Cargo Features

spring-opentelemetry has no features set by default.

[dependencies]
spring-opentelemetry = { version = "0.2.1", features = ["jaeger", "zipkin", "more-resource"] }
jaeger = opentelemetry-jaeger-propagator
zipkin = opentelemetry-zipkin
more-resource = opentelemetry-resource-detectors

Features from optional dependencies

In crates that don't use the dep: syntax, optional dependencies automatically become Cargo features. These features may have been created by mistake, and this functionality may be removed in the future.

opentelemetry-jaeger-propagator jaeger?
opentelemetry-zipkin zipkin?
opentelemetry-resource-detectors more-resource?