🚀 Deployment Strategies - TuskLang for C# - "Deploy with Precision"

Master TuskLang deployment - From blue-green to canary, from rolling to immutable!

Deployment strategies are critical for production success. Learn how to deploy TuskLang configurations using advanced deployment patterns that ensure zero-downtime, rapid rollbacks, and seamless updates.

🎯 Deployment Philosophy

"We Don't Bow to Any King"

- Zero downtime - Deploy without service interruption - Rapid rollback - Rollback changes instantly - Progressive delivery - Deploy gradually and safely - Immutable infrastructure - Deploy immutable artifacts - Automated deployment - Fully automated deployment pipelines

Why Deployment Strategies Matter?

- Business continuity - Maintain service availability - Risk mitigation - Minimize deployment risks - User experience - Ensure seamless user experience - Operational efficiency - Streamline deployment processes - Quality assurance - Ensure deployment quality

🔄 Blue-Green Deployment

Blue-Green Deployment Service

// BlueGreenDeploymentService.cs
using TuskLang;
using TuskLang.Deployment;
using Microsoft.Extensions.DependencyInjection;
public class BlueGreenDeploymentService
{
    private readonly TuskLang _parser;
    private readonly ILoadBalancer _loadBalancer;
    private readonly IHealthChecker _healthChecker;
    private readonly ILogger<BlueGreenDeploymentService> _logger;
    
    public BlueGreenDeploymentService(
        ILoadBalancer loadBalancer,
        IHealthChecker healthChecker,
        ILogger<BlueGreenDeploymentService> logger)
    {
        _parser = new TuskLang();
        _loadBalancer = loadBalancer;
        _healthChecker = healthChecker;
        _logger = logger;
    }
    
    public async Task<BlueGreenDeploymentReport> DeployBlueGreenAsync(string filePath)
    {
        var report = new BlueGreenDeploymentReport
        {
            FilePath = filePath,
            StartedAt = DateTime.UtcNow
        };
        
        try
        {
            // Parse configuration
            var config = _parser.ParseFile(filePath);
            
            // Determine current environment (blue or green)
            var currentEnvironment = await DetermineCurrentEnvironmentAsync();
            var targetEnvironment = currentEnvironment == "blue" ? "green" : "blue";
            
            report.CurrentEnvironment = currentEnvironment;
            report.TargetEnvironment = targetEnvironment;
            
            // Deploy to target environment
            await DeployToEnvironmentAsync(config, targetEnvironment, report);
            
            // Health check target environment
            await HealthCheckEnvironmentAsync(targetEnvironment, report);
            
            // Switch traffic to target environment
            await SwitchTrafficAsync(targetEnvironment, report);
            
            // Verify deployment success
            await VerifyDeploymentAsync(targetEnvironment, report);
            
            // Clean up old environment
            await CleanupOldEnvironmentAsync(currentEnvironment, report);
            
            report.CompletedAt = DateTime.UtcNow;
            report.Duration = report.CompletedAt - report.StartedAt;
            report.Success = true;
            
            _logger.LogInformation("Blue-green deployment completed successfully in {Duration}", report.Duration);
            
            return report;
        }
        catch (Exception ex)
        {
            report.Errors.Add($"Blue-green deployment failed: {ex.Message}");
            report.Success = false;
            
            // Attempt rollback
            await RollbackDeploymentAsync(report);
            
            _logger.LogError(ex, "Blue-green deployment failed");
            throw;
        }
    }
    
    private async Task<string> DetermineCurrentEnvironmentAsync()
    {
        var blueHealth = await _healthChecker.CheckHealthAsync("blue");
        var greenHealth = await _healthChecker.CheckHealthAsync("green");
        
        if (blueHealth.IsHealthy && !greenHealth.IsHealthy)
        {
            return "blue";
        }
        else if (greenHealth.IsHealthy && !blueHealth.IsHealthy)
        {
            return "green";
        }
        else
        {
            // Both healthy or both unhealthy, check load balancer
            var activeEnvironment = await _loadBalancer.GetActiveEnvironmentAsync();
            return activeEnvironment ?? "blue";
        }
    }
    
    private async Task DeployToEnvironmentAsync(Dictionary<string, object> config, string environment, BlueGreenDeploymentReport report)
    {
        _logger.LogInformation("Deploying to {Environment} environment", environment);
        
        var deploymentStep = new DeploymentStep
        {
            Name = $"Deploy to {environment}",
            StartedAt = DateTime.UtcNow
        };
        
        try
        {
            // Deploy configuration to target environment
            await DeployConfigurationAsync(config, environment);
            
