You can run this example with different exporters by providing environment variables.
Stdout exporter (default):
go run .
Jaeger exporter:
OTEL_EXPORTER_JAEGER_ENDPOINT=http://localhost:14268/api/traces go run .
Uptrace exporter:
UPTRACE_DSN="https://<token>@uptrace.dev/<project_id>" go run .
See otelzap for documentation.