feat: heath checks, seq e logs

src/BCards.IntegrationTests/Helpers/AuthenticationHelper.cs

@@ -12,7 +12,7 @@ namespace BCards.IntegrationTests.Helpers;
 
 public static class AuthenticationHelper
 {
-    public static async Task<HttpClient> CreateAuthenticatedClientAsync(
+    public static Task<HttpClient> CreateAuthenticatedClientAsync(
         WebApplicationFactory<Program> factory, 
         User testUser)
     {
@@ -34,7 +34,7 @@ public static class AuthenticationHelper
         client.DefaultRequestHeaders.Add("TestUserEmail", testUser.Email);
         client.DefaultRequestHeaders.Add("TestUserName", testUser.Name);
 
-        return client;
+        return Task.FromResult(client);
     }
 
     public static ClaimsPrincipal CreateTestClaimsPrincipal(User user)

src/BCards.IntegrationTests/Helpers/PuppeteerTestHelper.cs

@@ -161,9 +161,9 @@ public class PuppeteerTestHelper : IAsyncDisposable
         await Page.ScreenshotAsync(fileName);
     }
 
-    public async Task<string> GetCurrentUrlAsync()
+    public Task<string> GetCurrentUrlAsync()
     {
-        return Page.Url;
+        return Task.FromResult(Page.Url);
     }
 
     public async Task<List<string>> GetAllElementTextsAsync(string selector)

src/BCards.Web/BCards.Web.csproj

@@ -20,6 +20,15 @@
     <PackageReference Include="Microsoft.AspNetCore.ResponseCaching" Version="2.2.0" />
     <PackageReference Include="HtmlAgilityPack" Version="1.11.54" />
     <PackageReference Include="SendGrid" Version="9.29.3" />
+    <PackageReference Include="Serilog.AspNetCore" Version="8.0.0" />
+    <PackageReference Include="Serilog.Sinks.Console" Version="5.0.0" />
+    <PackageReference Include="Serilog.Sinks.Seq" Version="6.0.0" />
+    <PackageReference Include="Serilog.Enrichers.Environment" Version="3.0.0" />
+    <PackageReference Include="Serilog.Enrichers.Process" Version="3.0.0" />
+    <PackageReference Include="Serilog.Enrichers.Thread" Version="4.0.0" />
+    <PackageReference Include="Serilog.Sinks.Async" Version="1.5.0" />
+    <PackageReference Include="Microsoft.Extensions.Diagnostics.HealthChecks" Version="8.0.0" />
+    <PackageReference Include="AspNetCore.HealthChecks.MongoDb" Version="7.0.0" />
   </ItemGroup>
 
   <ItemGroup>

src/BCards.Web/Controllers/AdminController.cs

@@ -6,6 +6,7 @@ using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.AspNetCore.Mvc.ModelBinding;
 using System.Security.Claims;
+using System.Text.Json;
 
 namespace BCards.Web.Controllers;
 
@@ -197,6 +198,11 @@ public class AdminController : Controller
         ModelState.Remove<ManagePageViewModel>(x => x.TwitterUrl);
         ModelState.Remove<ManagePageViewModel>(x => x.WhatsAppNumber);
 
+        _logger.LogInformation($"ManagePage POST: IsNewPage={model.IsNewPage}, DisplayName={model.DisplayName}, Category={model.Category}, Links={model.Links?.Count ?? 0}");
+
+        //Logar modelstate em information
+        _logger.LogInformation($"ModelState: {JsonSerializer.Serialize(ModelState)}");
+
         // Processar upload de imagem se fornecida
         if (model.ProfileImageFile != null && model.ProfileImageFile.Length > 0)
         {