            // Wait for deployment to complete
            await WaitForDeploymentAsync(environment);
            
            deploymentStep.CompletedAt = DateTime.UtcNow;
            deploymentStep.Duration = deploymentStep.CompletedAt - deploymentStep.StartedAt;
            deploymentStep.Success = true;
            
            report.DeploymentSteps.Add(deploymentStep);
            
            _logger.LogInformation("Deployment to {Environment} completed in {Duration}", 
                environment, deploymentStep.Duration);
        }
        catch (Exception ex)
        {
            deploymentStep.CompletedAt = DateTime.UtcNow;
            deploymentStep.Duration = deploymentStep.CompletedAt - deploymentStep.StartedAt;
            deploymentStep.Success = false;
            deploymentStep.Error = ex.Message;
            
            report.DeploymentSteps.Add(deploymentStep);
            report.Errors.Add($"Deployment to {environment} failed: {ex.Message}");
            
            throw;
        }
    }
    
    private async Task HealthCheckEnvironmentAsync(string environment, BlueGreenDeploymentReport report)
    {
        _logger.LogInformation("Performing health check on {Environment} environment", environment);
        
        var healthStep = new DeploymentStep
        {
            Name = $"Health check {environment}",
            StartedAt = DateTime.UtcNow
        };
        
        try
        {
            // Perform comprehensive health checks
            var healthResult = await _healthChecker.PerformComprehensiveHealthCheckAsync(environment);
            
            if (!healthResult.IsHealthy)
            {
                throw new Exception($"Health check failed: {healthResult.Details}");
            }
            
            healthStep.CompletedAt = DateTime.UtcNow;
            healthStep.Duration = healthStep.CompletedAt - healthStep.StartedAt;
            healthStep.Success = true;
            healthStep.Details = $"All health checks passed: {healthResult.ChecksPassed}/{healthResult.TotalChecks}";
            
            report.DeploymentSteps.Add(healthStep);
            
            _logger.LogInformation("Health check for {Environment} passed in {Duration}", 
                environment, healthStep.Duration);
        }
        catch (Exception ex)
        {
            healthStep.CompletedAt = DateTime.UtcNow;
            healthStep.Duration = healthStep.CompletedAt - healthStep.StartedAt;
            healthStep.Success = false;
            healthStep.Error = ex.Message;
            
            report.DeploymentSteps.Add(healthStep);
            report.Errors.Add($"Health check for {environment} failed: {ex.Message}");
            
            throw;
        }
    }
    
    private async Task SwitchTrafficAsync(string environment, BlueGreenDeploymentReport report)
    {
        _logger.LogInformation("Switching traffic to {Environment} environment", environment);
        
        var switchStep = new DeploymentStep
        {
            Name = $"Switch traffic to {environment}",
            StartedAt = DateTime.UtcNow
        };
        
        try
        {
            // Gradually switch traffic
            await _loadBalancer.GraduallySwitchTrafficAsync(environment, TimeSpan.FromMinutes(5));
            
            // Verify traffic switch
            var activeEnvironment = await _loadBalancer.GetActiveEnvironmentAsync();
            if (activeEnvironment != environment)
            {
                throw new Exception($"Traffic switch failed. Expected: {environment}, Actual: {activeEnvironment}");
            }
            
            switchStep.CompletedAt = DateTime.UtcNow;
            switchStep.Duration = switchStep.CompletedAt - switchStep.StartedAt;
            switchStep.Success = true;
            
            report.DeploymentSteps.Add(switchStep);
            
            _logger.LogInformation("Traffic switched to {Environment} in {Duration}", 
                environment, switchStep.Duration);
        }
        catch (Exception ex)
        {
            switchStep.CompletedAt = DateTime.UtcNow;
            switchStep.Duration = switchStep.CompletedAt - switchStep.StartedAt;
            switchStep.Success = false;
            switchStep.Error = ex.Message;
            
            report.DeploymentSteps.Add(switchStep);
            report.Errors.Add($"Traffic switch failed: {ex.Message}");
            
            throw;
        }
    }
    
    private async Task VerifyDeploymentAsync(string environment, BlueGreenDeploymentReport report)
    {
        _logger.LogInformation("Verifying deployment on {Environment} environment", environment);
        
        var verifyStep = new DeploymentStep
        {
            Name = $"Verify {environment} deployment",
            StartedAt = DateTime.UtcNow
        };
        
        try
        {
            // Verify deployment metrics
            var metrics = await VerifyDeploymentMetricsAsync(environment);
            
            // Verify business functionality
            var functionality = await VerifyBusinessFunctionalityAsync(environment);
            
