fix: make it go1.21 and linter compatible

go.sum

@@ -483,6 +483,8 @@ golang.org/x/exp v0.0.0-20191227195350-da58074b4299/go.mod h1:2RIsYlXP63K8oxa1u0
 golang.org/x/exp v0.0.0-20200119233911-0405dc783f0a/go.mod h1:2RIsYlXP63K8oxa1u096TMicItID8zy7Y6sNkU49FU4=
 golang.org/x/exp v0.0.0-20200207192155-f17229e696bd/go.mod h1:J/WKrq2StrnmMY6+EHIKF9dgMWnmCNThgcyBT1FY9mM=
 golang.org/x/exp v0.0.0-20200224162631-6cc2880d07d6/go.mod h1:3jZMyOhIsHpP37uCMkUooju7aAi5cS1Q23tOzKc+0MU=
+golang.org/x/exp v0.0.0-20220722155223-a9213eeb770e h1:+WEEuIdZHnUeJJmEUjyYC2gfUMj69yZXw17EnHg/otA=
+golang.org/x/exp v0.0.0-20220722155223-a9213eeb770e/go.mod h1:Kr81I6Kryrl9sr8s2FK3vxD90NdsKWRuOIl2O4CvYbA=
 golang.org/x/image v0.0.0-20190227222117-0694c2d4d067/go.mod h1:kZ7UVZpmo3dzQBMxlp+ypCbDeSB+sBbTgSJuh5dn5js=
 golang.org/x/image v0.0.0-20190802002840-cff245a6509b/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
 golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=

pkg/sdkserver/localsdk_test.go

@@ -327,7 +327,7 @@ func TestLocalSDKServerSetAnnotations(t *testing.T) {
 			assertInitialWatchUpdate(t, stream)
 
 			// make sure length of l.updateObservers is at least 1
-			err = wait.PollImmediate(time.Second, 10*time.Second, func() (bool, error) {
+			err = wait.PollUntilContextTimeout(context.Background(), time.Second, 10*time.Second, true, func(ctx context.Context) (bool, error) {
 				ret := false
 				l.updateObservers.Range(func(_, _ interface{}) bool {
 					ret = true

sdks/go/sdk.go

@@ -20,12 +20,13 @@ import (
 	"fmt"
 	"io"
 	"os"
+	"sort"
 	"time"
 
 	"github.com/pkg/errors"
-	"google.golang.org/grpc/credentials/insecure"
-
+	"golang.org/x/exp/maps"
 	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials/insecure"
 
 	"agones.dev/agones/pkg/sdk"
 )
@@ -139,6 +140,19 @@ func (s *SDK) SetAnnotation(key, value string) error {
 	return errors.Wrap(err, "could not set annotation")
 }
 
+// SetAnnotations sets a metadata annotation on the `GameServer` with the prefix "agones.dev/sdk-".
+func (s *SDK) SetAnnotations(keyVals map[string]string) error {
+	keys := maps.Keys(keyVals)
+	sort.Strings(keys)
+
+	kvs := make([]*sdk.KeyValue, 0, len(keyVals))
+	for _, key := range keys {
+		kvs = append(kvs, &sdk.KeyValue{Key: key, Value: keyVals[key]})
+	}
+	_, err := s.client.SetAnnotations(s.ctx, &sdk.KeyValues{KeyValues: kvs})
+	return errors.Wrap(err, "could not set annotations")
+}
+
 // GameServer retrieve the GameServer details.
 func (s *SDK) GameServer() (*sdk.GameServer, error) {
 	gs, err := s.client.GetGameServer(s.ctx, &sdk.Empty{})