Workflow Versioning & Deployment

Comprehensive guide to managing workflow versions, deployments, and rollback strategies for production environments in Axon OS.

Overview

Workflow versioning enables you to manage different iterations of your workflows, deploy them safely to production, and roll back when needed. This ensures reliable automation in enterprise environments.

Key Features

• Semantic Versioning: Standard version numbering (major.minor.patch)
• Environment Management: Development, staging, and production environments
• Deployment Strategies: Blue-green, canary, and rolling deployments
• Rollback Capabilities: Quick restoration to previous versions
• Change Tracking: Complete audit trail of modifications
• Dependency Management: Version compatibility checking

Version Management

Version Schema

interface WorkflowVersion {
  id: string;
  workflowId: string;
  version: SemanticVersion;
  status: VersionStatus;
  metadata: VersionMetadata;
  definition: WorkflowDefinition;
  dependencies: WorkflowDependency[];
  deployments: Deployment[];
  createdAt: Date;
  createdBy: string;
}

interface SemanticVersion {
  major: number;    // Breaking changes
  minor: number;    // New features (backward compatible)
  patch: number;    // Bug fixes (backward compatible)
  prerelease?: string; // alpha, beta, rc
  build?: string;   // Build metadata
}

enum VersionStatus {
  DRAFT = 'draft',
  PUBLISHED = 'published',
  DEPRECATED = 'deprecated',
  ARCHIVED = 'archived'
}

interface VersionMetadata {
  title: string;
  description: string;
  changelog: ChangelogEntry[];
  tags: string[];
  compatibility: CompatibilityInfo;
}

Creating Versions

class WorkflowVersionManager {
  async createVersion(
    workflowId: string,
    versionType: 'major' | 'minor' | 'patch',
    changes: WorkflowChanges
  ): Promise<WorkflowVersion> {
    // Get current version
    const currentVersion = await this.getCurrentVersion(workflowId);
    
    // Calculate new version number
    const newVersion = this.incrementVersion(currentVersion.version, versionType);
    
    // Validate changes
    const validation = await this.validateChanges(changes, currentVersion);
    if (!validation.isValid) {
      throw new Error(`Invalid changes: ${validation.errors.join(', ')}`);
    }
    
    // Create new version
    const version = await this.createVersionRecord({
      workflowId,
      version: newVersion,
      definition: this.applyChanges(currentVersion.definition, changes),
      metadata: {
        title: changes.title || `Version ${newVersion.toString()}`,
        description: changes.description || '',
        changelog: this.generateChangelog(changes),
        tags: changes.tags || [],
        compatibility: this.analyzeCompatibility(currentVersion, changes)
      },
      status: VersionStatus.DRAFT,
      createdBy: changes.userId
    });
    
    return version;
  }
  
  private incrementVersion(
    current: SemanticVersion,
    type: 'major' | 'minor' | 'patch'
  ): SemanticVersion {
    switch (type) {
      case 'major':
        return { major: current.major + 1, minor: 0, patch: 0 };
      case 'minor':
        return { major: current.major, minor: current.minor + 1, patch: 0 };
      case 'patch':
        return { major: current.major, minor: current.minor, patch: current.patch + 1 };
    }
  }
}

Change Tracking

interface ChangelogEntry {
  type: 'added' | 'changed' | 'deprecated' | 'removed' | 'fixed' | 'security';
  description: string;
  impact: 'breaking' | 'feature' | 'bugfix';
  affectedComponents: string[];
  migration?: MigrationGuide;
}

interface WorkflowChanges {
  nodesAdded: NodeDefinition[];
  nodesRemoved: string[];
  nodesModified: NodeModification[];
  connectionsAdded: ConnectionDefinition[];
  connectionsRemoved: string[];
  configurationChanges: ConfigurationChange[];
  title?: string;
  description?: string;
  tags?: string[];
  userId: string;
}

interface NodeModification {
  nodeId: string;
  changes: {
    type?: string;
    config?: any;
    position?: Position;
    title?: string;
  };
  impact: 'breaking' | 'compatible';
}

// Automatic change detection
class ChangeDetector {
  detectChanges(
    oldDefinition: WorkflowDefinition,
    newDefinition: WorkflowDefinition
  ): WorkflowChanges {
    const changes: WorkflowChanges = {
      nodesAdded: [],
      nodesRemoved: [],
      nodesModified: [],
      connectionsAdded: [],
      connectionsRemoved: [],
      configurationChanges: [],
      userId: 'system'
    };
    