            // Verify performance
            var performance = await VerifyPerformanceAsync(environment);
            
            if (!metrics.Success || !functionality.Success || !performance.Success)
            {
                throw new Exception($"Deployment verification failed. Metrics: {metrics.Success}, Functionality: {functionality.Success}, Performance: {performance.Success}");
            }
            
            verifyStep.CompletedAt = DateTime.UtcNow;
            verifyStep.Duration = verifyStep.CompletedAt - verifyStep.StartedAt;
            verifyStep.Success = true;
            verifyStep.Details = $"All verifications passed. Response time: {performance.ResponseTime}ms, Error rate: {performance.ErrorRate}%";
            
            report.DeploymentSteps.Add(verifyStep);
            
            _logger.LogInformation("Deployment verification for {Environment} passed in {Duration}", 
                environment, verifyStep.Duration);
        }
        catch (Exception ex)
        {
            verifyStep.CompletedAt = DateTime.UtcNow;
            verifyStep.Duration = verifyStep.CompletedAt - verifyStep.StartedAt;
            verifyStep.Success = false;
            verifyStep.Error = ex.Message;
            
            report.DeploymentSteps.Add(verifyStep);
            report.Errors.Add($"Deployment verification failed: {ex.Message}");
            
            throw;
        }
    }
    
    private async Task CleanupOldEnvironmentAsync(string environment, BlueGreenDeploymentReport report)
    {
        _logger.LogInformation("Cleaning up {Environment} environment", environment);
        
        var cleanupStep = new DeploymentStep
        {
            Name = $"Cleanup {environment}",
            StartedAt = DateTime.UtcNow
        };
        
        try
        {
            // Wait for safety period
            await Task.Delay(TimeSpan.FromMinutes(10));
            
            // Clean up old environment
            await CleanupEnvironmentAsync(environment);
            
            cleanupStep.CompletedAt = DateTime.UtcNow;
            cleanupStep.Duration = cleanupStep.CompletedAt - cleanupStep.StartedAt;
            cleanupStep.Success = true;
            
            report.DeploymentSteps.Add(cleanupStep);
            
            _logger.LogInformation("Cleanup of {Environment} completed in {Duration}", 
                environment, cleanupStep.Duration);
        }
        catch (Exception ex)
        {
            cleanupStep.CompletedAt = DateTime.UtcNow;
            cleanupStep.Duration = cleanupStep.CompletedAt - cleanupStep.StartedAt;
            cleanupStep.Success = false;
            cleanupStep.Error = ex.Message;
            
            report.DeploymentSteps.Add(cleanupStep);
            report.Errors.Add($"Cleanup of {environment} failed: {ex.Message}");
            
            // Don't throw here as cleanup failure shouldn't fail the deployment
        }
    }
    
    private async Task RollbackDeploymentAsync(BlueGreenDeploymentReport report)
    {
        _logger.LogWarning("Initiating rollback to {Environment}", report.CurrentEnvironment);
        
        try
        {
            // Switch traffic back to original environment
            await _loadBalancer.SwitchTrafficAsync(report.CurrentEnvironment);
            
            // Verify rollback
            var activeEnvironment = await _loadBalancer.GetActiveEnvironmentAsync();
            if (activeEnvironment == report.CurrentEnvironment)
            {
                _logger.LogInformation("Rollback to {Environment} completed successfully", report.CurrentEnvironment);
            }
            else
            {
                _logger.LogError("Rollback failed. Expected: {Expected}, Actual: {Actual}", 
                    report.CurrentEnvironment, activeEnvironment);
            }
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Rollback failed");
        }
    }
    
    private async Task DeployConfigurationAsync(Dictionary<string, object> config, string environment)
    {
        // Deploy configuration to the specified environment
        // This would typically involve updating infrastructure, containers, or services
        await Task.Delay(TimeSpan.FromSeconds(30)); // Simulate deployment time
    }
    
    private async Task WaitForDeploymentAsync(string environment)
    {
        // Wait for deployment to complete and become ready
        await Task.Delay(TimeSpan.FromSeconds(60)); // Simulate deployment completion
    }
    
    private async Task<VerificationResult> VerifyDeploymentMetricsAsync(string environment)
    {
        // Verify deployment metrics
        await Task.Delay(TimeSpan.FromSeconds(10));
        return new VerificationResult { Success = true };
    }
    
    private async Task<VerificationResult> VerifyBusinessFunctionalityAsync(string environment)
    {
        // Verify business functionality
        await Task.Delay(TimeSpan.FromSeconds(15));
        return new VerificationResult { Success = true };
    }
    
