diff --git a/artifacts/flagger/crd.yaml b/artifacts/flagger/crd.yaml
index a38c927d..106cb1ff 100644
--- a/artifacts/flagger/crd.yaml
+++ b/artifacts/flagger/crd.yaml
@@ -100,6 +100,8 @@ spec:
                           pattern: "^[0-9]+(m|s)"
                         threshold:
                           type: number
+                        query:
+                          type: string
                 webhooks:
                   type: array
                   properties:
diff --git a/charts/flagger/templates/crd.yaml b/charts/flagger/templates/crd.yaml
index 4d9527f7..0fd89e01 100644
--- a/charts/flagger/templates/crd.yaml
+++ b/charts/flagger/templates/crd.yaml
@@ -101,6 +101,8 @@ spec:
                           pattern: "^[0-9]+(m|s)"
                         threshold:
                           type: number
+                        query:
+                          type: string
                 webhooks:
                   type: array
                   properties:
diff --git a/pkg/apis/flagger/v1alpha3/types.go b/pkg/apis/flagger/v1alpha3/types.go
index 628c5dda..5829e954 100755
--- a/pkg/apis/flagger/v1alpha3/types.go
+++ b/pkg/apis/flagger/v1alpha3/types.go
@@ -127,9 +127,11 @@ type CanaryAnalysis struct {
 
 // CanaryMetric holds the reference to Istio metrics used for canary analysis
 type CanaryMetric struct {
-	Name      string `json:"name"`
-	Interval  string `json:"interval"`
-	Threshold int    `json:"threshold"`
+	Name      string  `json:"name"`
+	Interval  string  `json:"interval"`
+	Threshold float64 `json:"threshold"`
+	// +optional
+	Query string `json:"query,omitempty"`
 }
 
 // CanaryWebhook holds the reference to external checks used for canary analysis