Reduce metrics mechanism to just support fastdp

router/overlay_switch.go

@@ -42,29 +42,14 @@ func (osw *OverlaySwitch) AddFeaturesTo(features map[string]string) {
 	features["Overlays"] = strings.Join(osw.overlayNames, " ")
 }
 
-type OverlaySwitchDiagnostics map[string]interface{}
-
 func (osw *OverlaySwitch) Diagnostics() interface{} {
-	diagnostics := make(OverlaySwitchDiagnostics)
+	diagnostics := make(map[string]interface{})
 	for name, overlay := range osw.overlays {
 		diagnostics[name] = overlay.Diagnostics()
 	}
 	return diagnostics
 }
 
-type MetricsReporter interface {
-	Metrics() interface{}
-}
-
-func (d OverlaySwitchDiagnostics) Metrics() interface{} {
-	for _, entry := range d {
-		if fastDPEntry, ok := entry.(MetricsReporter); ok {
-			return fastDPEntry.Metrics()
-		}
-	}
-	return nil
-}
-
 func (osw *OverlaySwitch) InvalidateRoutes() {
 	for _, overlay := range osw.overlays {
 		overlay.InvalidateRoutes()