    private async Task<PerformanceResult> VerifyPerformanceAsync(string environment)
    {
        // Verify performance
        await Task.Delay(TimeSpan.FromSeconds(10));
        return new PerformanceResult 
        { 
            Success = true, 
            ResponseTime = 150, 
            ErrorRate = 0.01 
        };
    }
    
    private async Task CleanupEnvironmentAsync(string environment)
    {
        // Clean up the old environment
        await Task.Delay(TimeSpan.FromSeconds(30)); // Simulate cleanup time
    }
}
public class BlueGreenDeploymentReport
{
    public string FilePath { get; set; } = string.Empty;
    public DateTime StartedAt { get; set; }
    public DateTime? CompletedAt { get; set; }
    public TimeSpan Duration => CompletedAt?.Subtract(StartedAt) ?? TimeSpan.Zero;
    public string CurrentEnvironment { get; set; } = string.Empty;
    public string TargetEnvironment { get; set; } = string.Empty;
    public List<DeploymentStep> DeploymentSteps { get; set; } = new List<DeploymentStep>();
    public List<string> Errors { get; set; } = new List<string>();
    public bool Success { get; set; }
}
public class DeploymentStep
{
    public string Name { get; set; } = string.Empty;
    public DateTime StartedAt { get; set; }
    public DateTime? CompletedAt { get; set; }
    public TimeSpan Duration => CompletedAt?.Subtract(StartedAt) ?? TimeSpan.Zero;
    public bool Success { get; set; }
    public string? Error { get; set; }
    public string? Details { get; set; }
}
public class VerificationResult
{
    public bool Success { get; set; }
    public string? Details { get; set; }
}
public class PerformanceResult
{
    public bool Success { get; set; }
    public int ResponseTime { get; set; }
    public double ErrorRate { get; set; }
}

Blue-Green TSK Configuration

blue-green-deployment.tsk - Blue-green deployment configuration
$deployment_strategy: "blue_green"
$current_environment: @env("CURRENT_ENVIRONMENT", "blue")
$target_environment: @if($current_environment == "blue", "green", "blue")
[deployment]
strategy: $deployment_strategy
current_environment: $current_environment
target_environment: $target_environment
auto_rollback: true
rollback_threshold: "5m"
[environments]
blue {
    name: "Blue Environment"
    endpoint: "https://blue.example.com"
    health_check_url: "/health"
    load_balancer_weight: @if($current_environment == "blue", 100, 0)
}
green {
    name: "Green Environment"
    endpoint: "https://green.example.com"
    health_check_url: "/health"
    load_balancer_weight: @if($current_environment == "green", 100, 0)
}
[health_checks]
Health check configuration
enabled: true
interval: "30s"
timeout: "10s"
retries: 3
Health check endpoints
endpoints {
    readiness: "/ready"
    liveness: "/health"
    startup: "/startup"
}
Health check criteria
criteria {
    response_time: "200ms"
    error_rate: "1%"
    success_rate: "99%"
}
[load_balancer]
Load balancer configuration
type: "application_load_balancer"
gradual_switch: true
switch_duration: "5m"
health_check_grace_period: "60s"
Traffic switching
traffic_switching {
    enabled: true
    gradual: true
    steps: 10
    step_duration: "30s"
}
[verification]
Deployment verification
enabled: true
verification_timeout: "10m"
Metrics verification
metrics {
    response_time_threshold: "200ms"
    error_rate_threshold: "1%"
    throughput_threshold: "1000_rps"
}
Business functionality verification
business_checks {
    enabled: true
    endpoints: ["/api/users", "/api/orders", "/api/payments"]
    expected_status_codes: [200, 201]
}
Performance verification
performance {
    enabled: true
    load_test_duration: "5m"
    concurrent_users: 100
    ramp_up_time: "1m"
}
[rollback]
Rollback configuration
enabled: true
automatic: true
trigger_conditions {
    health_check_failure: true
    performance_degradation: true
    error_rate_threshold: "5%"
    response_time_threshold: "500ms"
}
Rollback actions
actions {
    switch_traffic: true
    notify_team: true
    log_incident: true
    create_ticket: true
}
[cleanup]
Cleanup configuration
enabled: true
safety_period: "10m"
cleanup_actions {
    terminate_instances: true
    remove_load_balancer_targets: true
    delete_storage: false
    archive_logs: true
}

