Add a log level config option

conf/config.example.toml

@@ -2,6 +2,7 @@
 # as the intrinsic default value.
 
 log-format = "text"
+log-level = "info"
 
 [server]
 # Use "-" to disable the handler.

src/config.go

@@ -38,6 +38,7 @@ type Config struct {
 	Insecure      bool                `toml:"-" env:"insecure"`
 	Features      []string            `toml:"features"`
 	LogFormat     string              `toml:"log-format" default:"text"`
+	LogLevel      string              `toml:"log-level" default:"info"`
 	Server        ServerConfig        `toml:"server"`
 	Wildcard      []WildcardConfig    `toml:"wildcard"`
 	Storage       StorageConfig       `toml:"storage"`

src/observe.go

@@ -12,6 +12,7 @@ import (
 	"os"
 	"runtime/debug"
 	"strconv"
+	"strings"
 	"time"
 
 	slogmulti "github.com/samber/slog-multi"
@@ -55,15 +56,29 @@ func InitObservability() {
 
 	logHandlers := []slog.Handler{}
 
+	logLevel := slog.LevelInfo
+	switch strings.ToLower(config.LogLevel) {
+	case "debug":
+		logLevel = slog.LevelDebug
+	case "info":
+		logLevel = slog.LevelInfo
+	case "warn":
+		logLevel = slog.LevelWarn
+	case "error":
+		logLevel = slog.LevelError
+	default:
+		log.Println("unknown log level", config.LogLevel)
+	}
+
 	switch config.LogFormat {
 	case "none":
 		// nothing to do
 	case "text":
 		logHandlers = append(logHandlers,
-			slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{}))
+			slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{Level: logLevel}))
 	case "json":
 		logHandlers = append(logHandlers,
-			slog.NewJSONHandler(os.Stderr, &slog.HandlerOptions{}))
+			slog.NewJSONHandler(os.Stderr, &slog.HandlerOptions{Level: logLevel}))
 	default:
 		log.Println("unknown log format", config.LogFormat)
 	}
@@ -118,6 +133,7 @@ func InitObservability() {
 		if enableLogs {
 			logHandlers = append(logHandlers, sentryslog.Option{
 				AddSource: true,
+				LogLevel:  levelsFromMinimum(logLevel),
 			}.NewSentryHandler(context.Background()))
 		}
 	}
@@ -125,6 +141,18 @@ func InitObservability() {
 	slog.SetDefault(slog.New(slogmulti.Fanout(logHandlers...)))
 }
 
+// From sentryslog, because for some reason they don't make it public.
+func levelsFromMinimum(minLevel slog.Level) []slog.Level {
+	allLevels := []slog.Level{slog.LevelDebug, slog.LevelInfo, slog.LevelWarn, slog.LevelError, sentryslog.LevelFatal}
+	var result []slog.Level
+	for _, level := range allLevels {
+		if level >= minLevel {
+			result = append(result, level)
+		}
+	}
+	return result
+}
+
 func FiniObservability() {
 	if hasSentry() {
 		sentry.Flush(2 * time.Second)