# Functions
AddHook returns a configurer to set request hook.
CustomTracer returns a configurer to set custom tracer.
DefaultTracer returns a configurer to create default tracer by service and port.
Disable returns a configurer to disable tracing.
NewDefaultOption creates default option.
# Constants
ExternalConfigName is the external config name of tracing.
HeaderRequestID is request id.
# Structs
DefaultHook is an default hook, it will record X-Request-ID from http headers.
Option contains basic configurations of tracing.
# Interfaces
Hook allows you to custom information for span.