opentelemetry-collector/receiver/otlpreceiver/README.md

OTLP Receiver

Status
Stability	development: profiles
	stable: traces, metrics, logs
Distributions	core, contrib, k8s, otlp
Issues

Receives data via gRPC or HTTP using OTLP format.

Getting Started

All that is required to enable the OTLP receiver is to include it in the receiver definitions. A protocol can be disabled by simply not specifying it in the list of protocols.

receivers:
  otlp:
    protocols:
      grpc:
      http:

The following settings are configurable:

• endpoint (default = localhost:4317 for grpc protocol, localhost:4318 http protocol): host:port to which the receiver is going to receive data. The valid syntax is described at https://github.com/grpc/grpc/blob/master/doc/naming.md. See our security best practices doc to understand how to set the endpoint in different environments.

Advanced Configuration

Several helper files are leveraged to provide additional capabilities automatically:

• gRPC settings including CORS
• HTTP settings
• TLS and mTLS settings
• Auth settings

Writing with HTTP/JSON

The OTLP receiver can receive trace export calls via HTTP/JSON in addition to gRPC. The HTTP/JSON address is the same as gRPC as the protocol is recognized and processed accordingly. Note the serialization format needs to be OTLP JSON.

The HTTP/JSON configuration also provides traces_url_path, metrics_url_path, logs_url_path, and profiles_url_path configurations to allow the URL paths that signal data needs to be sent to be modified per signal type. These default to /v1/traces, /v1/metrics, /v1/logs, and /v1/profiles respectively.

To write traces with HTTP/JSON, POST to [address]/[traces_url_path] for traces, to [address]/[metrics_url_path] for metrics, to [address]/[logs_url_path] for logs, and to [address]/[profiles_url_path] for profiles. The default port is 4318. When using the otlphttpexporter peer to communicate with this component, use the traces_endpoint, metrics_endpoint, logs_endpoint, and profiles_endpoint settings in the otlphttpexporter to set the proper URL to match the address and URL signal path on the otlpreceiver.

CORS (Cross-origin resource sharing)

The HTTP/JSON endpoint can also optionally configure CORS under cors:. Specify what origins (or wildcard patterns) to allow requests from as allowed_origins. To allow additional request headers outside of the default safelist, set allowed_headers. Browsers can be instructed to cache responses to preflight requests by setting max_age.

receivers:
  otlp:
    protocols:
      http:
        endpoint: "localhost:4318"
        cors:
          allowed_origins:
            - http://test.com
            # Origins can have wildcards with *, use * by itself to match any origin.
            - https://*.example.com
          allowed_headers:
            - Example-Header
          max_age: 7200