OpenTelemetry

An input plugin to ingest OTLP Logs, Metrics, and Traces

The OpenTelemetry input plugin allows you to receive data as per the OTLP specification, from various OpenTelemetry exporters, the OpenTelemetry Collector, or Fluent Bit's OpenTelemetry output plugin.

Our compliant implementation fully supports OTLP/HTTP and OTLP/GRPC. Note that the single port configured which defaults to 4318 supports both transports.

Configuration

Key	Description	default
listen	The network address to listen.	0.0.0.0
port	The port for Fluent Bit to listen for incoming connections. Note that as of Fluent Bit v3.0.2 this port is used for both transport OTLP/HTTP and OTLP/GRPC.	4318
tag_key	Specify the key name to overwrite a tag. If set, the tag will be overwritten by a value of the
raw_traces	Route trace data as a log	false
buffer_max_size	Specify the maximum buffer size in KB/MB/GB to the HTTP payload.	4M
buffer_chunk_size	Initial size and allocation strategy to store the payload (advanced users only)	512K
successful_response_code	It allows to set successful response code. 200, 201 and 204 are supported.	201
tag_from_uri	If true, tag will be created from uri. e.g. v1_metrics from /v1/metrics .	true

Important note: Raw traces means that any data forwarded to the traces endpoint (/v1/traces) will be packed and forwarded as a log message, and will NOT be processed by Fluent Bit. The traces endpoint by default expects a valid protobuf encoded payload, but you can set the raw_traces option in case you want to get trace telemetry data to any of Fluent Bit's supported outputs.

OTLP Transport Protocol Endpoints

Fluent Bit based on the OTLP desired protocol exposes the following endpoints for data ingestion:

OTLP/HTTP

• Logs

  • /v1/logs

• Metrics

  • /v1/metrics

• Traces

  • /v1/traces

OTLP/GRPC

• Logs

  • /opentelemetry.proto.collector.log.v1.LogService/Export

  • /opentelemetry.proto.collector.log.v1.LogService/Export

• Metrics

  • /opentelemetry.proto.collector.metric.v1.MetricService/Export

  • /opentelemetry.proto.collector.metrics.v1.MetricsService/Export

• Traces

  • /opentelemetry.proto.collector.trace.v1.TraceService/Export

  • /opentelemetry.proto.collector.traces.v1.TracesService/Export

Getting started

The OpenTelemetry plugin currently supports the following telemetry data types:

Type	HTTP/JSON	HTTP/Protobuf
Logs	Stable	Stable
Metrics	Unimplemented	Stable
Traces	Unimplemented	Stable

A sample config file to get started will look something like the following:

fluent-bit.yaml

pipeline:
    inputs:
        - name: opentelemetry
          listen: 127.0.0.1
          port: 4318
    outputs:
        - name: stdout
          match: '*'

fluent-bit.conf

[INPUT]
	name opentelemetry
	listen 127.0.0.1
	port 4318

[OUTPUT]
	name stdout
	match *

With the above configuration, Fluent Bit will listen on port 4318 for data. You can now send telemetry data to the endpoints /v1/metrics, /v1/traces, and /v1/logs for metrics, traces, and logs respectively.

A sample curl request to POST json encoded log data would be:

curl --header "Content-Type: application/json" --request POST --data '{"resourceLogs":[{"resource":{},"scopeLogs":[{"scope":{},"logRecords":[{"timeUnixNano":"1660296023390371588","body":{"stringValue":"{\"message\":\"dummy\"}"},"traceId":"","spanId":""}]}]}]}'   http://0.0.0.0:4318/v1/logs