Add Shutdown Delay Seconds to the containers (#4030)

test/sdk/go/Makefile

@@ -29,7 +29,7 @@ project_path := $(dir $(mkfile_path))
 root_path = $(realpath $(project_path)/)
 # Because go mod init in the Dockerfile installs the most recently released version of Agones, this
 # will need to be built and pushed post-release. During DEV it will be built at DEV - 1.
-release_version = 1.43.0
+release_version = 1.44.0
 server_tag := $(REGISTRY)/sdk-client-test:$(release_version)
 
 #   _____                    _

test/sdk/go/sdk-client-test.go

@@ -17,6 +17,7 @@ package main
 
 import (
 	"log"
+	"os"
 	"strconv"
 	"strings"
 	"time"
@@ -38,6 +39,24 @@ func main() {
 	runtime.Must(runtime.FeaturesBindEnv())
 	runtime.Must(runtime.ParseFeaturesFromEnv())
 
+	// Use to delays to prevent Game Servers from churning too quickly on a running cluster.
+	shutdownDelaySec := 0
+	gracefulTerminationDelaySec := 0
+	if sds := os.Getenv("SHUTDOWN_DELAY_SECONDS"); sds != "" {
+		sec, err := strconv.Atoi(sds)
+		if err != nil {
+			log.Fatalf("Could not parse SHUTDOWN_DELAY_SECONDS: %v", err)
+		}
+		shutdownDelaySec = sec
+	}
+	if gtds := os.Getenv("GRACEFUL_TERMINATION_DELAY_SECONDS"); gtds != "" {
+		sec, err := strconv.Atoi(gtds)
+		if err != nil {
+			log.Fatalf("Could not parse GRACEFUL_TERMINATION_DELAY_SECONDS: %v", err)
+		}
+		gracefulTerminationDelaySec = sec
+	}
+
 	log.SetFlags(log.Lshortfile)
 	log.Println("Client is starting")
 	log.Printf("Feature Flags: %s\n", runtime.EncodeFeatures())
@@ -105,13 +124,16 @@ func main() {
 		testLists(sdk)
 	}
 
-	// Delay before shutdown to prevent Game Servers from churning too quickly on a running cluster
-	time.Sleep(8 * time.Second)
+	log.Printf("Waiting %d seconds before shutting down game server", shutdownDelaySec)
+	time.Sleep(time.Duration(shutdownDelaySec) * time.Second)
 
 	err = sdk.Shutdown()
 	if err != nil {
 		log.Fatalf("Could not shutdown GameServer: %s", err)
 	}
+
+	log.Printf("Waiting %d seconds before exiting", gracefulTerminationDelaySec)
+	time.Sleep(time.Duration(gracefulTerminationDelaySec) * time.Second)
 }
 
 func testPlayerTracking(sdk *goSdk.SDK) {