Первая реализация, добавил поддержку конфига

config/config.go

@@ -0,0 +1,42 @@
+package config
+
+import (
+	"log"
+	"os"
+
+	"gopkg.in/yaml.v3"
+)
+
+type target struct {
+	Instance string `yaml:"instance"`
+	UserID   string `yaml:"userID"`
+}
+
+type exporter struct {
+	Listen string `yaml:"listen"`
+	Port   string `yaml:"port"`
+}
+
+type InstanceVars struct {
+	Target   target   `yaml:"target"`
+	Exporter exporter `yaml:"exporter"`
+}
+
+func OpenFile(path string) []byte {
+	file, err := os.ReadFile(path)
+	if err != nil {
+		log.Println(err)
+	}
+	return file
+}
+
+func UnmYamlConfig(path string) InstanceVars {
+	fileContent := OpenFile(path)
+	var config InstanceVars
+
+	err := yaml.Unmarshal(fileContent, &config)
+	if err != nil {
+		log.Println(err)
+	}
+	return config
+}