🎭 Canary Deployment

Canary Deployment Service

// CanaryDeploymentService.cs
using TuskLang;
using TuskLang.Deployment;
using Microsoft.Extensions.DependencyInjection;
public class CanaryDeploymentService
{
    private readonly TuskLang _parser;
    private readonly ILoadBalancer _loadBalancer;
    private readonly IMetricsCollector _metricsCollector;
    private readonly ILogger<CanaryDeploymentService> _logger;
    
    public CanaryDeploymentService(
        ILoadBalancer loadBalancer,
        IMetricsCollector metricsCollector,
        ILogger<CanaryDeploymentService> logger)
    {
        _parser = new TuskLang();
        _loadBalancer = loadBalancer;
        _metricsCollector = metricsCollector;
        _logger = logger;
    }
    
    public async Task<CanaryDeploymentReport> DeployCanaryAsync(string filePath)
    {
        var report = new CanaryDeploymentReport
        {
            FilePath = filePath,
            StartedAt = DateTime.UtcNow
        };
        
        try
        {
            // Parse configuration
            var config = _parser.ParseFile(filePath);
            
            // Deploy canary
            await DeployCanaryAsync(config, report);
            
            // Gradually increase traffic
            await GraduallyIncreaseTrafficAsync(report);
            
            // Monitor canary performance
            await MonitorCanaryPerformanceAsync(report);
            
            // Make deployment decision
            await MakeDeploymentDecisionAsync(report);
            
            report.CompletedAt = DateTime.UtcNow;
            report.Duration = report.CompletedAt - report.StartedAt;
            
            _logger.LogInformation("Canary deployment completed with decision: {Decision}", report.Decision);
            
            return report;
        }
        catch (Exception ex)
        {
            report.Errors.Add($"Canary deployment failed: {ex.Message}");
            report.Decision = CanaryDecision.Rollback;
            
            // Rollback canary
            await RollbackCanaryAsync(report);
            
            _logger.LogError(ex, "Canary deployment failed");
            throw;
        }
    }
    
    private async Task DeployCanaryAsync(Dictionary<string, object> config, CanaryDeploymentReport report)
    {
        _logger.LogInformation("Deploying canary");
        
        var deployStep = new CanaryStep
        {
            Name = "Deploy Canary",
            StartedAt = DateTime.UtcNow
        };
        
        try
        {
            // Deploy canary with minimal traffic
            await DeployCanaryWithMinimalTrafficAsync(config);
            
            // Verify canary deployment
            await VerifyCanaryDeploymentAsync();
            
            deployStep.CompletedAt = DateTime.UtcNow;
            deployStep.Duration = deployStep.CompletedAt - deployStep.StartedAt;
            deployStep.Success = true;
            
            report.Steps.Add(deployStep);
            
            _logger.LogInformation("Canary deployment completed in {Duration}", deployStep.Duration);
        }
        catch (Exception ex)
        {
            deployStep.CompletedAt = DateTime.UtcNow;
            deployStep.Duration = deployStep.CompletedAt - deployStep.StartedAt;
            deployStep.Success = false;
            deployStep.Error = ex.Message;
            
            report.Steps.Add(deployStep);
            report.Errors.Add($"Canary deployment failed: {ex.Message}");
            
            throw;
        }
    }
    
    private async Task GraduallyIncreaseTrafficAsync(CanaryDeploymentReport report)
    {
        _logger.LogInformation("Gradually increasing canary traffic");
        
        var trafficSteps = new[] { 1, 5, 10, 25, 50, 75, 100 };
        
        foreach (var percentage in trafficSteps)
        {
            var trafficStep = new CanaryStep
            {
                Name = $"Increase traffic to {percentage}%",
                StartedAt = DateTime.UtcNow
            };
            
            try
            {
                // Increase traffic to canary
                await _loadBalancer.SetCanaryTrafficAsync(percentage);
                
                // Wait for traffic to stabilize
                await Task.Delay(TimeSpan.FromMinutes(2));
                
                // Monitor canary performance
                var performance = await MonitorCanaryPerformanceAsync(percentage);
                
                if (!performance.IsHealthy)
                {
                    throw new Exception($"Canary performance degraded at {percentage}% traffic: {performance.Details}");
                }
                
                trafficStep.CompletedAt = DateTime.UtcNow;
                trafficStep.Duration = trafficStep.CompletedAt - trafficStep.StartedAt;
                trafficStep.Success = true;
                trafficStep.Details = $"Traffic increased to {percentage}%. Response time: {performance.ResponseTime}ms, Error rate: {performance.ErrorRate}%";
                
                report.Steps.Add(trafficStep);
                report.TrafficLevels.Add(new TrafficLevel
                {
                    Percentage = percentage,
                    ResponseTime = performance.ResponseTime,
                    ErrorRate = performance.ErrorRate,
                    IsHealthy = performance.IsHealthy
                });
                
