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Pin OTEL_EXPORTER_OTLP_PROTOCOL=http/protobuf #62

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Merged
prim-8 merged 1 commit into from
Apr 29, 2026
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Pin OTEL_EXPORTER_OTLP_PROTOCOL=http/protobuf #62

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10 changes: 9 additions & 1 deletion milter/entrypoint.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -149,11 +149,19 @@ fi
if [ "${OTEL_TRACING_ENABLED:-false}" = "true" ]; then
export OTEL_SERVICE_NAME="${OTEL_SERVICE_NAME:-milter}"
export OTEL_EXPORTER_OTLP_ENDPOINT="${OTEL_EXPORTER_OTLP_ENDPOINT:-http://localhost:4318}"
# The Dockerfile installs only the HTTP variant of the OTLP exporter
# (opentelemetry-exporter-otlp-proto-http). The OTel spec defaults
# the protocol to grpc, which makes opentelemetry-instrument try
# to load a gRPC exporter that isn't installed and raise:
# "Requested component 'otlp_proto_grpc' not found in entry
# point 'opentelemetry_traces_exporter'"
# Pin the protocol so the right exporter is selected.
export OTEL_EXPORTER_OTLP_PROTOCOL="${OTEL_EXPORTER_OTLP_PROTOCOL:-http/protobuf}"
# tracecontext + baggage are the W3C-standard propagators; matches what
# ddtrace emits when DD_TRACE_PROPAGATION_STYLE includes tracecontext, so
# cross-service trace continuity holds regardless of which SDK is active.
export OTEL_PROPAGATORS="${OTEL_PROPAGATORS:-tracecontext,baggage}"
echo "OpenTelemetry tracing enabled (service=${OTEL_SERVICE_NAME}, endpoint=${OTEL_EXPORTER_OTLP_ENDPOINT})"
echo "OpenTelemetry tracing enabled (service=${OTEL_SERVICE_NAME}, endpoint=${OTEL_EXPORTER_OTLP_ENDPOINT}, protocol=${OTEL_EXPORTER_OTLP_PROTOCOL})"
fi

# Start the milter in background (MUST be running before Postfix starts).
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