src/BCards.Web/Controllers/HealthController.cs

@@ -0,0 +1,278 @@
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.Extensions.Diagnostics.HealthChecks;
+using System.Diagnostics;
+using System.Text.Json;
+
+namespace BCards.Web.Controllers;
+
+[ApiController]
+[Route("health")]
+public class HealthController : ControllerBase
+{
+    private readonly HealthCheckService _healthCheckService;
+    private readonly ILogger<HealthController> _logger;
+    private readonly IConfiguration _configuration;
+    private static readonly DateTime _startTime = DateTime.UtcNow;
+
+    public HealthController(HealthCheckService healthCheckService, ILogger<HealthController> logger, IConfiguration configuration)
+    {
+        _healthCheckService = healthCheckService;
+        _logger = logger;
+        _configuration = configuration;
+    }
+
+    /// <summary>
+    /// Health check simples - retorna apenas status geral
+    /// </summary>
+    [HttpGet]
+    public async Task<IActionResult> GetHealth()
+    {
+        var stopwatch = Stopwatch.StartNew();
+        
+        try
+        {
+            var healthReport = await _healthCheckService.CheckHealthAsync();
+            stopwatch.Stop();
+
+            var response = new
+            {
+                status = healthReport.Status.ToString().ToLower(),
+                timestamp = DateTime.UtcNow,
+                duration = $"{stopwatch.ElapsedMilliseconds}ms"
+            };
+
+            _logger.LogInformation("Simple health check completed: {Status} in {Duration}ms", 
+                                 response.status, stopwatch.ElapsedMilliseconds);
+
+            return healthReport.Status == HealthStatus.Healthy 
+                ? Ok(response) 
+                : StatusCode(503, response);
+        }
+        catch (Exception ex)
+        {
+            stopwatch.Stop();
+            _logger.LogError(ex, "Health check failed after {Duration}ms", stopwatch.ElapsedMilliseconds);
+            
+            return StatusCode(503, new
+            {
+                status = "unhealthy",
+                timestamp = DateTime.UtcNow,
+                duration = $"{stopwatch.ElapsedMilliseconds}ms",
+                error = ex.Message
+            });
+        }
+    }
+
+    /// <summary>
+    /// Health check detalhado - formato completo com métricas
+    /// </summary>
+    [HttpGet("detailed")]
+    public async Task<IActionResult> GetDetailedHealth()
+    {
+        var stopwatch = Stopwatch.StartNew();
+        
+        try
+        {
+            var healthReport = await _healthCheckService.CheckHealthAsync();
+            stopwatch.Stop();
+
+            var checks = new Dictionary<string, object>();
+            
+            foreach (var entry in healthReport.Entries)
+            {
+                checks[entry.Key] = new
+                {
+                    status = entry.Value.Status.ToString().ToLower(),
+                    duration = entry.Value.Duration.TotalMilliseconds + "ms",
+                    description = entry.Value.Description,
+                    data = entry.Value.Data,
+                    exception = entry.Value.Exception?.Message
+                };
+            }
+
+            var uptime = DateTime.UtcNow - _startTime;
+            
+            var response = new
+            {
+                applicationName = _configuration["ApplicationName"] ?? "BCards",
+                status = healthReport.Status.ToString().ToLower(),
+                timestamp = DateTime.UtcNow,
+                uptime = FormatUptime(uptime),
+                totalDuration = $"{stopwatch.ElapsedMilliseconds}ms",
+                checks = checks,
+                version = "1.0.0",
+                environment = Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT") ?? "Production"
+            };
+
+            _logger.LogInformation("Detailed health check completed: {Status} in {Duration}ms - {HealthyCount}/{TotalCount} services healthy",
+                                 response.status, stopwatch.ElapsedMilliseconds, 
+                                 healthReport.Entries.Count(e => e.Value.Status == HealthStatus.Healthy),
+                                 healthReport.Entries.Count);
+
+            return healthReport.Status == HealthStatus.Unhealthy 
+                ? StatusCode(503, response) 
+                : Ok(response);
+        }
+        catch (Exception ex)
+        {
+            stopwatch.Stop();
+            _logger.LogError(ex, "Detailed health check failed after {Duration}ms", stopwatch.ElapsedMilliseconds);
+            
+            return StatusCode(503, new
+            {
+                applicationName = "BCards",
+                status = "unhealthy",
+                timestamp = DateTime.UtcNow,
+                uptime = FormatUptime(DateTime.UtcNow - _startTime),
+                totalDuration = $"{stopwatch.ElapsedMilliseconds}ms",
+                error = ex.Message,
+                version = "1.0.0",
+                environment = Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT") ?? "Production"
+            });