                _logger.LogInformation("Traffic increased to {Percentage}% successfully", percentage);
            }
            catch (Exception ex)
            {
                trafficStep.CompletedAt = DateTime.UtcNow;
                trafficStep.Duration = trafficStep.CompletedAt - trafficStep.StartedAt;
                trafficStep.Success = false;
                trafficStep.Error = ex.Message;
                
                report.Steps.Add(trafficStep);
                report.Errors.Add($"Traffic increase to {percentage}% failed: {ex.Message}");
                
                throw;
            }
        }
    }
    
    private async Task MonitorCanaryPerformanceAsync(CanaryDeploymentReport report)
    {
        _logger.LogInformation("Monitoring canary performance");
        
        var monitorStep = new CanaryStep
        {
            Name = "Monitor Performance",
            StartedAt = DateTime.UtcNow
        };
        
        try
        {
            // Monitor canary for extended period
            await Task.Delay(TimeSpan.FromMinutes(10));
            
            // Collect comprehensive metrics
            var metrics = await _metricsCollector.CollectCanaryMetricsAsync();
            
            // Analyze performance trends
            var analysis = await AnalyzePerformanceTrendsAsync(metrics);
            
            if (!analysis.IsStable)
            {
                throw new Exception($"Canary performance is not stable: {analysis.Details}");
            }
            
            monitorStep.CompletedAt = DateTime.UtcNow;
            monitorStep.Duration = monitorStep.CompletedAt - monitorStep.StartedAt;
            monitorStep.Success = true;
            monitorStep.Details = $"Performance monitoring completed. Average response time: {analysis.AverageResponseTime}ms, Error rate: {analysis.AverageErrorRate}%";
            
            report.Steps.Add(monitorStep);
            report.PerformanceAnalysis = analysis;
            
            _logger.LogInformation("Canary performance monitoring completed successfully");
        }
        catch (Exception ex)
        {
            monitorStep.CompletedAt = DateTime.UtcNow;
            monitorStep.Duration = monitorStep.CompletedAt - monitorStep.StartedAt;
            monitorStep.Success = false;
            monitorStep.Error = ex.Message;
            
            report.Steps.Add(monitorStep);
            report.Errors.Add($"Performance monitoring failed: {ex.Message}");
            
            throw;
        }
    }
    
    private async Task MakeDeploymentDecisionAsync(CanaryDeploymentReport report)
    {
        _logger.LogInformation("Making deployment decision");
        
        var decisionStep = new CanaryStep
        {
            Name = "Make Deployment Decision",
            StartedAt = DateTime.UtcNow
        };
        
        try
        {
            // Evaluate canary performance
            var evaluation = await EvaluateCanaryPerformanceAsync(report);
            
            if (evaluation.ShouldPromote)
            {
                // Promote canary to production
                await PromoteCanaryToProductionAsync();
                report.Decision = CanaryDecision.Promote;
                decisionStep.Details = "Canary promoted to production successfully";
            }
            else
            {
                // Rollback canary
                await RollbackCanaryAsync(report);
                report.Decision = CanaryDecision.Rollback;
                decisionStep.Details = $"Canary rolled back: {evaluation.Reason}";
            }
            
            decisionStep.CompletedAt = DateTime.UtcNow;
            decisionStep.Duration = decisionStep.CompletedAt - decisionStep.StartedAt;
            decisionStep.Success = true;
            
            report.Steps.Add(decisionStep);
            
            _logger.LogInformation("Deployment decision made: {Decision}", report.Decision);
        }
        catch (Exception ex)
        {
            decisionStep.CompletedAt = DateTime.UtcNow;
            decisionStep.Duration = decisionStep.CompletedAt - decisionStep.StartedAt;
            decisionStep.Success = false;
            decisionStep.Error = ex.Message;
            
            report.Steps.Add(decisionStep);
            report.Errors.Add($"Deployment decision failed: {ex.Message}");
            
            // Default to rollback on error
            report.Decision = CanaryDecision.Rollback;
            await RollbackCanaryAsync(report);
            
            throw;
        }
    }
    
    private async Task RollbackCanaryAsync(CanaryDeploymentReport report)
    {
        _logger.LogWarning("Rolling back canary deployment");
        
        try
        {
            // Remove canary traffic
            await _loadBalancer.SetCanaryTrafficAsync(0);
            
            // Terminate canary instances
            await TerminateCanaryInstancesAsync();
            
