squash"` // squash ensures fields are correctly decoded in embedded struct
	exporterhelper.TimeoutSettings `mapstructure:",squash"` // squash ensures fields are correctly decoded in embedded struct.
	exporterhelper.QueueSettings   `mapstructure:"sending_queue"`
	exporterhelper.RetrySettings   `mapstructure:"retry_on_failure"`

	// The list of kafka brokers (default localhost:9092)
	Brokers []string `mapstructure:"brokers"`
	// Kafka protocol version
	ProtocolVersion string `mapstructure:"protocol_version"`
	// The name of the kafka topic to export to (default otlp_spans for traces, otlp_metrics for metrics)
	Topic string `mapstructure:"topic"`

	// Encoding of messages (default "otlp_proto")
	Encoding string `mapstructure:"encoding"`

	// Metadata is the namespace for metadata management properties used by the
	// Client, and shared by the Producer/Consumer.
	Metadata Metadata `mapstructure:"metadata"`

	// Producer is the namespaces for producer properties used only by the Producer
	Producer Producer `mapstructure:"producer"`

	// Authentication defines used authentication mechanism.
	Authentication Authentication `mapstructure:"auth"`
}

Config defines configuration for Kafka exporter.

func (*Config) Validate

func (cfg *Config) Validate() error

Validate checks if the exporter configuration is valid

type FactoryOption

type FactoryOption func(factory *kafkaExporterFactory)

FactoryOption applies changes to kafkaExporterFactory.

func WithTracesMarshalers

func WithTracesMarshalers(tracesMarshalers ...TracesMarshaler) FactoryOption

WithTracesMarshalers adds tracesMarshalers.

type KerberosConfig

type KerberosConfig struct {
	ServiceName string `mapstructure:"service_name"`
	Realm       string `mapstructure:"realm"`
	UseKeyTab   bool   `mapstructure:"use_keytab"`
	Username    string `mapstructure:"username"`
	Password    string `mapstructure:"password" json:"-"`
	ConfigPath  string `mapstructure:"config_file"`
	KeyTabPath  string `mapstructure:"keytab_file"`
}

KerberosConfig defines kereros configuration.

type LogsMarshaler

type LogsMarshaler interface {
	// Marshal serializes logs into sarama's ProducerMessages
	Marshal(logs plog.Logs, topic string) ([]*sarama.ProducerMessage, error)

	// Encoding returns encoding name
	Encoding() string
}

LogsMarshaler marshals logs into Message array

type Metadata

type Metadata struct {
	// Whether to maintain a full set of metadata for all topics, or just
	// the minimal set that has been necessary so far. The full set is simpler
	// and usually more convenient, but can take up a substantial amount of
	// memory if you have many topics and partitions. Defaults to true.
	Full bool `mapstructure:"full"`

	// Retry configuration for metadata.
	// This configuration is useful to avoid race conditions when broker
	// is starting at the same time as collector.
	Retry MetadataRetry `mapstructure:"retry"`
}

Metadata defines configuration for retrieving metadata from the broker.

type MetadataRetry

type MetadataRetry struct {
	// The total number of times to retry a metadata request when the
	// cluster is in the middle of a leader election or at startup (default 3).
	Max int `mapstructure:"max"`
	// How long to wait for leader election to occur before retrying
	// (default 250ms). Similar to the JVM's `retry.backoff.ms`.
	Backoff time.Duration `mapstructure:"backoff"`
}

MetadataRetry defines retry configuration for Metadata.

type MetricsMarshaler

type MetricsMarshaler interface {
	// Marshal serializes metrics into sarama's ProducerMessages
	Marshal(metrics pmetric.Metrics, topic string) ([]*sarama.ProducerMessage, error)

	// Encoding returns encoding name
	Encoding() string
}

MetricsMarshaler marshals metrics into Message array

type PlainTextConfig

type PlainTextConfig struct {
	Username string `mapstructure:"username"`
	Password string `mapstructure:"password"`
}

PlainTextConfig defines plaintext authentication.

type Producer

type Producer struct {
	// Maximum message bytes the producer will accept to produce.
	MaxMessageBytes int `mapstructure:"max_message_bytes"`

	// RequiredAcks Number of acknowledgements required to assume that a message has been sent.
	// https://pkg.go.dev/github.com/Shopify/sarama@v1.30.0#RequiredAcks
	// The options are:
	//   0 -> NoResponse.  doesn't send any response
	//   1 -> WaitForLocal. waits for only the local commit to succeed before responding ( default )
	//   -1 -> WaitForAll. waits for all in-sync replicas to commit before responding.
	RequiredAcks sarama.RequiredAcks `mapstructure:"required_acks"`

	// Compression Codec used to produce messages
	// https://pkg.go.dev/github.com/Shopify/sarama@v1.30.0#CompressionCodec
	// The options are: 'none', 'gzip', 'snappy', 'lz4', and 'zstd'
	Compression string `mapstructure:"compression"`

	// The maximum number of messages the producer will send in a single
	// broker request. Defaults to 0 for unlimited. Similar to
	// `queue.buffering.max.messages` in the JVM producer.
	FlushMaxMessages int `mapstructure:"flush_max_messages"`
}

Producer defines configuration for producer

type SASLConfig

type SASLConfig struct {
	// Username to be used on authentication
	Username string `mapstructure:"username"`
	// Password to be used on authentication
	Password string `mapstructure:"password"`
	// SASL Mechanism to be used, possible values are: (PLAIN, AWS_MSK_IAM, SCRAM-SHA-256 or SCRAM-SHA-512).
	Mechanism string `mapstructure:"mechanism"`

	AWSMSK AWSMSKConfig `mapstructure:"aws_msk"`
}

SASLConfig defines the configuration for the SASL authentication.

type TracesMarshaler

type TracesMarshaler interface {
	// Marshal serializes spans into sarama's ProducerMessages
	Marshal(traces ptrace.Traces, topic string) ([]*sarama.ProducerMessage, error)

	// Encoding returns encoding name
	Encoding() string
}

TracesMarshaler marshals traces into Message array.

type XDGSCRAMClient

type XDGSCRAMClient struct {
	*scram.Client
	*scram.ClientConversation
	scram.HashGeneratorFcn
}

XDGSCRAMClient uses xdg-go scram to authentication conversation

func (*XDGSCRAMClient) Begin

func (x *XDGSCRAMClient) Begin(userName, password, authzID string) (err error)

Begin starts the XDGSCRAMClient conversation.

func (*XDGSCRAMClient) Done

func (x *XDGSCRAMClient) Done() bool

Done returns true if the conversation is completed or has errored.

func (*XDGSCRAMClient) Step

func (x *XDGSCRAMClient) Step(challenge string) (response string, err error)

Step takes a string provided from a server (or just an empty string for the very first conversation step) and attempts to move the authentication conversation forward. It returns a string to be sent to the server or an error if the server message is invalid. Calling Step after a conversation completes is also an error.