    // Detect node changes
    const oldNodeIds = new Set(oldDefinition.nodes.map(n => n.id));
    const newNodeIds = new Set(newDefinition.nodes.map(n => n.id));
    
    // Added nodes
    changes.nodesAdded = newDefinition.nodes.filter(n => !oldNodeIds.has(n.id));
    
    // Removed nodes
    changes.nodesRemoved = oldDefinition.nodes
      .filter(n => !newNodeIds.has(n.id))
      .map(n => n.id);
    
    // Modified nodes
    changes.nodesModified = this.detectNodeModifications(oldDefinition, newDefinition);
    
    // Detect connection changes
    changes.connectionsAdded = this.detectAddedConnections(oldDefinition, newDefinition);
    changes.connectionsRemoved = this.detectRemovedConnections(oldDefinition, newDefinition);
    
    return changes;
  }
}

Environment Management

Environment Configuration

interface Environment {
  id: string;
  name: string;
  type: 'development' | 'staging' | 'production';
  config: EnvironmentConfig;
  restrictions: EnvironmentRestrictions;
  approvalProcess: ApprovalProcess;
}

interface EnvironmentConfig {
  computeResources: ResourceLimits;
  networking: NetworkConfig;
  security: SecurityConfig;
  monitoring: MonitoringConfig;
  variables: EnvironmentVariables;
}

interface EnvironmentRestrictions {
  allowedVersionTypes: ('draft' | 'published')[];
  requiresApproval: boolean;
  maxConcurrentDeployments: number;
  deploymentWindows: DeploymentWindow[];
  rollbackPolicy: RollbackPolicy;
}

// Environment-specific configurations
const environments = {
  development: {
    id: 'dev',
    name: 'Development',
    type: 'development',
    config: {
      computeResources: {
        maxMemory: '2GB',
        maxCpu: '1 core',
        timeout: 300000
      },
      variables: {
        API_BASE_URL: 'https://api-dev.example.com',
        DATABASE_URL: 'postgresql://dev-db:5432/workflows',
        LOG_LEVEL: 'debug'
      }
    },
    restrictions: {
      allowedVersionTypes: ['draft', 'published'],
      requiresApproval: false,
      maxConcurrentDeployments: 10
    }
  },
  
  production: {
    id: 'prod',
    name: 'Production',
    type: 'production',
    config: {
      computeResources: {
        maxMemory: '8GB',
        maxCpu: '4 cores',
        timeout: 600000
      },
      variables: {
        API_BASE_URL: 'https://api.example.com',
        DATABASE_URL: 'postgresql://prod-db:5432/workflows',
        LOG_LEVEL: 'info'
      }
    },
    restrictions: {
      allowedVersionTypes: ['published'],
      requiresApproval: true,
      maxConcurrentDeployments: 3,
      deploymentWindows: [
        {
          start: '02:00',
          end: '04:00',
          timezone: 'UTC',
          days: ['tuesday', 'thursday']
        }
      ]
    }
  }
};

Environment Promotion

class EnvironmentPromotion {
  async promoteVersion(
    versionId: string,
    fromEnvironment: string,
    toEnvironment: string,
    options: PromotionOptions
  ): Promise<PromotionResult> {
    // Validate promotion
    const validation = await this.validatePromotion(versionId, fromEnvironment, toEnvironment);
    if (!validation.isValid) {
      throw new Error(`Promotion failed: ${validation.errors.join(', ')}`);
    }
    
    // Check approval requirements
    const approvalRequired = await this.checkApprovalRequirements(toEnvironment);
    if (approvalRequired && !options.approvalId) {
      return {
        status: 'pending_approval',
        approvalRequest: await this.createApprovalRequest(versionId, toEnvironment)
      };
    }
    
    // Execute promotion
    const deployment = await this.deployToEnvironment(versionId, toEnvironment, options);
    
    // Run validation tests
    const testResults = await this.runValidationTests(deployment);
    
    if (testResults.success) {
      await this.markPromotionComplete(deployment.id);
      return { status: 'success', deployment };
    } else {
      await this.rollbackDeployment(deployment.id);
      return { status: 'failed', errors: testResults.errors };
    }
  }
}

