Construct a composite propagator from a list of propagators.
Optionalconfig: core.CompositePropagatorConfigConfiguration object for composite propagator
Run each of the configured propagators with the given context and carrier. Propagators are run in the order they are configured, so if multiple propagators write the same context key, the propagator later in the list will "win".
Context to add values to
Carrier from which to extract context
Return a list of all fields which may be used by the propagator.
Run each of the configured propagators with the given context and carrier. Propagators are run in the order they are configured, so if multiple propagators write the same carrier key, the propagator later in the list will "win".
Context to inject
Carrier into which context will be injected
Combines multiple propagators into a single propagator.