fix sleep time default, add debug flag

cmd/config.go

@@ -23,6 +23,7 @@ Options:
 -s --sleeptime <int>          Time to sleep between checks (default: 5s)
 -l --label     <label=value>  Add label to exported metric
 -i --internals                Also add labels about resource usage
+-d --debug                    Enable debug log level
 -h --help                     Show help
 -v --version                  Show program version`
 )
@@ -32,10 +33,11 @@ type Config struct {
 	Showversion bool     `koanf:"version"`   // -v
 	Showhelp    bool     `koanf:"help"`      // -h
 	Internals   bool     `koanf:"internals"` // -i
+	Debug       bool     `koanf:"debug"`     // -d
 	Label       []string `koanf:"label"`     // -v
 	Timeout     int      `koanf:"timeout"`   // -t
 	Port        int      `koanf:"port"`      // -p
-	Sleeptime   int      `koanf:"sleep"`     // -s
+	Sleeptime   int      `koanf:"sleeptime"` // -s
 
 	File   string
 	Labels []Label
@@ -56,6 +58,7 @@ func InitConfig(output io.Writer) (*Config, error) {
 	// parse commandline flags
 	flagset.BoolP("version", "v", false, "show program version")
 	flagset.BoolP("help", "h", false, "show help")
+	flagset.BoolP("debug", "d", false, "enable debug logs")
 	flagset.BoolP("internals", "i", false, "add internal metrics")
 	flagset.StringArrayP("label", "l", nil, "additional labels")
 	flagset.IntP("timeout", "t", 1, "timeout for file operation in seconds")

cmd/log.go

@@ -7,14 +7,18 @@ import (
 	"github.com/lmittmann/tint"
 )
 
-func setLogger(output io.Writer) {
+func setLogger(output io.Writer, debug bool) {
 	logLevel := &slog.LevelVar{}
 	opts := &tint.Options{
 		Level:     logLevel,
 		AddSource: false,
 	}
 
+	if debug {
 		logLevel.Set(slog.LevelDebug)
+	} else {
+		logLevel.Set(slog.LevelInfo)
+	}
 
 	handler := tint.NewHandler(output, opts)
 	logger := slog.New(handler)

cmd/root.go

@@ -21,7 +21,7 @@ func Run() {
 	metrics := NewMetrics(conf)
 	alloc := NewAlloc()
 
-	setLogger(os.Stdout)
+	setLogger(os.Stdout, conf.Debug)
 
 	go func() {
 		for {
@@ -32,6 +32,7 @@ func Run() {
 			// ns => s
 			now := time.Now()
 			elapsed := float64(now.Sub(start).Nanoseconds()) / 10000000000
+			slog.Debug("elapsed time", "elapsed", elapsed, "result", result)
 
 			metrics.Set(result, elapsed)