diff --git a/internal/xds/translator/testdata/in/xds-ir/http-req-resp-sizes-stats.yaml b/internal/xds/translator/testdata/in/xds-ir/http-req-resp-sizes-stats.yaml
new file mode 100644
index 00000000000..5c174e363ef
--- /dev/null
+++ b/internal/xds/translator/testdata/in/xds-ir/http-req-resp-sizes-stats.yaml
@@ -0,0 +1,21 @@
+name: "metrics-req-resp-sizes-stats"
+metrics:
+  enableRequestResponseSizesStats: true
+http:
+  - name: "listener-enable-req-resp-sizes-stats"
+    address: "0.0.0.0"
+    port: 10080
+    hostnames:
+      - "*"
+    path:
+      mergeSlashes: true
+      escapedSlashesAction: UnescapeAndRedirect
+    routes:
+      - name: "first-route"
+        hostname: "*"
+        destination:
+          name: "first-route-dest"
+          settings:
+            - endpoints:
+                - host: "1.2.3.4"
+                  port: 50000
diff --git a/internal/xds/translator/testdata/in/xds-ir/tcp-req-resp-sizes-stats.yaml b/internal/xds/translator/testdata/in/xds-ir/tcp-req-resp-sizes-stats.yaml
new file mode 100644
index 00000000000..6d5d7fac73c
--- /dev/null
+++ b/internal/xds/translator/testdata/in/xds-ir/tcp-req-resp-sizes-stats.yaml
@@ -0,0 +1,15 @@
+name: "metrics-req-resp-sizes-stats"
+metrics:
+  enableRequestResponseSizesStats: true
+tcp:
+- name: "tcp-route-enable-req-resp-sizes-stats"
+  address: "0.0.0.0"
+  port: 10080
+  destination:
+    name: "tcp-route-simple-dest"
+    settings:
+    - endpoints:
+      - host: "1.2.3.4"
+        port: 50000
+      - host: "5.6.7.8"
+        port: 50001
diff --git a/internal/xds/translator/testdata/in/xds-ir/udp-req-resp-sizes-stats.yaml b/internal/xds/translator/testdata/in/xds-ir/udp-req-resp-sizes-stats.yaml
new file mode 100644
index 00000000000..1e7e0d9fb53
--- /dev/null
+++ b/internal/xds/translator/testdata/in/xds-ir/udp-req-resp-sizes-stats.yaml
@@ -0,0 +1,17 @@
+name: "metrics-req-resp-sizes-stats"
+metrics:
+  enableRequestResponseSizesStats: true
+udp:
+- name: "udp-route-enable-req-resp-sizes-stats"
+  address: "0.0.0.0"
+  port: 10080
+  route:
+    name: "udp-route"
+    destination:
+      name: "udp-route-dest"
+      settings:
+      - endpoints:
+        - host: "1.2.3.4"
+          port: 50000
+        - host: "5.6.7.8"
+          port: 50001
diff --git a/internal/xds/translator/testdata/out/xds-ir/http-req-resp-sizes-stats.clusters.yaml b/internal/xds/translator/testdata/out/xds-ir/http-req-resp-sizes-stats.clusters.yaml
new file mode 100644
index 00000000000..7d112afb676
--- /dev/null
+++ b/internal/xds/translator/testdata/out/xds-ir/http-req-resp-sizes-stats.clusters.yaml
@@ -0,0 +1,19 @@
+- circuitBreakers:
+    thresholds:
+    - maxRetries: 1024
+  commonLbConfig:
+    localityWeightedLbConfig: {}
+  connectTimeout: 10s
+  dnsLookupFamily: V4_ONLY
+  edsClusterConfig:
+    edsConfig:
+      ads: {}
+      resourceApiVersion: V3
+    serviceName: first-route-dest
+  lbPolicy: LEAST_REQUEST
+  name: first-route-dest
+  outlierDetection: {}
+  perConnectionBufferLimitBytes: 32768
+  trackClusterStats:
+    requestResponseSizes: true
+  type: EDS
diff --git a/internal/xds/translator/testdata/out/xds-ir/http-req-resp-sizes-stats.endpoints.yaml b/internal/xds/translator/testdata/out/xds-ir/http-req-resp-sizes-stats.endpoints.yaml
new file mode 100644
index 00000000000..3b3f2d09076
--- /dev/null
+++ b/internal/xds/translator/testdata/out/xds-ir/http-req-resp-sizes-stats.endpoints.yaml
@@ -0,0 +1,12 @@
+- clusterName: first-route-dest
+  endpoints:
+  - lbEndpoints:
+    - endpoint:
+        address:
+          socketAddress:
+            address: 1.2.3.4
+            portValue: 50000
+      loadBalancingWeight: 1
+    loadBalancingWeight: 1
+    locality:
+      region: first-route-dest/backend/0
diff --git a/internal/xds/translator/testdata/out/xds-ir/http-req-resp-sizes-stats.listeners.yaml b/internal/xds/translator/testdata/out/xds-ir/http-req-resp-sizes-stats.listeners.yaml
new file mode 100644
index 00000000000..2d688753f05
--- /dev/null
+++ b/internal/xds/translator/testdata/out/xds-ir/http-req-resp-sizes-stats.listeners.yaml
@@ -0,0 +1,34 @@
+- address:
+    socketAddress:
+      address: 0.0.0.0
+      portValue: 10080
+  defaultFilterChain:
+    filters:
+    - name: envoy.filters.network.http_connection_manager
+      typedConfig:
+        '@type': type.googleapis.com/envoy.extensions.filters.network.http_connection_manager.v3.HttpConnectionManager
+        commonHttpProtocolOptions:
+          headersWithUnderscoresAction: REJECT_REQUEST
+        http2ProtocolOptions:
+          initialConnectionWindowSize: 1048576
+          initialStreamWindowSize: 65536
+          maxConcurrentStreams: 100
+        httpFilters:
+        - name: envoy.filters.http.router
+          typedConfig:
+            '@type': type.googleapis.com/envoy.extensions.filters.http.router.v3.Router
+            suppressEnvoyHeaders: true
+        mergeSlashes: true
+        normalizePath: true
+        pathWithEscapedSlashesAction: UNESCAPE_AND_REDIRECT
+        rds:
+          configSource:
+            ads: {}
+            resourceApiVersion: V3
+          routeConfigName: listener-enable-req-resp-sizes-stats
+        serverHeaderTransformation: PASS_THROUGH
+        statPrefix: http-10080
+        useRemoteAddress: true
+    name: listener-enable-req-resp-sizes-stats
+  name: listener-enable-req-resp-sizes-stats
+  perConnectionBufferLimitBytes: 32768
diff --git a/internal/xds/translator/testdata/out/xds-ir/http-req-resp-sizes-stats.routes.yaml b/internal/xds/translator/testdata/out/xds-ir/http-req-resp-sizes-stats.routes.yaml
new file mode 100644
index 00000000000..63cbc847197
--- /dev/null
+++ b/internal/xds/translator/testdata/out/xds-ir/http-req-resp-sizes-stats.routes.yaml
@@ -0,0 +1,14 @@
+- ignorePortInHostMatching: true
+  name: listener-enable-req-resp-sizes-stats
+  virtualHosts:
+  - domains:
+    - '*'
+    name: listener-enable-req-resp-sizes-stats/*
+    routes:
+    - match:
+        prefix: /
+      name: first-route
+      route:
+        cluster: first-route-dest
+        upgradeConfigs:
+        - upgradeType: websocket
diff --git a/internal/xds/translator/testdata/out/xds-ir/tcp-req-resp-sizes-stats.clusters.yaml b/internal/xds/translator/testdata/out/xds-ir/tcp-req-resp-sizes-stats.clusters.yaml
new file mode 100644
index 00000000000..fe51488c706
--- /dev/null
+++ b/internal/xds/translator/testdata/out/xds-ir/tcp-req-resp-sizes-stats.clusters.yaml
@@ -0,0 +1 @@
+[]
diff --git a/internal/xds/translator/testdata/out/xds-ir/tcp-req-resp-sizes-stats.endpoints.yaml b/internal/xds/translator/testdata/out/xds-ir/tcp-req-resp-sizes-stats.endpoints.yaml
new file mode 100644
index 00000000000..fe51488c706
--- /dev/null
+++ b/internal/xds/translator/testdata/out/xds-ir/tcp-req-resp-sizes-stats.endpoints.yaml
@@ -0,0 +1 @@
+[]
diff --git a/internal/xds/translator/testdata/out/xds-ir/tcp-req-resp-sizes-stats.listeners.yaml b/internal/xds/translator/testdata/out/xds-ir/tcp-req-resp-sizes-stats.listeners.yaml
new file mode 100644
index 00000000000..994341e55ec
--- /dev/null