+        }
+    }
+
+    /// <summary>
+    /// Health check para Uptime Kuma - formato específico
+    /// </summary>
+    [HttpGet("uptime-kuma")]
+    public async Task<IActionResult> GetUptimeKumaHealth()
+    {
+        var stopwatch = Stopwatch.StartNew();
+        
+        try
+        {
+            var healthReport = await _healthCheckService.CheckHealthAsync();
+            stopwatch.Stop();
+
+            var isHealthy = healthReport.Status == HealthStatus.Healthy;
+            var response = new
+            {
+                status = isHealthy ? "up" : "down",
+                message = isHealthy ? "All services operational" : $"Issues detected: {healthReport.Status}",
+                timestamp = DateTime.UtcNow.ToString("O"),
+                responseTime = stopwatch.ElapsedMilliseconds,
+                services = healthReport.Entries.ToDictionary(
+                    e => e.Key,
+                    e => new { 
+                        status = e.Value.Status.ToString().ToLower(),
+                        responseTime = e.Value.Duration.TotalMilliseconds
+                    }
+                )
+            };
+
+            _logger.LogInformation("Uptime Kuma health check: {Status} in {Duration}ms", 
+                                 response.status, stopwatch.ElapsedMilliseconds);
+
+            return Ok(response);
+        }
+        catch (Exception ex)
+        {
+            stopwatch.Stop();
+            _logger.LogError(ex, "Uptime Kuma health check failed after {Duration}ms", stopwatch.ElapsedMilliseconds);
+            
+            return Ok(new
+            {
+                status = "down",
+                message = $"Health check failed: {ex.Message}",
+                timestamp = DateTime.UtcNow.ToString("O"),
+                responseTime = stopwatch.ElapsedMilliseconds
+            });
+        }
+    }
+
+    /// <summary>
+    /// Health checks específicos por serviço
+    /// </summary>
+    [HttpGet("mongodb")]
+    public async Task<IActionResult> GetMongoDbHealth()
+    {
+        return await GetSpecificServiceHealth("mongodb");
+    }
+
+    [HttpGet("stripe")]
+    public async Task<IActionResult> GetStripeHealth()
+    {
+        return await GetSpecificServiceHealth("stripe");
+    }
+
+    [HttpGet("sendgrid")]
+    public async Task<IActionResult> GetSendGridHealth()
+    {
+        return await GetSpecificServiceHealth("sendgrid");
+    }
+
+    [HttpGet("external")]
+    public async Task<IActionResult> GetExternalServicesHealth()
+    {
+        return await GetSpecificServiceHealth("external_services");
+    }
+
+    [HttpGet("resources")]
+    public async Task<IActionResult> GetSystemResourcesHealth()
+    {
+        return await GetSpecificServiceHealth("resources");
+    }
+
+    private async Task<IActionResult> GetSpecificServiceHealth(string serviceName)
+    {
+        var stopwatch = Stopwatch.StartNew();
+        
+        try
+        {
+            var healthReport = await _healthCheckService.CheckHealthAsync(check => check.Name == serviceName);
+            stopwatch.Stop();
+
+            if (!healthReport.Entries.Any())
+            {
+                return NotFound(new { error = $"Service '{serviceName}' not found" });
+            }
+
+            var entry = healthReport.Entries.First().Value;
+            
+            var response = new
+            {
+                service = serviceName,
+                status = entry.Status.ToString().ToLower(),
+                timestamp = DateTime.UtcNow,
+                duration = $"{entry.Duration.TotalMilliseconds}ms",
+                description = entry.Description,
+                data = entry.Data,
+                exception = entry.Exception?.Message
+            };
+
+            _logger.LogInformation("Service {ServiceName} health check: {Status} in {Duration}ms", 
+                                 serviceName, response.status, entry.Duration.TotalMilliseconds);
+
+            return entry.Status == HealthStatus.Unhealthy 
+                ? StatusCode(503, response) 
+                : Ok(response);
+        }
+        catch (Exception ex)
+        {
+            stopwatch.Stop();
+            _logger.LogError(ex, "Service {ServiceName} health check failed after {Duration}ms", 
+                           serviceName, stopwatch.ElapsedMilliseconds);
+            
+            return StatusCode(503, new
+            {
+                service = serviceName,
+                status = "unhealthy",
+                timestamp = DateTime.UtcNow,
+                duration = $"{stopwatch.ElapsedMilliseconds}ms",
+                error = ex.Message
+            });
+        }
+    }
+
+    private static string FormatUptime(TimeSpan uptime)
+    {
+        if (uptime.TotalDays >= 1)
+            return $"{(int)uptime.TotalDays}d {uptime.Hours}h {uptime.Minutes}m";
+        if (uptime.TotalHours >= 1)
+            return $"{uptime.Hours}h {uptime.Minutes}m";
+        if (uptime.TotalMinutes >= 1)
+            return $"{uptime.Minutes}m {uptime.Seconds}s";
+        return $"{uptime.Seconds}s";
+    }
+}

