The `spring.sleuth.baggage-keys` property assigned two headers for each
baggage. This causes unnecessary overhead and can be accomplished in another
way now:
```java
public class MyCode {
static final BaggageField USER_ID = BaggageField.create("userId");
@Autowired CurrentTraceContext currentTraceContext;
@Nullable
public String currentUserId() {
return USER_ID.getValue(currentTraceContext.get());
}
}
// In your @Configuration type, if you want to map multiple prefixes...
@Bean
BaggagePropagationConfig userIdBaggageConfig() {
return SingleBaggageField.newBuilder(MyBaggage.USER_ID)
.addKeyName("baggage-userId")
.addKeyName("baggage_userId")
.build();
}
```
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