            _logger.LogInformation("Canary rollback completed successfully");
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Canary rollback failed");
        }
    }
    
    private async Task DeployCanaryWithMinimalTrafficAsync(Dictionary<string, object> config)
    {
        // Deploy canary with minimal traffic
        await Task.Delay(TimeSpan.FromSeconds(30)); // Simulate deployment
    }
    
    private async Task VerifyCanaryDeploymentAsync()
    {
        // Verify canary deployment
        await Task.Delay(TimeSpan.FromSeconds(10)); // Simulate verification
    }
    
    private async Task<PerformanceMetrics> MonitorCanaryPerformanceAsync(int trafficPercentage)
    {
        // Monitor canary performance at specific traffic level
        await Task.Delay(TimeSpan.FromSeconds(30)); // Simulate monitoring
        
        return new PerformanceMetrics
        {
            ResponseTime = 150 + (trafficPercentage * 2), // Simulate response time
            ErrorRate = 0.01 + (trafficPercentage * 0.001), // Simulate error rate
            IsHealthy = true
        };
    }
    
    private async Task<PerformanceAnalysis> AnalyzePerformanceTrendsAsync(List<PerformanceMetrics> metrics)
    {
        // Analyze performance trends
        await Task.Delay(TimeSpan.FromSeconds(10)); // Simulate analysis
        
        return new PerformanceAnalysis
        {
            IsStable = true,
            AverageResponseTime = 180,
            AverageErrorRate = 0.02,
            Details = "Performance is stable and within acceptable limits"
        };
    }
    
    private async Task<CanaryEvaluation> EvaluateCanaryPerformanceAsync(CanaryDeploymentReport report)
    {
        // Evaluate canary performance
        await Task.Delay(TimeSpan.FromSeconds(10)); // Simulate evaluation
        
        var averageErrorRate = report.TrafficLevels.Average(t => t.ErrorRate);
        var averageResponseTime = report.TrafficLevels.Average(t => t.ResponseTime);
        
        return new CanaryEvaluation
        {
            ShouldPromote = averageErrorRate < 0.05 && averageResponseTime < 300,
            Reason = averageErrorRate < 0.05 && averageResponseTime < 300 
                ? "Performance meets promotion criteria" 
                : $"Performance does not meet criteria. Error rate: {averageErrorRate:P}, Response time: {averageResponseTime}ms"
        };
    }
    
    private async Task PromoteCanaryToProductionAsync()
    {
        // Promote canary to production
        await Task.Delay(TimeSpan.FromSeconds(30)); // Simulate promotion
    }
    
    private async Task TerminateCanaryInstancesAsync()
    {
        // Terminate canary instances
        await Task.Delay(TimeSpan.FromSeconds(20)); // Simulate termination
    }
}
public class CanaryDeploymentReport
{
    public string FilePath { get; set; } = string.Empty;
    public DateTime StartedAt { get; set; }
    public DateTime? CompletedAt { get; set; }
    public TimeSpan Duration => CompletedAt?.Subtract(StartedAt) ?? TimeSpan.Zero;
    public List<CanaryStep> Steps { get; set; } = new List<CanaryStep>();
    public List<TrafficLevel> TrafficLevels { get; set; } = new List<TrafficLevel>();
    public PerformanceAnalysis? PerformanceAnalysis { get; set; }
    public List<string> Errors { get; set; } = new List<string>();
    public CanaryDecision Decision { get; set; }
}
public class CanaryStep
{
    public string Name { get; set; } = string.Empty;
    public DateTime StartedAt { get; set; }
    public DateTime? CompletedAt { get; set; }
    public TimeSpan Duration => CompletedAt?.Subtract(StartedAt) ?? TimeSpan.Zero;
    public bool Success { get; set; }
    public string? Error { get; set; }
    public string? Details { get; set; }
}
public class TrafficLevel
{
    public int Percentage { get; set; }
    public int ResponseTime { get; set; }
    public double ErrorRate { get; set; }
    public bool IsHealthy { get; set; }
}
public class PerformanceMetrics
{
    public int ResponseTime { get; set; }
    public double ErrorRate { get; set; }
    public bool IsHealthy { get; set; }
}
public class PerformanceAnalysis
{
    public bool IsStable { get; set; }
    public int AverageResponseTime { get; set; }
    public double AverageErrorRate { get; set; }
    public string Details { get; set; } = string.Empty;
}
public class CanaryEvaluation
{
    public bool ShouldPromote { get; set; }
    public string Reason { get; set; } = string.Empty;
}
public enum CanaryDecision
{
    Promote,
    Rollback,
    Continue
}

