tracing

type Service interface {
	// Reload service (useful for configuration change).
	Reload() error
	// Get global tracer object.
	GetTracer() opentracing.Tracer
}

type Trace interface {
	// Set tag on trace.
	SetTag(key string, value interface{})
	// Get child trace with an operation name.
	GetChildTrace(operationName string) Trace
	// Will finish the trace.
	Finish()
	// Get trace id as a string (useful for logs).
	GetTraceID() string
	// InjectInHTTPHeader will inject span in http header for forwarding.
	InjectInHTTPHeader(header http.Header) error
}