src/BCards.Web/Controllers/UserPageController.cs

@@ -5,7 +5,6 @@ using Microsoft.AspNetCore.Mvc;
 
 namespace BCards.Web.Controllers;
 
-//[Route("[controller]")]
 public class UserPageController : Controller
 {
     private readonly IUserPageService _userPageService;
@@ -28,9 +27,6 @@ public class UserPageController : Controller
         _moderationService = moderationService;
     }
 
-    //[Route("{category}/{slug}")]
-    //VOltar a linha abaixo em prod
-    //[ResponseCache(Duration = 300, VaryByQueryKeys = new[] { "category", "slug" })]
     public async Task<IActionResult> Display(string category, string slug)
     {
         var userPage = await _userPageService.GetPageAsync(category, slug);

src/BCards.Web/HealthChecks/ExternalServicesHealthCheck.cs

@@ -0,0 +1,125 @@
+using Microsoft.Extensions.Diagnostics.HealthChecks;
+using System.Diagnostics;
+
+namespace BCards.Web.HealthChecks;
+
+public class ExternalServicesHealthCheck : IHealthCheck
+{
+    private readonly HttpClient _httpClient;
+    private readonly ILogger<ExternalServicesHealthCheck> _logger;
+
+    public ExternalServicesHealthCheck(HttpClient httpClient, ILogger<ExternalServicesHealthCheck> logger)
+    {
+        _httpClient = httpClient;
+        _logger = logger;
+    }
+
+    public async Task<HealthCheckResult> CheckHealthAsync(
+        HealthCheckContext context,
+        CancellationToken cancellationToken = default)
+    {
+        var stopwatch = Stopwatch.StartNew();
+        var results = new Dictionary<string, object>();
+        var allHealthy = true;
+        var hasUnhealthy = false;
+
+        try
+        {
+            // Lista de serviços externos para verificar
+            var services = new Dictionary<string, string>
+            {
+                { "google_oauth", "https://accounts.google.com/.well-known/openid_configuration" },
+                { "microsoft_oauth", "https://login.microsoftonline.com/common/v2.0/.well-known/openid_configuration" }
+            };
+
+            foreach (var service in services)
+            {
+                var serviceStopwatch = Stopwatch.StartNew();
+                try
+                {
+                    using var response = await _httpClient.GetAsync(service.Value, cancellationToken);
+                    serviceStopwatch.Stop();
+                    
+                    var serviceResult = new Dictionary<string, object>
+                    {
+                        { "status", response.IsSuccessStatusCode ? "healthy" : "unhealthy" },
+                        { "duration", $"{serviceStopwatch.ElapsedMilliseconds}ms" },
+                        { "status_code", (int)response.StatusCode },
+                        { "url", service.Value }
+                    };
+
+                    results[service.Key] = serviceResult;
+
+                    if (!response.IsSuccessStatusCode)
+                    {
+                        allHealthy = false;
+                        if (response.StatusCode == System.Net.HttpStatusCode.ServiceUnavailable || 
+                            response.StatusCode == System.Net.HttpStatusCode.InternalServerError)
+                        {
+                            hasUnhealthy = true;
+                        }
+                    }
+
+                    _logger.LogInformation("External service {Service} health check: {Status} in {Duration}ms",
+                                         service.Key, response.StatusCode, serviceStopwatch.ElapsedMilliseconds);
+                }
+                catch (Exception ex)
+                {
+                    serviceStopwatch.Stop();
+                    allHealthy = false;
+                    hasUnhealthy = true;
+
+                    results[service.Key] = new Dictionary<string, object>
+                    {
+                        { "status", "unhealthy" },
+                        { "duration", $"{serviceStopwatch.ElapsedMilliseconds}ms" },
+                        { "error", ex.Message },
+                        { "url", service.Value }
+                    };
+
+                    _logger.LogError(ex, "External service {Service} health check failed", service.Key);
+                }
+            }
+
+            stopwatch.Stop();
+            var totalDuration = stopwatch.ElapsedMilliseconds;
+
+            var data = new Dictionary<string, object>
+            {
+                { "status", hasUnhealthy ? "unhealthy" : (allHealthy ? "healthy" : "degraded") },
+                { "duration", $"{totalDuration}ms" },
+                { "services", results },
+                { "total_services", services.Count },
+                { "healthy_services", results.Values.Count(r => ((Dictionary<string, object>)r)["status"].ToString() == "healthy") }
+            };
+
+            if (hasUnhealthy)
+            {
+                return HealthCheckResult.Unhealthy("One or more external services are unhealthy", data: data);
+            }
+            
+            if (!allHealthy)
+            {
+                return HealthCheckResult.Degraded("Some external services have issues", data: data);
+            }
+
+            return HealthCheckResult.Healthy($"All external services are responsive ({totalDuration}ms)", data: data);
+        }
+        catch (Exception ex)
+        {
+            stopwatch.Stop();
+            var duration = stopwatch.ElapsedMilliseconds;
+
+            _logger.LogError(ex, "External services health check failed after {Duration}ms", duration);
+
+            var data = new Dictionary<string, object>
+            {
+                { "status", "unhealthy" },
+                { "duration", $"{duration}ms" },
+                { "error", ex.Message }
+            };
+
+            return HealthCheckResult.Unhealthy($"External services check failed: {ex.Message}", ex, data);
+        }
+    }
+}

src/BCards.Web/HealthChecks/MongoDbHealthCheck.cs

@@ -0,0 +1,73 @@
+using Microsoft.Extensions.Diagnostics.HealthChecks;
+using MongoDB.Driver;
+using MongoDB.Bson;
+using System.Diagnostics;
+
+namespace BCards.Web.HealthChecks;
+
+public class MongoDbHealthCheck : IHealthCheck
+{
+    private readonly IMongoDatabase _database;
+    private readonly ILogger<MongoDbHealthCheck> _logger;
+
+    public MongoDbHealthCheck(IMongoDatabase database, ILogger<MongoDbHealthCheck> logger)
+    {
+        _database = database;
+        _logger = logger;
+    }
+
+    public async Task<HealthCheckResult> CheckHealthAsync(
+        HealthCheckContext context,
+        CancellationToken cancellationToken = default)
+    {
+        var stopwatch = Stopwatch.StartNew();
+        
+        try
+        {
+            // Executa ping no MongoDB
+            var command = new BsonDocument("ping", 1);
+            await _database.RunCommandAsync<BsonDocument>(command, cancellationToken: cancellationToken);
+            
+            stopwatch.Stop();
+            var duration = stopwatch.ElapsedMilliseconds;
+
+            _logger.LogInformation("MongoDB health check completed successfully in {Duration}ms", duration);
+
+            var data = new Dictionary<string, object>
+            {
+                { "status", "healthy" },
+                { "duration", $"{duration}ms" },
+                { "database", _database.DatabaseNamespace.DatabaseName },
+                { "connection_state", "connected" },
+                { "latency", duration }
+            };
+
+            // Status baseado na latência
+            if (duration > 5000) // > 5s
+                return HealthCheckResult.Unhealthy($"MongoDB response time too high: {duration}ms", data: data);
+            
+            if (duration > 2000) // > 2s
+                return HealthCheckResult.Degraded($"MongoDB response time elevated: {duration}ms", data: data);
+
+            return HealthCheckResult.Healthy($"MongoDB is responsive ({duration}ms)", data: data);
+        }
+        catch (Exception ex)
+        {
+            stopwatch.Stop();
+            var duration = stopwatch.ElapsedMilliseconds;
+
+            _logger.LogError(ex, "MongoDB health check failed after {Duration}ms", duration);
+
+            var data = new Dictionary<string, object>
+            {
+                { "status", "unhealthy" },
+                { "duration", $"{duration}ms" },
+                { "database", _database.DatabaseNamespace.DatabaseName },
+                { "connection_state", "disconnected" },
+                { "error", ex.Message }
+            };
+
+            return HealthCheckResult.Unhealthy($"MongoDB connection failed: {ex.Message}", ex, data);
+        }
+    }
+}

