Initialize webserver with the listening address.

agent/agent.go

@@ -327,8 +327,7 @@ func (a *Agent) Run(shutdown chan struct{}) error {
 
 	// channel shared between all input threads for accumulating metrics
 	metricC := make(chan telegraf.Metric, 10000)
-	webserver := webserver.NewWebserver()
-	webserver.ServiceAddress = a.Config.Agent.WebhookServiceAddress
+	webserver := webserver.NewWebserver(a.Config.Agent.WebhookServiceAddress)
 
 	for _, input := range a.Config.Inputs {
 		// Start service of any ServicePlugins

internal/webserver/webserver.go

@@ -13,8 +13,8 @@ type Webserver struct {
 	router         *mux.Router
 }
 
-func NewWebserver() *Webserver {
-	return &Webserver{router: mux.NewRouter()}
+func NewWebserver(serviceAddress string) *Webserver {
+	return &Webserver{Router: mux.NewRouter(), ServiceAddress: serviceAddress}
 }
 
 func (wb *Webserver) Router() *mux.Router {