module-project-validator/Editor/Validators/GameObject/GameObjectValidatorObsoleteComponents.cs

using System;
using System.Collections.Generic;
using System.Reflection;
using UnityEngine;
using UnityEngine.Pool;

namespace Module.ProjectValidator.Editor
{
    internal sealed class GameObjectValidatorObsoleteComponents : IGameObjectValidator
    {
        public void Validate(GameObject gameObject, List<ValidatorResult> results)
        {
            using var _ = ListPool<Component>.Get(out var list);
            gameObject.GetComponents(list);

            for (var i = 0; i < list.Count; i++)
            {
                var type = list[i].GetType();

                if (type.GetCustomAttribute(typeof(ObsoleteAttribute)) != null)
                    results.Add(ValidatorResult.Create(EValidatorSeverity.Warning, $"GameObject has obsolete '{type.Name}' component"));
            }
        }
    }
}