src/BCards.Web/HealthChecks/SendGridHealthCheck.cs

@@ -0,0 +1,95 @@
+using Microsoft.Extensions.Diagnostics.HealthChecks;
+using SendGrid;
+using SendGrid.Helpers.Mail;
+using System.Diagnostics;
+
+namespace BCards.Web.HealthChecks;
+
+public class SendGridHealthCheck : IHealthCheck
+{
+    private readonly ISendGridClient _sendGridClient;
+    private readonly ILogger<SendGridHealthCheck> _logger;
+    private readonly IConfiguration _configuration;
+
+    public SendGridHealthCheck(ISendGridClient sendGridClient, ILogger<SendGridHealthCheck> logger, IConfiguration configuration)
+    {
+        _sendGridClient = sendGridClient;
+        _logger = logger;
+        _configuration = configuration;
+    }
+
+    public async Task<HealthCheckResult> CheckHealthAsync(
+        HealthCheckContext context,
+        CancellationToken cancellationToken = default)
+    {
+        var stopwatch = Stopwatch.StartNew();
+
+        try
+        {
+            // Testa a API do SendGrid fazendo uma validação de API key
+            // Usando endpoint de templates que não requer parâmetros específicos
+            var response = await _sendGridClient.RequestAsync(
+                method: SendGridClient.Method.GET,
+                urlPath: "templates",
+                queryParams: "{\"generations\":\"legacy,dynamic\",\"page_size\":1}",
+                cancellationToken: cancellationToken);
+
+            stopwatch.Stop();
+            var duration = stopwatch.ElapsedMilliseconds;
+
+            var apiKey = _configuration["SendGrid:ApiKey"];
+            var apiKeyPrefix = string.IsNullOrEmpty(apiKey) ? "not_configured" : 
+                              apiKey.Substring(0, Math.Min(8, apiKey.Length)) + "...";
+
+            _logger.LogInformation("SendGrid health check completed with status {StatusCode} in {Duration}ms", 
+                                 response.StatusCode, duration);
+
+            var data = new Dictionary<string, object>
+            {
+                { "status", response.IsSuccessStatusCode ? "healthy" : "unhealthy" },
+                { "duration", $"{duration}ms" },
+                { "status_code", (int)response.StatusCode },
+                { "api_key_prefix", apiKeyPrefix },
+                { "latency", duration }
+            };
+
+            // Verifica se a resposta foi bem-sucedida
+            if (response.IsSuccessStatusCode)
+            {
+                // Status baseado na latência
+                if (duration > 8000) // > 8s
+                    return HealthCheckResult.Unhealthy($"SendGrid response time too high: {duration}ms", data: data);
+                
+                if (duration > 4000) // > 4s
+                    return HealthCheckResult.Degraded($"SendGrid response time elevated: {duration}ms", data: data);
+
+                return HealthCheckResult.Healthy($"SendGrid API is responsive ({duration}ms)", data: data);
+            }
+            else
+            {
+                data["error"] = $"HTTP {response.StatusCode}";
+                data["response_body"] = response.Body;
+                
+                return HealthCheckResult.Unhealthy(
+                    $"SendGrid API returned {response.StatusCode}", 
+                    data: data);
+            }
+        }
+        catch (Exception ex)
+        {
+            stopwatch.Stop();
+            var duration = stopwatch.ElapsedMilliseconds;
+
+            _logger.LogError(ex, "SendGrid health check failed after {Duration}ms", duration);
+
+            var data = new Dictionary<string, object>
+            {
+                { "status", "unhealthy" },
+                { "duration", $"{duration}ms" },
+                { "error", ex.Message }
+            };
+
+            return HealthCheckResult.Unhealthy($"SendGrid connection failed: {ex.Message}", ex, data);
+        }
+    }
+}

