code: def set_zipkin_exporter():
      from opentelemetry.exporter.zipkin.proto.http import (
          ZipkinExporter,
      )
  
      span_exporter = ZipkinExporter(
          endpoint=ZIPKIN_ENDPOINT,
      )
      return span_exporter
  
imports: import sys
  from metaflow.metaflow_config import OTEL_ENDPOINT, ZIPKIN_ENDPOINT, CONSOLE_TRACE_ENABLED
label_desc: Use image node_id 3 for calling a global function with example usage: set_zipkin_exporter() and returns: span_exporter