Logger can be provided to log Reporter errors, as well as to log spans if Reporter.LogSpans is set to true.

Metrics creates an Option that initializes Metrics in the tracer, which is used to emit statistics about spans.

Observer can be registered with the Tracer to receive notifications about new Spans.

Reporter can be provided explicitly to override the configuration.

Tag creates an option that adds a tracer-level tag.

ZipkinSharedRPCSpan creates an option that enables sharing span ID between client and server spans a la zipkin.

Configuration configures and creates Jaeger Tracer.

Options control behavior of the client.

ReporterConfig configures the reporter.

SamplerConfig allows initializing a non-default sampler.

Option is a function that sets some option on the client.