Logger: Add feature toggle for errors in HTTP request logs (#64425)

pkg/util/errutil/log.go

@@ -1,5 +1,7 @@
 package errutil
 
+import "context"
+
 type LogLevel string
 
 const (
@@ -35,3 +37,36 @@ func (l LogLevel) LogFunc(logger LogInterface) func(msg string, ctx ...interface
 		return logger.Error
 	}
 }
+
+func (l LogLevel) HighestOf(other LogLevel) LogLevel {
+	if l.order() < other.order() {
+		return other
+	}
+	return l
+}
+
+func (l LogLevel) order() int {
+	switch l {
+	case LevelNever:
+		return 0
+	case LevelDebug:
+		return 1
+	case LevelInfo:
+		return 2
+	case LevelWarn:
+		return 3
+	default: // LevelUnknown and LevelError.
+		return 4
+	}
+}
+
+type useUnifiedLogging struct{}
+
+func SetUnifiedLogging(ctx context.Context) context.Context {
+	return context.WithValue(ctx, useUnifiedLogging{}, true)
+}
+
+func HasUnifiedLogging(ctx context.Context) bool {
+	v, ok := ctx.Value(useUnifiedLogging{}).(bool)
+	return ok && v
+}