Add HTTP/2 ping options to DestinationRule

networking/v1alpha3/destination_rule.proto

@@ -695,6 +695,20 @@ message ConnectionPoolSettings {
     // The maximum number of concurrent streams allowed for a peer on one HTTP/2 connection.
     // Defaults to 2^31-1.
     int32 max_concurrent_streams = 8;
+
+    // Settings for HTTP/2 PING frames.
+    message ConnectionKeepalive {
+      // Send HTTP/2 PING frames at this interval. Required when
+      // `http2KeepAlive` is set.
+      google.protobuf.Duration interval = 1;
+
+      // How long to wait for a response to an HTTP/2 PING frame before
+      // closing the connection. Required when `http2KeepAlive` is set.
+      google.protobuf.Duration timeout = 2;
+    }
+
+    // Configure HTTP/2 PING frames for upstream connections.
+    ConnectionKeepalive http2_keep_alive = 9;
   }
 
   // Settings common to both HTTP and TCP upstream connections.

releasenotes/notes/destination-rule-http2-keepalive.yaml

@@ -0,0 +1,10 @@
+apiVersion: release-notes/v2
+kind: feature
+area: traffic-management
+issue:
+  - https://github.com/istio/istio/issues/55640
+
+releaseNotes:
+  - |
+    **Added** `http2KeepAlive` settings to the `DestinationRule` API to enable
+    configuring HTTP/2 keepalive pings for upstream connections.

tests/testdata/destinationrule-valid.yaml

@@ -32,4 +32,17 @@ spec:
       warmup:
         duration: 300s
         minimumPercent: 5.0
-        aggression: 5.0
+        aggression: 5.0
+---
+apiVersion: networking.istio.io/v1
+kind: DestinationRule
+metadata:
+  name: bookinfo-ratings-http2-ping
+spec:
+  host: ratings.prod.svc.cluster.local
+  trafficPolicy:
+    connectionPool:
+      http:
+        http2KeepAlive:
+          interval: 15s
+          timeout: 5s