structure for observatory

features/extension/observatory.go

@@ -0,0 +1,17 @@
+package extension
+
+import (
+	"context"
+	"github.com/golang/protobuf/proto"
+	"github.com/v2fly/v2ray-core/v4/features"
+)
+
+type Observatory interface {
+	features.Feature
+
+	GetObservation(ctx context.Context) (proto.Message, error)
+}
+
+func ObservatoryType() interface{} {
+	return (*Observatory)(nil)
+}