src/BCards.Web/HealthChecks/StripeHealthCheck.cs

@@ -0,0 +1,94 @@
+using Microsoft.Extensions.Diagnostics.HealthChecks;
+using Microsoft.Extensions.Options;
+using BCards.Web.Configuration;
+using Stripe;
+using System.Diagnostics;
+
+namespace BCards.Web.HealthChecks;
+
+public class StripeHealthCheck : IHealthCheck
+{
+    private readonly StripeSettings _stripeSettings;
+    private readonly ILogger<StripeHealthCheck> _logger;
+
+    public StripeHealthCheck(IOptions<StripeSettings> stripeSettings, ILogger<StripeHealthCheck> logger)
+    {
+        _stripeSettings = stripeSettings.Value;
+        _logger = logger;
+    }
+
+    public async Task<HealthCheckResult> CheckHealthAsync(
+        HealthCheckContext context,
+        CancellationToken cancellationToken = default)
+    {
+        var stopwatch = Stopwatch.StartNew();
+
+        try
+        {
+            // Configura Stripe temporariamente para o teste
+            StripeConfiguration.ApiKey = _stripeSettings.SecretKey;
+            
+            // Testa conectividade listando produtos (limite 1 para ser rápido)
+            var productService = new ProductService();
+            var options = new ProductListOptions { Limit = 1 };
+            
+            await productService.ListAsync(options, cancellationToken: cancellationToken);
+            
+            stopwatch.Stop();
+            var duration = stopwatch.ElapsedMilliseconds;
+
+            _logger.LogInformation("Stripe health check completed successfully in {Duration}ms", duration);
+
+            var data = new Dictionary<string, object>
+            {
+                { "status", "healthy" },
+                { "duration", $"{duration}ms" },
+                { "api_key_prefix", _stripeSettings.SecretKey?.Substring(0, Math.Min(12, _stripeSettings.SecretKey.Length)) + "..." },
+                { "latency", duration }
+            };
+
+            // Status baseado na latência
+            if (duration > 10000) // > 10s
+                return HealthCheckResult.Unhealthy($"Stripe response time too high: {duration}ms", data: data);
+            
+            if (duration > 5000) // > 5s
+                return HealthCheckResult.Degraded($"Stripe response time elevated: {duration}ms", data: data);
+
+            return HealthCheckResult.Healthy($"Stripe API is responsive ({duration}ms)", data: data);
+        }
+        catch (StripeException stripeEx)
+        {
+            stopwatch.Stop();
+            var duration = stopwatch.ElapsedMilliseconds;
+
+            _logger.LogError(stripeEx, "Stripe health check failed after {Duration}ms: {Error}", duration, stripeEx.Message);
+
+            var data = new Dictionary<string, object>
+            {
+                { "status", "unhealthy" },
+                { "duration", $"{duration}ms" },
+                { "error", stripeEx.Message },
+                { "error_code", stripeEx.StripeError?.Code ?? "unknown" },
+                { "error_type", stripeEx.StripeError?.Type ?? "unknown" }
+            };
+
+            return HealthCheckResult.Unhealthy($"Stripe API error: {stripeEx.Message}", stripeEx, data);
+        }
+        catch (Exception ex)
+        {
+            stopwatch.Stop();
+            var duration = stopwatch.ElapsedMilliseconds;
+
+            _logger.LogError(ex, "Stripe health check failed after {Duration}ms", duration);
+
+            var data = new Dictionary<string, object>
+            {
+                { "status", "unhealthy" },
+                { "duration", $"{duration}ms" },
+                { "error", ex.Message }
+            };
+
+            return HealthCheckResult.Unhealthy($"Stripe connection failed: {ex.Message}", ex, data);
+        }
+    }
+}

src/BCards.Web/HealthChecks/SystemResourcesHealthCheck.cs

@@ -0,0 +1,134 @@
+using Microsoft.Extensions.Diagnostics.HealthChecks;
+using System.Diagnostics;
+
+namespace BCards.Web.HealthChecks;
+
+public class SystemResourcesHealthCheck : IHealthCheck
+{
+    private readonly ILogger<SystemResourcesHealthCheck> _logger;
+    private static readonly DateTime _startTime = DateTime.UtcNow;
+
+    public SystemResourcesHealthCheck(ILogger<SystemResourcesHealthCheck> logger)
+    {
+        _logger = logger;
+    }
+
+    public Task<HealthCheckResult> CheckHealthAsync(
+        HealthCheckContext context,
+        CancellationToken cancellationToken = default)
+    {
+        var stopwatch = Stopwatch.StartNew();
+
+        try
+        {
+            // Informações de memória
+            var totalMemory = GC.GetTotalMemory(false);
+            var workingSet = Environment.WorkingSet;
+            
+            // Informações do processo atual
+            using var currentProcess = Process.GetCurrentProcess();
+            var cpuUsage = GetCpuUsage(currentProcess);
+            
+            // Uptime
+            var uptime = DateTime.UtcNow - _startTime;
+            var uptimeString = FormatUptime(uptime);
+
+            // Thread count
+            var threadCount = currentProcess.Threads.Count;
+
+            stopwatch.Stop();
+            var duration = stopwatch.ElapsedMilliseconds;
+
+            var data = new Dictionary<string, object>
+            {
+                { "status", "healthy" },
+                { "duration", $"{duration}ms" },
+                { "memory", new Dictionary<string, object>
+                    {
+                        { "total_managed_mb", Math.Round(totalMemory / 1024.0 / 1024.0, 2) },
+                        { "working_set_mb", Math.Round(workingSet / 1024.0 / 1024.0, 2) },
+                        { "gc_generation_0", GC.CollectionCount(0) },
+                        { "gc_generation_1", GC.CollectionCount(1) },
+                        { "gc_generation_2", GC.CollectionCount(2) }
+                    }
+                },
+                { "process", new Dictionary<string, object>
+                    {
+                        { "id", currentProcess.Id },
+                        { "threads", threadCount },
+                        { "handles", currentProcess.HandleCount },
+                        { "uptime", uptimeString },
+                        { "uptime_seconds", (int)uptime.TotalSeconds }
+                    }
+                },
+                { "system", new Dictionary<string, object>
+                    {
+                        { "processor_count", Environment.ProcessorCount },
+                        { "os_version", Environment.OSVersion.ToString() },
+                        { "machine_name", Environment.MachineName },
+                        { "user_name", Environment.UserName }
+                    }
+                }
+            };
+
+            _logger.LogInformation("System resources health check completed in {Duration}ms - Memory: {Memory}MB, Threads: {Threads}",
+                                 duration, Math.Round(totalMemory / 1024.0 / 1024.0, 1), threadCount);
+
+            // Definir thresholds para status
+            var memoryMb = totalMemory / 1024.0 / 1024.0;
+            
+            if (memoryMb > 1000) // > 1GB
+            {
+                data["status"] = "degraded";
+                return Task.FromResult(HealthCheckResult.Degraded($"High memory usage: {memoryMb:F1}MB", data: data));
+            }
+
+            if (threadCount > 500)
+            {
+                data["status"] = "degraded"; 
+                return Task.FromResult(HealthCheckResult.Degraded($"High thread count: {threadCount}", data: data));
+            }
+
+            return Task.FromResult(HealthCheckResult.Healthy($"System resources normal (Memory: {memoryMb:F1}MB, Threads: {threadCount})", data: data));
+        }
+        catch (Exception ex)
+        {
+            stopwatch.Stop();
+            var duration = stopwatch.ElapsedMilliseconds;
+
+            _logger.LogError(ex, "System resources health check failed after {Duration}ms", duration);
+
+            var data = new Dictionary<string, object>
+            {
+                { "status", "unhealthy" },
+                { "duration", $"{duration}ms" },
+                { "error", ex.Message }
+            };
+
+            return Task.FromResult(HealthCheckResult.Unhealthy($"System resources check failed: {ex.Message}", ex, data));
+        }
+    }
+
+    private static double GetCpuUsage(Process process)
+    {
+        try
+        {
+            return process.TotalProcessorTime.TotalMilliseconds;
+        }
+        catch
+        {
+            return 0;
+        }
+    }
+
+    private static string FormatUptime(TimeSpan uptime)
+    {
+        if (uptime.TotalDays >= 1)
+            return $"{(int)uptime.TotalDays}d {uptime.Hours}h {uptime.Minutes}m";
+        if (uptime.TotalHours >= 1)
+            return $"{uptime.Hours}h {uptime.Minutes}m";
+        if (uptime.TotalMinutes >= 1)
+            return $"{uptime.Minutes}m {uptime.Seconds}s";
+        return $"{uptime.Seconds}s";
+    }
+}

