Extension of Diagnosis

// ProbeName is the name of probe.
type ProbeName string

// ProbeFunc is used to get probe data, it is usually a data dump func.
type ProbeFunc func() interface{}

// Service is the interface for debug service.
type Service interface {
   // RegisterProbeFunc is used to register ProbeFunc with probe name
   // ProbeFunc is usually a dump func that to dump info to do problem diagnosis,
   // eg: CBSuite.Dump(), s.RegisterProbeFunc(CircuitInfoKey, cbs.Dump)
   RegisterProbeFunc(ProbeName, ProbeFunc)
}

// new diagnosisi service
var ds diagnosis.service = NewYourService()

// eg: register dump func to get discovery instances.
ds.RegisterProbeFunc("instances", dr.Dump)

// eg: wrap the config data as probe func, register func to get config info.
ds.RegisterProbeFunc("config_info", diagnosis.WrapAsProbeFunc(config))

const (
	// Common
	ChangeEventsKey ProbeName = "events"
	ServiceInfoKey  ProbeName = "service_info"
	OptionsKey      ProbeName = "options"

	// Client
	DestServiceKey ProbeName = "dest_service"
	ConnPoolKey    ProbeName = "conn_pool"
	RetryPolicyKey ProbeName = "retry_policy"
)

// server side
svr := xxxservice.NewServer(handler, server.WithDiagnosisService(yourDiagnosisService))

// client side
cli, err := xxxservice.NewClient(targetService, client.WithDiagnosisService(yourDiagnosisService))