diff --git a/flaps/flaps_machines.go b/flaps/flaps_machines.go
index 1f9aa3f..87b1f69 100644
--- a/flaps/flaps_machines.go
+++ b/flaps/flaps_machines.go
@@ -21,15 +21,6 @@ func (f *Client) sendRequestMachines(ctx context.Context, method, endpoint strin
 }
 
 func (f *Client) Launch(ctx context.Context, builder fly.LaunchMachineInput) (out *fly.Machine, err error) {
-	//metrics.Started(ctx, "machine_launch")
-	//sendUpdateMetrics := metrics.StartTiming(ctx, "machine_launch/duration")
-	//defer func() {
-	//	metrics.Status(ctx, "machine_launch", err == nil)
-	//	if err == nil {
-	//		sendUpdateMetrics()
-	//	}
-	//}()
-
 	ctx = contextWithAction(ctx, machineLaunch)
 
 	out = new(fly.Machine)
@@ -46,15 +37,6 @@ func (f *Client) Update(ctx context.Context, builder fly.LaunchMachineInput, non
 		headers[NonceHeader] = []string{nonce}
 	}
 
-	//metrics.Started(ctx, "machine_update")
-	//sendUpdateMetrics := metrics.StartTiming(ctx, "machine_update/duration")
-	//defer func() {
-	//	metrics.Status(ctx, "machine_update", err == nil)
-	//	if err == nil {
-	//		sendUpdateMetrics()
-	//	}
-	//}()
-
 	ctx = contextWithAction(ctx, machineUpdate)
 	ctx = contextWithMachineID(ctx, builder.ID)
 
@@ -76,11 +58,6 @@ func (f *Client) Start(ctx context.Context, machineID string, nonce string) (out
 
 	out = new(fly.MachineStartResponse)
 
-	//metrics.Started(ctx, "machine_start")
-	//defer func() {
-	//	metrics.Status(ctx, "machine_start", err == nil)
-	//}()
-
 	ctx = contextWithAction(ctx, machineStart)
 	ctx = contextWithMachineID(ctx, machineID)
 
@@ -402,14 +379,6 @@ func (f *Client) GetProcesses(ctx context.Context, machineID string) (fly.Machin
 }
 
 func (f *Client) Cordon(ctx context.Context, machineID string, nonce string) (err error) {
-	//metrics.Started(ctx, "machine_cordon")
-	//sendUpdateMetrics := metrics.StartTiming(ctx, "machine_cordon/duration")
-	//defer func() {
-	//	metrics.Status(ctx, "machine_cordon", err == nil)
-	//	if err == nil {
-	//		sendUpdateMetrics()
-	//	}
-	//}()
 	headers := make(map[string][]string)
 	if nonce != "" {
 		headers[NonceHeader] = []string{nonce}
@@ -426,14 +395,6 @@ func (f *Client) Cordon(ctx context.Context, machineID string, nonce string) (er
 }
 
 func (f *Client) Uncordon(ctx context.Context, machineID string, nonce string) (err error) {
-	//metrics.Started(ctx, "machine_uncordon")
-	//sendUpdateMetrics := metrics.StartTiming(ctx, "machine_uncordon/duration")
-	//defer func() {
-	//	metrics.Status(ctx, "machine_uncordon", err == nil)
-	//	if err == nil {
-	//		sendUpdateMetrics()
-	//	}
-	//}()
 	headers := make(map[string][]string)
 	if nonce != "" {
 		headers[NonceHeader] = []string{nonce}
diff --git a/fly.go b/fly.go
new file mode 100644
index 0000000..167d718
--- /dev/null
+++ b/fly.go
@@ -0,0 +1,22 @@
+package fly
+
+import "slices"
+
+// MergeFiles merges the files parsed from the command line or fly.toml into the machine configuration.
+func MergeFiles(machineConf *MachineConfig, files []*File) {
+	for _, f := range files {
+		idx := slices.IndexFunc(machineConf.Files, func(i *File) bool {
+			return i.GuestPath == f.GuestPath
+		})
+
+		switch {
+		case idx == -1:
+			machineConf.Files = append(machineConf.Files, f)
+			continue
+		case f.RawValue == nil && f.SecretName == nil:
+			machineConf.Files = slices.Delete(machineConf.Files, idx, idx+1)
+		default:
+			machineConf.Files = slices.Replace(machineConf.Files, idx, idx+1, f)
+		}
+	}
+}