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Clarify protocol defaults on specification #4585

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carlosalberto merged 5 commits into from
Jul 23, 2025
Merged

Clarify protocol defaults on specification #4585

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43a1f56
Clarify protocol defaults on specification
gustavo-vargas-leon Jul 10, 2025
29404b2
Merge branch 'main' into clarify-protocol-defaults
cijothomas Jul 16, 2025
dd41ae1
Merge branch 'main' into clarify-protocol-defaults
pellared Jul 21, 2025
0509391
Merge branch 'main' into clarify-protocol-defaults
pellared Jul 22, 2025
ec1186a
Merge branch 'main' into clarify-protocol-defaults
carlosalberto Jul 23, 2025
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4 changes: 3 additions & 1 deletion specification/protocol/exporter.md
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Expand Up @@ -70,7 +70,7 @@ Each configuration option MUST be overridable by a signal specific option.

- **Protocol**: The transport protocol. Options MUST be one of: `grpc`, `http/protobuf`, `http/json`.
See [Specify Protocol](./exporter.md#specify-protocol) for more details.
- Default: `http/protobuf`
- Default: `http/protobuf` [4]
- Env vars: `OTEL_EXPORTER_OTLP_PROTOCOL` `OTEL_EXPORTER_OTLP_TRACES_PROTOCOL` `OTEL_EXPORTER_OTLP_METRICS_PROTOCOL` `OTEL_EXPORTER_OTLP_LOGS_PROTOCOL`
- Type: [Enum][]

Expand All @@ -86,6 +86,8 @@ they SHOULD continue to be supported as they were part of a stable release of th
most useful among the supported options. This is especially important in the presence of technical constraints,
e.g. directly sending telemetry data from mobile devices to backend servers.

**[4]**: The default protocol SHOULD be `http/protobuf`, unless there are strong reasons for SDKs to select `grpc` as the default. For instance, maintaining backward compatibility may require keeping `grpc` as the default if it was previously established in a stable SDK release.

Supported values for `OTEL_EXPORTER_OTLP_*COMPRESSION` options:

- `none` if compression is disabled.
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