OpenTelemetry Protocol (OTLP)

1. Protocol details overview

   Request/response model for traces, metrics, logs and profiles.

2. OTLP/gRPC

   Unary export calls, concurrent requests, throttling and default port 4317.

3. Full success, partial success and failures

   Response semantics and retry behavior.

4. OTLP/HTTP

   HTTP POST endpoints /v1/traces, /v1/metrics, /v1/logs on port 4318.

5. Binary Protobuf encoding

   application/x-protobuf payloads.

6. JSON Protobuf encoding

   JSON mapping rules including hex trace IDs.

7. Implementation recommendations

   Retry, throttling and batching guidance.

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