add metrics

Signed-off-by: LiHui <andrewli@yunify.com>

pkg/simple/client/metrics/metrics.go

@@ -0,0 +1,24 @@
+package metrics
+
+import "github.com/spf13/pflag"
+
+type Options struct {
+	Enable bool `json:"enable,omitempty" description:"enable metric"`
+}
+
+func NewMetricsOptions() *Options {
+	return &Options{
+		Enable: false,
+	}
+}
+
+func (s *Options) ApplyTo(options *Options) {
+	if options == nil {
+		options = s
+		return
+	}
+}
+
+func (s *Options) AddFlags(fs *pflag.FlagSet, c *Options) {
+	fs.BoolVar(&s.Enable, "enable-metric", c.Enable, "If true, allow metric. [default=false]")
+}