Deployment Strategies

Blue-Green Deployment

interface BlueGreenDeployment {
  strategy: 'blue-green';
  config: {
    healthCheckUrl?: string;
    healthCheckTimeout: number;
    switchTrafficDelay: number;
    keepOldVersion: boolean;
  };
}

class BlueGreenDeployer {
  async deploy(version: WorkflowVersion, environment: Environment): Promise<Deployment> {
    // Deploy to inactive environment (green)
    const greenDeployment = await this.deployToInactive(version, environment);
    
    // Run health checks
    const healthCheck = await this.runHealthChecks(greenDeployment);
    if (!healthCheck.healthy) {
      await this.rollbackDeployment(greenDeployment.id);
      throw new Error(`Health check failed: ${healthCheck.errors.join(', ')}`);
    }
    
    // Run smoke tests
    const smokeTests = await this.runSmokeTests(greenDeployment);
    if (!smokeTests.passed) {
      await this.rollbackDeployment(greenDeployment.id);
      throw new Error(`Smoke tests failed: ${smokeTests.failures.join(', ')}`);
    }
    
    // Switch traffic to green environment
    await this.switchTraffic(greenDeployment);
    
    // Mark blue environment as inactive
    await this.markInactive(await this.getCurrentActiveDeployment(environment));
    
    return greenDeployment;
  }
  
  private async runHealthChecks(deployment: Deployment): Promise<HealthCheckResult> {
    const checks = [
      this.checkWorkflowEngine(deployment),
      this.checkDatabaseConnectivity(deployment),
      this.checkExternalServices(deployment)
    ];
    
    const results = await Promise.all(checks);
    
    return {
      healthy: results.every(r => r.success),
      errors: results.filter(r => !r.success).map(r => r.error)
    };
  }
}

Canary Deployment

interface CanaryDeployment {
  strategy: 'canary';
  config: {
    trafficPercentage: number;
    incrementPercentage: number;
    incrementInterval: number;
    successThreshold: number;
    rollbackThreshold: number;
    maxDuration: number;
  };
}

class CanaryDeployer {
  async deploy(version: WorkflowVersion, environment: Environment): Promise<Deployment> {
    const canaryConfig = environment.deploymentStrategy.config as CanaryDeployment['config'];
    
    // Deploy canary version
    const canaryDeployment = await this.createCanaryDeployment(version, environment);
    
    // Start with small traffic percentage
    let currentTraffic = canaryConfig.trafficPercentage;
    await this.setTrafficSplit(canaryDeployment, currentTraffic);
    
    // Monitor and gradually increase traffic
    while (currentTraffic < 100) {
      await this.wait(canaryConfig.incrementInterval);
      
      // Check metrics
      const metrics = await this.getCanaryMetrics(canaryDeployment);
      
      if (metrics.errorRate > canaryConfig.rollbackThreshold) {
        await this.rollbackCanary(canaryDeployment);
        throw new Error(`Canary deployment failed: error rate ${metrics.errorRate}`);
      }
      
      if (metrics.successRate >= canaryConfig.successThreshold) {
        // Increase traffic
        currentTraffic = Math.min(100, currentTraffic + canaryConfig.incrementPercentage);
        await this.setTrafficSplit(canaryDeployment, currentTraffic);
      }
    }
    
    // Finalize deployment
    await this.promoteCanaryToProduction(canaryDeployment);
    
    return canaryDeployment;
  }
}

Rolling Deployment

interface RollingDeployment {
  strategy: 'rolling';
  config: {
    batchSize: number;
    batchDelay: number;
    maxUnavailable: number;
    healthCheckInterval: number;
  };
}

class RollingDeployer {
  async deploy(version: WorkflowVersion, environment: Environment): Promise<Deployment> {
    const rollingConfig = environment.deploymentStrategy.config as RollingDeployment['config'];
    
    // Get current instances
    const instances = await this.getCurrentInstances(environment);
    const batches = this.createBatches(instances, rollingConfig.batchSize);
    
    const deployment = await this.createRollingDeployment(version, environment);
    
    for (const batch of batches) {
      // Update batch
      await this.updateBatch(batch, version);
      
      // Wait for health checks
      await this.waitForBatchHealth(batch, rollingConfig.healthCheckInterval);
      
      // Wait before next batch
      if (batch !== batches[batches.length - 1]) {
        await this.wait(rollingConfig.batchDelay);
      }
    }
    
    return deployment;
  }
  
  private createBatches<T>(items: T[], batchSize: number): T[][] {
    const batches: T[][] = [];
    for (let i = 0; i < items.length; i += batchSize) {
      batches.push(items.slice(i, i + batchSize));
    }
    return batches;
  }
}

