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The example calling `OpentelemetryProcessPropagator.fetch_parent_ctx` was passing the key to the `/1` arity function, which is not the argument it expects. To specify the key you also need to specify the depth first, using the `/2` arity function: `OpentelemetryProcessPropagator.fetch_parent_ctx(depth, key)`
Opentelemetry Process Propagator
Functions for cross-process opentelemetry context propagation.