Canary TSK Configuration

canary-deployment.tsk - Canary deployment configuration
$deployment_strategy: "canary"
$canary_percentage: @env("CANARY_PERCENTAGE", "1")
$promotion_criteria: @env("PROMOTION_CRITERIA", "strict")
[deployment]
strategy: $deployment_strategy
canary_percentage: $canary_percentage
promotion_criteria: $promotion_criteria
auto_rollback: true
[canary]
Canary configuration
enabled: true
initial_traffic: 1
max_traffic: 100
traffic_increment: 5
increment_interval: "2m"
Canary health checks
health_checks {
    enabled: true
    interval: "30s"
    timeout: "10s"
    retries: 3
    endpoints: ["/health", "/ready", "/live"]
}
[traffic_routing]
Traffic routing configuration
type: "weighted"
canary_weight: $canary_percentage
production_weight: @calc(100 - $canary_percentage)
Traffic distribution
distribution {
    method: "random"
    session_affinity: false
    cookie_based: false
}
[monitoring]
Canary monitoring
enabled: true
monitoring_duration: "10m"
metrics_interval: "30s"
Performance metrics
metrics {
    response_time {
        threshold: "200ms"
        alert_threshold: "500ms"
    }
    error_rate {
        threshold: "1%"
        alert_threshold: "5%"
    }
    throughput {
        threshold: "1000_rps"
        alert_threshold: "500_rps"
    }
}
Business metrics
business_metrics {
    conversion_rate {
        threshold: "2%"
        alert_threshold: "1%"
    }
    user_satisfaction {
        threshold: "4.5"
        alert_threshold: "4.0"
    }
}
[promotion_criteria]
Promotion criteria
strict {
    response_time_max: "200ms"
    error_rate_max: "1%"
    throughput_min: "1000_rps"
    business_metrics_ok: true
}
moderate {
    response_time_max: "300ms"
    error_rate_max: "2%"
    throughput_min: "800_rps"
    business_metrics_ok: true
}
relaxed {
    response_time_max: "500ms"
    error_rate_max: "5%"
    throughput_min: "500_rps"
    business_metrics_ok: false
}
[rollback]
Rollback configuration
enabled: true
automatic: true
trigger_conditions {
    response_time_exceeded: true
    error_rate_exceeded: true
    throughput_degraded: true
    business_metrics_degraded: true
}
Rollback actions
actions {
    reduce_traffic: true
    terminate_canary: true
    notify_team: true
    log_incident: true
}
[notifications]
Notification configuration
enabled: true
channels {
    email: ["devops@example.com", "sre@example.com"]
    slack: "#deployments"
    pagerduty: "deployment-alerts"
}
Notification events
events {
    canary_started: true
    traffic_increased: true
    performance_degraded: true
    canary_promoted: true
    canary_rolled_back: true
}

🎯 Deployment Best Practices

1. Blue-Green Deployment

- ✅ Zero downtime - Deploy without service interruption - ✅ Instant rollback - Rollback to previous environment instantly - ✅ Full testing - Test new environment before switching traffic - ✅ Clean separation - Keep environments completely separate

2. Canary Deployment

- ✅ Gradual rollout - Deploy to small percentage of users first - ✅ Real-time monitoring - Monitor performance in real-time - ✅ Automatic rollback - Rollback automatically on issues - ✅ Business metrics - Monitor business impact

3. Rolling Deployment

- ✅ Incremental updates - Update instances incrementally - ✅ Health checks - Verify health before proceeding - ✅ Rollback capability - Ability to rollback quickly - ✅ Load balancing - Maintain load balancing during deployment

4. Immutable Deployment

- ✅ Immutable artifacts - Deploy immutable containers/images - ✅ Version control - Track all deployment versions - ✅ Reproducible builds - Ensure reproducible deployments - ✅ Atomic updates - Update entire environment atomically

🎉 You're Ready!

You've mastered TuskLang deployment strategies! You can now:

- ✅ Deploy with zero downtime - Blue-green deployment patterns - ✅ Deploy gradually - Canary deployment strategies - ✅ Deploy incrementally - Rolling deployment patterns - ✅ Deploy immutably - Immutable deployment strategies - ✅ Monitor deployments - Real-time deployment monitoring - ✅ Rollback quickly - Rapid rollback capabilities

🔥 What's Next?

Ready for advanced architectures? Explore:

1. Advanced Architectures - Complex system architectures 2. Performance Optimization - Enterprise performance 3. Monitoring and Observability - Advanced monitoring

---

"We don't bow to any king" - Your deployment precision, your operational excellence, your deployment mastery.

Deploy with confidence and precision! 🚀