Rollback Strategies

Automatic Rollback

interface RollbackPolicy {
  automatic: {
    enabled: boolean;
    triggers: RollbackTrigger[];
    timeout: number;
  };
  manual: {
    enabled: boolean;
    approvalRequired: boolean;
  };
}

interface RollbackTrigger {
  type: 'error_rate' | 'response_time' | 'health_check' | 'custom_metric';
  threshold: number;
  duration: number;
  metric: string;
}

class AutomaticRollback {
  private monitors: Map<string, NodeJS.Timer> = new Map();
  
  startMonitoring(deployment: Deployment): void {
    const timer = setInterval(async () => {
      const metrics = await this.collectMetrics(deployment);
      
      for (const trigger of deployment.rollbackPolicy.automatic.triggers) {
        if (this.shouldTriggerRollback(metrics, trigger)) {
          await this.executeRollback(deployment, trigger);
          break;
        }
      }
    }, 30000); // Check every 30 seconds
    
    this.monitors.set(deployment.id, timer);
  }
  
  private shouldTriggerRollback(metrics: DeploymentMetrics, trigger: RollbackTrigger): boolean {
    const currentValue = metrics[trigger.metric];
    const threshold = trigger.threshold;
    
    switch (trigger.type) {
      case 'error_rate':
        return currentValue > threshold;
      case 'response_time':
        return currentValue > threshold;
      case 'health_check':
        return currentValue < threshold; // Health score below threshold
      default:
        return false;
    }
  }
  
  private async executeRollback(deployment: Deployment, trigger: RollbackTrigger): Promise<void> {
    console.log(`Auto-rollback triggered for deployment ${deployment.id}: ${trigger.type}`);
    
    // Stop monitoring
    this.stopMonitoring(deployment.id);
    
    // Execute rollback
    await this.rollbackToLastKnownGood(deployment);
    
    // Notify stakeholders
    await this.notifyRollback(deployment, trigger);
  }
}

Manual Rollback

class ManualRollback {
  async rollbackToVersion(
    currentDeployment: Deployment,
    targetVersionId: string,
    reason: string,
    userId: string
  ): Promise<RollbackResult> {
    // Validate rollback request
    const validation = await this.validateRollback(currentDeployment, targetVersionId);
    if (!validation.isValid) {
      throw new Error(`Rollback validation failed: ${validation.errors.join(', ')}`);
    }
    
    // Check approval requirements
    if (currentDeployment.environment.restrictions.rollbackPolicy.requiresApproval) {
      const approval = await this.createRollbackApproval(currentDeployment, targetVersionId, reason, userId);
      if (!approval.approved) {
        return { status: 'pending_approval', approvalId: approval.id };
      }
    }
    
    // Create rollback deployment
    const rollbackDeployment = await this.createRollbackDeployment(
      currentDeployment,
      targetVersionId,
      reason,
      userId
    );
    
    // Execute rollback based on original deployment strategy
    switch (currentDeployment.strategy) {
      case 'blue-green':
        await this.executeBlueGreenRollback(rollbackDeployment);
        break;
      case 'canary':
        await this.executeCanaryRollback(rollbackDeployment);
        break;
      case 'rolling':
        await this.executeRollingRollback(rollbackDeployment);
        break;
    }
    
    return { status: 'success', deployment: rollbackDeployment };
  }
}

Dependency Management

Version Dependencies

interface WorkflowDependency {
  type: 'workflow' | 'node' | 'service' | 'library';
  name: string;
  version: SemanticVersion;
  required: boolean;
  constraints: VersionConstraint[];
}

interface VersionConstraint {
  type: 'exact' | 'minimum' | 'maximum' | 'range' | 'compatible';
  version: SemanticVersion;
  operator?: '>=' | '>' | '<=' | '<' | '=';
}

class DependencyResolver {
  async resolveDependencies(workflow: WorkflowVersion): Promise<DependencyResolution> {
    const resolution: DependencyResolution = {
      resolved: [],
      conflicts: [],
      missing: []
    };
    
