get deploy-retries from launchdarkly by default

Users can still set deploy-retries to whatever value they'd like, however.

internal/command/deploy/deploy.go

@@ -167,10 +167,10 @@ var CommonFlags = flag.Set{
 		Shorthand:   "s",
 		Description: "Signal to stop the machine with for bluegreen strategy (default: SIGINT)",
 	},
-	flag.Int{
+	flag.String{
 		Name:        "deploy-retries",
 		Description: "Number of times to retry a deployment if it fails",
-		Default:     0,
+		Default:     "auto",
 	},
 }
 
@@ -486,6 +486,28 @@ func deployToMachines(
 
 	status.FlyctlVersion = buildinfo.Info().Version.String()
 
+	retriesFlag := flag.GetString(ctx, "deploy-retries")
+	deployRetries := 0
+
+	switch retriesFlag {
+	case "auto":
+		ldClient := launchdarkly.ClientFromContext(ctx)
+		retries := ldClient.GetFeatureFlagValue("deploy-retries", 0.0).(float64)
+		deployRetries = int(retries)
+
+	default:
+		var invalidRetriesErr error = fmt.Errorf("--deploy-retries must be set to a positive integer, 0, or 'auto'")
+		retries, err := strconv.Atoi(retriesFlag)
+		if err != nil {
+			return invalidRetriesErr
+		}
+		if retries < 0 {
+			return invalidRetriesErr
+		}
+
+		deployRetries = retries
+	}
+
 	md, err := NewMachineDeployment(ctx, MachineDeploymentArgs{
 		AppCompact:            app,
 		DeploymentImage:       img.Tag,
@@ -513,7 +535,7 @@ func deployToMachines(
 		MaxConcurrent:         maxConcurrent,
 		VolumeInitialSize:     flag.GetInt(ctx, "volume-initial-size"),
 		ProcessGroups:         processGroups,
-		DeployRetries:         flag.GetInt(ctx, "deploy-retries"),
+		DeployRetries:         deployRetries,
 	})
 	if err != nil {
 		sentry.CaptureExceptionWithAppInfo(ctx, err, "deploy", app)

internal/launchdarkly/launchdarkly.go

@@ -13,6 +13,7 @@ import (
 	"github.com/launchdarkly/go-sdk-common/v3/ldcontext"
 	"github.com/superfly/flyctl/internal/logger"
 	"github.com/superfly/flyctl/internal/tracing"
+	"go.opentelemetry.io/otel/attribute"
 )
 
 const clientSideID string = "6557a71bbffb5f134b84b15c"
@@ -84,12 +85,18 @@ func (ldClient *Client) monitor(ctx context.Context) {
 }
 
 func (ldClient *Client) GetFeatureFlagValue(key string, defaultValue any) any {
+	_, span := tracing.GetTracer().Start(context.Background(), "get_feature_flag_value")
+	defer span.End()
+
+	span.SetAttributes(attribute.String("flag", key))
+
 	ldClient.flagsMutex.Lock()
 	defer ldClient.flagsMutex.Unlock()
 
 	if flag, ok := ldClient.flags[key]; ok {
 		return flag.Value
 	}
+	span.SetAttributes(attribute.Bool("default_flag", true))
 	return defaultValue
 
 }