align warmup aggression with envoy (#3602)

* align warmup aggression with envoy

* fix test

Author: zirain

kubernetes/customresourcedefinitions.gen.yaml

@@ -564,7 +564,7 @@ message WarmupConfiguration {
   // This parameter controls the speed of traffic increase over the warmup duration. Defaults to 1.0, so that endpoints would
   // get linearly increasing amount of traffic. When increasing the value for this parameter,
   // the speed of traffic ramp-up increases non-linearly.
-  // +kubebuilder:validation:Minimum=1
+  // +kubebuilder:validation:Minimum=0
   google.protobuf.DoubleValue aggression = 3;
 }
 

networking/v1alpha3/destination_rule.pb.go

@@ -34,4 +34,4 @@ spec:
     loadBalancer:
       warmup:
         duration: 300s
-        aggression: 0.3
+        aggression: -0.1