diff --git a/docs/serving/samples/knative-routing-go/sample.yaml b/docs/serving/samples/knative-routing-go/sample.yaml
index 1566ae5062..b14ce8d269 100644
--- a/docs/serving/samples/knative-routing-go/sample.yaml
+++ b/docs/serving/samples/knative-routing-go/sample.yaml
@@ -31,7 +31,6 @@ spec:
           httpGet:
             path: /
           initialDelaySeconds: 3
-          periodSeconds: 3
 ---
 apiVersion: serving.knative.dev/v1
 kind: Service
@@ -52,4 +51,3 @@ spec:
           httpGet:
             path: /
           initialDelaySeconds: 3
-          periodSeconds: 3
diff --git a/docs/serving/samples/rest-api-go/sample.yaml b/docs/serving/samples/rest-api-go/sample.yaml
index 708a78b6b1..a5e36d0333 100644
--- a/docs/serving/samples/rest-api-go/sample.yaml
+++ b/docs/serving/samples/rest-api-go/sample.yaml
@@ -30,5 +30,4 @@ spec:
           httpGet:
             path: /
           initialDelaySeconds: 0
-          periodSeconds: 3
 
diff --git a/docs/serving/samples/traffic-splitting/release_sample.yaml b/docs/serving/samples/traffic-splitting/release_sample.yaml
index 20b52ea9a1..b0578d180b 100644
--- a/docs/serving/samples/traffic-splitting/release_sample.yaml
+++ b/docs/serving/samples/traffic-splitting/release_sample.yaml
@@ -31,7 +31,6 @@ spec:
           httpGet:
             path: /
           initialDelaySeconds: 0
-          periodSeconds: 3
   traffic:
   - tag: current
     revisionName: stock-service-example-first
diff --git a/docs/serving/samples/traffic-splitting/split_sample.yaml b/docs/serving/samples/traffic-splitting/split_sample.yaml
index 3099793635..a499f70c7a 100644
--- a/docs/serving/samples/traffic-splitting/split_sample.yaml
+++ b/docs/serving/samples/traffic-splitting/split_sample.yaml
@@ -31,7 +31,6 @@ spec:
           httpGet:
             path: /
           initialDelaySeconds: 0
-          periodSeconds: 3
   traffic:
   - tag: current
     revisionName: stock-service-example-first
diff --git a/docs/serving/samples/traffic-splitting/updated_sample.yaml b/docs/serving/samples/traffic-splitting/updated_sample.yaml
index d32d3c38bb..1f971a862e 100644
--- a/docs/serving/samples/traffic-splitting/updated_sample.yaml
+++ b/docs/serving/samples/traffic-splitting/updated_sample.yaml
@@ -31,7 +31,6 @@ spec:
           httpGet:
             path: /
           initialDelaySeconds: 0
-          periodSeconds: 3
   traffic:
   - tag: current
     revisionName: stock-service-example-first