src/BCards.Web/Program.cs

@@ -1,6 +1,7 @@
 using BCards.Web.Configuration;
 using BCards.Web.Services;
 using BCards.Web.Repositories;
+using BCards.Web.HealthChecks;
 using Microsoft.AspNetCore.Authentication.Cookies;
 using Microsoft.AspNetCore.Authentication.Google;
 using Microsoft.AspNetCore.Authentication.MicrosoftAccount;
@@ -14,9 +15,74 @@ using SendGrid;
 using BCards.Web.Middleware;
 using Microsoft.AspNetCore.Http.Features;
 using Microsoft.AspNetCore.HttpOverrides;
+using Serilog;
+using Serilog.Events;
+using Microsoft.Extensions.Diagnostics.HealthChecks;
 
 var builder = WebApplication.CreateBuilder(args);
 
+// Configure Serilog with environment-specific settings
+var isDevelopment = builder.Environment.IsDevelopment();
+var hostname = Environment.MachineName;
+
+var loggerConfig = new LoggerConfiguration()
+    .ReadFrom.Configuration(builder.Configuration)
+    .Enrich.FromLogContext()
+    .Enrich.WithEnvironmentName()
+    .Enrich.WithProcessId()
+    .Enrich.WithThreadId()
+    .Enrich.WithProperty("ApplicationName", builder.Configuration["ApplicationName"] ?? "BCards")
+    .Enrich.WithProperty("Environment", builder.Environment.EnvironmentName)
+    .Enrich.WithProperty("Hostname", hostname);
+
+if (isDevelopment)
+{
+    // Development: Log EVERYTHING to console with detailed formatting
+    loggerConfig
+        .MinimumLevel.Debug()
+        .MinimumLevel.Override("Microsoft", LogEventLevel.Information)
+        .MinimumLevel.Override("System", LogEventLevel.Information)
+        .WriteTo.Async(a => a.Console(
+            outputTemplate: "[{Timestamp:HH:mm:ss} {Level:u3}] [{Hostname}] {Message:lj} {Properties:j}{NewLine}{Exception}"));
+    
+    // Also send to Seq if configured (for local development with Seq)
+    var seqUrl = builder.Configuration["Serilog:SeqUrl"];
+    if (!string.IsNullOrEmpty(seqUrl))
+    {
+        var apiKey = builder.Configuration["Serilog:ApiKey"];
+        loggerConfig.WriteTo.Async(a => a.Seq(seqUrl, apiKey: string.IsNullOrEmpty(apiKey) ? null : apiKey));
+    }
+}
+else
+{
+    // Production: Only errors to console, everything to Seq
+    loggerConfig
+        .MinimumLevel.Information()
+        .MinimumLevel.Override("Microsoft", LogEventLevel.Warning)
+        .MinimumLevel.Override("System", LogEventLevel.Warning)
+        .WriteTo.Async(a => a.Console(
+            restrictedToMinimumLevel: LogEventLevel.Error,
+            outputTemplate: "[{Timestamp:yyyy-MM-dd HH:mm:ss} {Level:u3}] [{Hostname}] {Message:lj}{NewLine}{Exception}"));
+    
+    // Production: Send detailed logs to Seq
+    var seqUrl = builder.Configuration["Serilog:SeqUrl"];
+    if (!string.IsNullOrEmpty(seqUrl))
+    {
+        var apiKey = builder.Configuration["Serilog:ApiKey"];
+        loggerConfig.WriteTo.Async(a => a.Seq(seqUrl, 
+            apiKey: string.IsNullOrEmpty(apiKey) ? null : apiKey,
+            restrictedToMinimumLevel: LogEventLevel.Information));
+    }
+}
+
+Log.Logger = loggerConfig.CreateLogger();
+
+// Use Serilog for the host
+builder.Host.UseSerilog();
+
+// Log startup information
+Log.Information("Starting BCards application on {Hostname} in {Environment} mode", hostname, builder.Environment.EnvironmentName);
+
 // 🔥 CONFIGURAR FORWARDED HEADERS NO BUILDER
 builder.Services.Configure<ForwardedHeadersOptions>(options =>
 {
@@ -208,6 +274,52 @@ builder.Services.AddMemoryCache();
 
