add global outlier detection

Signed-off-by: yangyang <[email protected]>

internal/dag/httpproxy_processor.go

@@ -112,6 +112,9 @@ type HTTPProxyProcessor struct {
 	// configurable and off by default in order to support the feature
 	// without requiring all existing test cases to change.
 	SetSourceMetadataOnRoutes bool
+
+	// GlobalOutlierDetection defines route-service's Global Outlier Detection configuration.
+	GlobalOutlierDetection *contour_api_v1.OutlierDetection
 }
 
 // Run translates HTTPProxies into DAG objects and
@@ -981,7 +984,7 @@ func (p *HTTPProxyProcessor) computeRoutes(
 				return nil
 			}
 
-			outlierDetection, err := outlierDetectionPolicy(service.OutlierDetection)
+			outlierDetection, err := outlierDetectionPolicy(p.GlobalOutlierDetection, service.OutlierDetection)
 			if err != nil {
 				validCond.AddErrorf(contour_api_v1.ConditionTypeOutlierDetectionError, "OutlierDetectionInvalid",
 					"%s on outlier detection", err)