+++ b/internal/xds/translator/testdata/out/xds-ir/tcp-req-resp-sizes-stats.listeners.yaml
@@ -0,0 +1,6 @@
+- address:
+    socketAddress:
+      address: 0.0.0.0
+      portValue: 10080
+  name: tcp-route-enable-req-resp-sizes-stats
+  perConnectionBufferLimitBytes: 32768
diff --git a/internal/xds/translator/testdata/out/xds-ir/tcp-req-resp-sizes-stats.routes.yaml b/internal/xds/translator/testdata/out/xds-ir/tcp-req-resp-sizes-stats.routes.yaml
new file mode 100644
index 00000000000..fe51488c706
--- /dev/null
+++ b/internal/xds/translator/testdata/out/xds-ir/tcp-req-resp-sizes-stats.routes.yaml
@@ -0,0 +1 @@
+[]
diff --git a/internal/xds/translator/testdata/out/xds-ir/udp-req-resp-sizes-stats.clusters.yaml b/internal/xds/translator/testdata/out/xds-ir/udp-req-resp-sizes-stats.clusters.yaml
new file mode 100644
index 00000000000..f7c6a0bf095
--- /dev/null
+++ b/internal/xds/translator/testdata/out/xds-ir/udp-req-resp-sizes-stats.clusters.yaml
@@ -0,0 +1,19 @@
+- circuitBreakers:
+    thresholds:
+    - maxRetries: 1024
+  commonLbConfig:
+    localityWeightedLbConfig: {}
+  connectTimeout: 10s
+  dnsLookupFamily: V4_ONLY
+  edsClusterConfig:
+    edsConfig:
+      ads: {}
+      resourceApiVersion: V3
+    serviceName: udp-route-dest
+  lbPolicy: LEAST_REQUEST
+  name: udp-route-dest
+  outlierDetection: {}
+  perConnectionBufferLimitBytes: 32768
+  trackClusterStats:
+    requestResponseSizes: true
+  type: EDS
diff --git a/internal/xds/translator/testdata/out/xds-ir/udp-req-resp-sizes-stats.endpoints.yaml b/internal/xds/translator/testdata/out/xds-ir/udp-req-resp-sizes-stats.endpoints.yaml
new file mode 100644
index 00000000000..2e3c84e672c
--- /dev/null
+++ b/internal/xds/translator/testdata/out/xds-ir/udp-req-resp-sizes-stats.endpoints.yaml
@@ -0,0 +1,18 @@
+- clusterName: udp-route-dest
+  endpoints:
+  - lbEndpoints:
+    - endpoint:
+        address:
+          socketAddress:
+            address: 1.2.3.4
+            portValue: 50000
+      loadBalancingWeight: 1
+    - endpoint:
+        address:
+          socketAddress:
+            address: 5.6.7.8
+            portValue: 50001
+      loadBalancingWeight: 1
+    loadBalancingWeight: 1
+    locality:
+      region: udp-route-dest/backend/0
diff --git a/internal/xds/translator/testdata/out/xds-ir/udp-req-resp-sizes-stats.listeners.yaml b/internal/xds/translator/testdata/out/xds-ir/udp-req-resp-sizes-stats.listeners.yaml
new file mode 100644
index 00000000000..6bf13465916
--- /dev/null
+++ b/internal/xds/translator/testdata/out/xds-ir/udp-req-resp-sizes-stats.listeners.yaml
@@ -0,0 +1,18 @@
+- address:
+    socketAddress:
+      address: 0.0.0.0
+      portValue: 10080
+      protocol: UDP
+  listenerFilters:
+  - name: envoy.filters.udp_listener.udp_proxy
+    typedConfig:
+      '@type': type.googleapis.com/envoy.extensions.filters.udp.udp_proxy.v3.UdpProxyConfig
+      matcher:
+        onNoMatch:
+          action:
+            name: route
+            typedConfig:
+              '@type': type.googleapis.com/envoy.extensions.filters.udp.udp_proxy.v3.Route
+              cluster: udp-route-dest
+      statPrefix: service
+  name: udp-route-enable-req-resp-sizes-stats
diff --git a/internal/xds/translator/testdata/out/xds-ir/udp-req-resp-sizes-stats.routes.yaml b/internal/xds/translator/testdata/out/xds-ir/udp-req-resp-sizes-stats.routes.yaml
new file mode 100644
index 00000000000..fe51488c706
--- /dev/null
+++ b/internal/xds/translator/testdata/out/xds-ir/udp-req-resp-sizes-stats.routes.yaml
@@ -0,0 +1 @@
+[]