 builder.Services.AddRazorPages();
 
+// ===== CONFIGURAÇÃO DOS HEALTH CHECKS =====
+builder.Services.AddHealthChecks()
+    // MongoDB Health Check usando configuração existente
+    .AddCheck<MongoDbHealthCheck>(
+        name: "mongodb",
+        failureStatus: HealthStatus.Unhealthy,
+        timeout: TimeSpan.FromSeconds(10))
+    
+    // Stripe Health Check
+    .AddCheck<StripeHealthCheck>(
+        name: "stripe", 
+        failureStatus: HealthStatus.Degraded, // Stripe não é crítico para funcionalidade básica
+        timeout: TimeSpan.FromSeconds(15))
+    
+    // SendGrid Health Check
+    .AddCheck<SendGridHealthCheck>(
+        name: "sendgrid",
+        failureStatus: HealthStatus.Degraded, // Email não é crítico para funcionalidade básica
+        timeout: TimeSpan.FromSeconds(10))
+    
+    // External Services (OAuth providers)
+    .AddCheck<ExternalServicesHealthCheck>(
+        name: "external_services",
+        failureStatus: HealthStatus.Degraded, // OAuth pode estar indisponível temporariamente
+        timeout: TimeSpan.FromSeconds(20))
+    
+    // System Resources
+    .AddCheck<SystemResourcesHealthCheck>(
+        name: "resources",
+        failureStatus: HealthStatus.Degraded,
+        timeout: TimeSpan.FromSeconds(5));
+
+// Registrar health checks customizados no DI
+builder.Services.AddTransient<MongoDbHealthCheck>();
+builder.Services.AddTransient<StripeHealthCheck>();
+builder.Services.AddTransient<SendGridHealthCheck>();
+builder.Services.AddTransient<ExternalServicesHealthCheck>();
+builder.Services.AddTransient<SystemResourcesHealthCheck>();
+
+// HttpClient para External Services Health Check
+builder.Services.AddHttpClient<ExternalServicesHealthCheck>(client =>
+{
+    client.Timeout = TimeSpan.FromSeconds(10);
+    client.DefaultRequestHeaders.Add("User-Agent", "BCards-HealthCheck/1.0");
+});
+
 var app = builder.Build();
 
 // 🔥 PRIMEIRA COISA APÓS BUILD - FORWARDED HEADERS + BASE URL OVERRIDE
@@ -360,7 +472,21 @@ using (var scope = app.Services.CreateScope())
     }
 }
 
+try
+{
+    Log.Information("BCards application started successfully on {Hostname}", hostname);
     app.Run();
+}
+catch (Exception ex)
+{
+    Log.Fatal(ex, "BCards application terminated unexpectedly on {Hostname}", hostname);
+    throw;
+}
+finally
+{
+    Log.Information("BCards application shutting down on {Hostname}", hostname);
+    Log.CloseAndFlush();
+}
 
 // Make Program accessible for integration tests
 public partial class Program { }

src/BCards.Web/appsettings.Development.json

@@ -7,6 +7,10 @@
       "Microsoft.AspNetCore": "Warning"
     }
   },
+  "Serilog": {
+    "SeqUrl": "http://192.168.0.100:5341",
+    "ApiKey": ""
+  },
   "DetailedErrors": true,
   "MongoDb": {
     "ConnectionString": "mongodb://localhost:27017",

src/BCards.Web/appsettings.Release.json

@@ -5,6 +5,10 @@
       "Microsoft.AspNetCore": "Warning"
     }
   },
+  "Serilog": {
+    "SeqUrl": "http://seq.internal:5341",
+    "ApiKey": "YOUR_PRODUCTION_API_KEY"
+  },
   "MongoDb": {
     "ConnectionString": "mongodb://192.168.0.100:27017",
     "DatabaseName": "BCardsDB_Staging"

src/BCards.Web/appsettings.json

@@ -6,6 +6,10 @@
       "Microsoft.Hosting.Lifetime": "Information"
     }
   },
+  "Serilog": {
+    "SeqUrl": "http://localhost:5341",
+    "ApiKey": ""
+  },
   "AllowedHosts": "*",
   "Stripe": {
     "PublishableKey": "pk_test_51RjUmIBMIadsOxJVP4bWc54pHEOSf5km1hpOkOBSoGVoKxI46N4KSWtevpXCSq68OjFazBuXmPJGBwZ1KDN5MNJy003lj1YmAS",