Support setting sticky cookie max age

pkg/server/service/loadbalancer/wrr/wrr.go

@@ -25,6 +25,7 @@ type stickyCookie struct {
 	secure   bool
 	httpOnly bool
 	sameSite string
+	maxAge   int
 }
 
 func convertSameSite(sameSite string) http.SameSite {
@@ -77,6 +78,7 @@ func New(sticky *dynamic.Sticky, wantHealthCheck bool) *Balancer {
 			secure:   sticky.Cookie.Secure,
 			httpOnly: sticky.Cookie.HTTPOnly,
 			sameSite: sticky.Cookie.SameSite,
+			maxAge:   sticky.Cookie.MaxAge,
 		}
 	}
 
@@ -238,6 +240,7 @@ func (b *Balancer) ServeHTTP(w http.ResponseWriter, req *http.Request) {
 			HttpOnly: b.stickyCookie.httpOnly,
 			Secure:   b.stickyCookie.secure,
 			SameSite: convertSameSite(b.stickyCookie.sameSite),
+			MaxAge:   b.stickyCookie.maxAge,
 		}
 		http.SetCookie(w, cookie)
 	}

pkg/server/service/loadbalancer/wrr/wrr_test.go

@@ -225,6 +225,7 @@ func TestSticky(t *testing.T) {
 			Secure:   true,
 			HTTPOnly: true,
 			SameSite: "none",
+			MaxAge:   42,
 		},
 	}, false)
 
@@ -261,6 +262,7 @@ func TestSticky(t *testing.T) {
 	assert.True(t, recorder.cookies["test"].HttpOnly)
 	assert.True(t, recorder.cookies["test"].Secure)
 	assert.Equal(t, http.SameSiteNoneMode, recorder.cookies["test"].SameSite)
+	assert.Equal(t, 42, recorder.cookies["test"].MaxAge)
 }
 
 func TestSticky_FallBack(t *testing.T) {