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docs: document OTLP gRPC exporter (2.8) #3083

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4 changes: 4 additions & 0 deletions runtime/fundamentals/open_telemetry.md
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Expand Up @@ -658,6 +658,10 @@ variables. Supported values for `OTEL_EXPORTER_OTLP_PROTOCOL` are:
- `http/protobuf` (default): Export using Protobuf over HTTP to the configured
endpoint.
- `http/json`: Export using JSON over HTTP to the configured endpoint.
- `grpc`: Export using gRPC (Protobuf over HTTP/2). Available in Deno 2.8+.
Useful for collectors that only accept gRPC, such as Azure Container Apps'
managed OpenTelemetry agent. The default OTLP gRPC port is `4317`, so you
typically also set `OTEL_EXPORTER_OTLP_ENDPOINT=http://localhost:4317`.
- `console`: Print spans, logs, and metrics to stderr in a human-readable text
format. This is useful for debugging and testing instrumentation without
running an OTLP collector. When using `console`, no endpoint configuration is
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