refactor: small comment / structure updates

agent/gpu_nvml.go

@@ -2,13 +2,13 @@ package agent
 
 import (
 	"fmt"
+	"log/slog"
 	"strings"
 	"time"
 	"unsafe"
 
 	"github.com/ebitengine/purego"
 	"github.com/henrygd/beszel/internal/entities/system"
-	"log/slog"
 )
 
 // NVML constants and types
@@ -180,7 +180,7 @@ func (c *nvmlCollector) collect() {
 		var temp uint32
 		nvmlDeviceGetTemperature(device, 0, &temp) // 0 is NVML_TEMPERATURE_GPU
 
-		// only poll memory if GPU is active to avoid resetting 21 second suspend timer
+		// Memory: only poll if GPU is active to avoid leaving D3cold state (#1522)
 		if utilization.Gpu > 0 {
 			var usedMem, totalMem uint64
 			if c.isV2 {

agent/systemd.go

@@ -20,24 +20,6 @@ import (
 
 var errNoActiveTime = errors.New("no active time")
 
-// isSystemdAvailable checks if systemd is running as the init system (PID 1).
-// This prevents unnecessary connection attempts on systems using other init systems
-// like OpenRC, runit, or when running in containers without systemd.
-func isSystemdAvailable() bool {
-	// Check if /run/systemd/system directory exists - this is a reliable indicator
-	// that systemd is running as the init system
-	if _, err := os.Stat("/run/systemd/system"); err == nil {
-		return true
-	}
-
-	// Fallback: check if PID 1 is systemd by reading /proc/1/comm
-	if data, err := os.ReadFile("/proc/1/comm"); err == nil {
-		return strings.TrimSpace(string(data)) == "systemd"
-	}
-
-	return false
-}
-
 // systemdManager manages the collection of systemd service statistics.
 type systemdManager struct {
 	sync.Mutex
@@ -47,6 +29,17 @@ type systemdManager struct {
 	patterns        []string
 }
 
+// isSystemdAvailable checks if systemd is used on the system to avoid unnecessary connection attempts.
+func isSystemdAvailable() bool {
+	if _, err := os.Stat("/run/systemd/system"); err == nil {
+		return true
+	}
+	if data, err := os.ReadFile("/proc/1/comm"); err == nil {
+		return strings.TrimSpace(string(data)) == "systemd"
+	}
+	return false
+}
+
 // newSystemdManager creates a new systemdManager.
 func newSystemdManager() (*systemdManager, error) {
 	if skipSystemd, _ := GetEnv("SKIP_SYSTEMD"); skipSystemd == "true" {