in lib/skywalking/segment_ref.lua [61:72]
function _M.createInjectableRef(context, span)
local injectableRef = _M.new()
injectableRef.trace_id = context.trace_id
injectableRef.segment_id = context.segment_id
injectableRef.span_id = span.span_id
injectableRef.address_used_at_client = span.peer
injectableRef.parent_service = context.service
injectableRef.parent_service_instance = context.service_instance
injectableRef.parent_endpoint = span.parent_endpoint_name
return injectableRef
end