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OpenTelemetry Baggage enables propagation of arbitrary metadata (like customer IDs or feature flags) across distributed services without manual parameter passing. It solves parameter drilling by automatically propagating key-value pairs through service boundaries, eliminating tight coupling and reducing maintenance overhead. Baggage can also drive real-time application logic, such as A/B testing decisions. The article includes a hands-on Python demo with three microservices (frontend, pricing, processor) that demonstrates automatic baggage propagation and visualization using SigNoz.