update primary scaler query handling to consider mutliple triggers

Signed-off-by: Sanskar Jaiswal <sanskar.jaiswal@weave.works>

pkg/apis/flagger/v1beta1/canary.go

@@ -425,10 +425,10 @@ type AutoscalerRefernce struct {
 	// Name of the scaler
 	Name string `json:"name"`
 
-	// PrimaryScalerQuery is the query to use for the primary scaler, if
-	// Flagger generates one.
+	// PrimaryScalerQueries maps a unique id to a query for the primary
+	// scaler, if a scaler supports scaling using queries.
 	// +optional
-	PrimaryScalerQuery string `json:"primaryScalerQuery"`
+	PrimaryScalerQueries map[string]string `json:"primaryScalerQueries"`
 }
 
 // CustomMetadata holds labels and annotations to set on generated objects.

pkg/apis/flagger/v1beta1/zz_generated.deepcopy.go

@@ -154,6 +154,13 @@ func (in *AlertProviderStatus) DeepCopy() *AlertProviderStatus {
 // DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
 func (in *AutoscalerRefernce) DeepCopyInto(out *AutoscalerRefernce) {
 	*out = *in
+	if in.PrimaryScalerQueries != nil {
+		in, out := &in.PrimaryScalerQueries, &out.PrimaryScalerQueries
+		*out = make(map[string]string, len(*in))
+		for key, val := range *in {
+			(*out)[key] = val
+		}
+	}
 	return
 }
 
@@ -439,7 +446,7 @@ func (in *CanarySpec) DeepCopyInto(out *CanarySpec) {
 	if in.AutoscalerRef != nil {
 		in, out := &in.AutoscalerRef, &out.AutoscalerRef
 		*out = new(AutoscalerRefernce)
-		**out = **in
+		(*in).DeepCopyInto(*out)
 	}
 	if in.IngressRef != nil {
 		in, out := &in.IngressRef, &out.IngressRef