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Did you specify the

OTEL_EXPORTER_OTLP_ENDPOINT

environment variable? Looks like it's trying to post traces to 127.0.0.1:4318, which if you're running GrowthBook in a docker container, is not going to work since 127.0.0.1 points to localhost within the docker network, not the host machine.

ah ok that makes sense. Thanks Jeremy

There are some instructions at https://docs.datadoghq.com/opentelemetry/otlp_ingest_in_the_agent/?tab=host for how to send metrics and traces to a datadog agent

thans, will take a look at those