    for (const dependency of workflow.dependencies) {
      try {
        const resolvedVersion = await this.resolveVersion(dependency);
        resolution.resolved.push({
          dependency,
          resolvedVersion,
          compatible: this.isCompatible(dependency, resolvedVersion)
        });
      } catch (error) {
        if (error instanceof VersionNotFoundError) {
          resolution.missing.push(dependency);
        } else if (error instanceof VersionConflictError) {
          resolution.conflicts.push({
            dependency,
            conflictingVersions: error.conflictingVersions
          });
        }
      }
    }
    
    return resolution;
  }
  
  private async resolveVersion(dependency: WorkflowDependency): Promise<SemanticVersion> {
    const availableVersions = await this.getAvailableVersions(dependency);
    
    for (const constraint of dependency.constraints) {
      const satisfyingVersions = availableVersions.filter(version =>
        this.satisfiesConstraint(version, constraint)
      );
      
      if (satisfyingVersions.length === 0) {
        throw new VersionNotFoundError(dependency, constraint);
      }
      
      // Return highest compatible version
      return satisfyingVersions.sort(this.compareVersions).pop()!;
    }
    
    throw new VersionNotFoundError(dependency);
  }
}

Compatibility Checking

interface CompatibilityInfo {
  backward: CompatibilityLevel;
  forward: CompatibilityLevel;
  nodeCompatibility: Map<string, CompatibilityLevel>;
  apiCompatibility: ApiCompatibilityInfo;
}

enum CompatibilityLevel {
  COMPATIBLE = 'compatible',
  PARTIALLY_COMPATIBLE = 'partially_compatible',
  INCOMPATIBLE = 'incompatible',
  UNKNOWN = 'unknown'
}

class CompatibilityAnalyzer {
  analyzeCompatibility(
    oldVersion: WorkflowVersion,
    newVersion: WorkflowVersion
  ): CompatibilityInfo {
    return {
      backward: this.analyzeBackwardCompatibility(oldVersion, newVersion),
      forward: this.analyzeForwardCompatibility(oldVersion, newVersion),
      nodeCompatibility: this.analyzeNodeCompatibility(oldVersion, newVersion),
      apiCompatibility: this.analyzeApiCompatibility(oldVersion, newVersion)
    };
  }
  
  private analyzeBackwardCompatibility(
    oldVersion: WorkflowVersion,
    newVersion: WorkflowVersion
  ): CompatibilityLevel {
    // Check if new version can handle old version's data/configurations
    const changes = this.detectChanges(oldVersion.definition, newVersion.definition);
    
    // Breaking changes indicate incompatibility
    const hasBreakingChanges = changes.some(change => change.impact === 'breaking');
    if (hasBreakingChanges) {
      return CompatibilityLevel.INCOMPATIBLE;
    }
    
    // Check for removed features
    const hasRemovedFeatures = changes.some(change => change.type === 'removed');
    if (hasRemovedFeatures) {
      return CompatibilityLevel.PARTIALLY_COMPATIBLE;
    }
    
    return CompatibilityLevel.COMPATIBLE;
  }
}

Migration Strategies

Data Migration

interface DataMigration {
  id: string;
  fromVersion: SemanticVersion;
  toVersion: SemanticVersion;
  migrations: MigrationStep[];
  rollbackSteps: MigrationStep[];
}

interface MigrationStep {
  type: 'schema' | 'data' | 'configuration';
  description: string;
  operation: MigrationOperation;
  validation: ValidationRule[];
  rollback: MigrationOperation;
}

class DataMigrator {
  async migrateWorkflowData(
    workflowId: string,
    fromVersion: SemanticVersion,
    toVersion: SemanticVersion
  ): Promise<MigrationResult> {
    const migration = await this.getMigrationPlan(fromVersion, toVersion);
    if (!migration) {
      throw new Error(`No migration path found from ${fromVersion} to ${toVersion}`);
    }
    
    // Create backup
    const backup = await this.createDataBackup(workflowId);
    
    try {
      // Execute migration steps
      for (const step of migration.migrations) {
        await this.executeMigrationStep(workflowId, step);
        
        // Validate step
        const validation = await this.validateMigrationStep(workflowId, step);
        if (!validation.isValid) {
          throw new MigrationError(step, validation.errors);
        }
      }
      
      return { status: 'success', backup };
      
    } catch (error) {
      // Rollback on failure
      await this.rollbackMigration(workflowId, migration, backup);
      throw error;
    }
  }
}

Configuration Migration

interface ConfigurationMigration {
  nodeConfigMigrations: Map<string, NodeConfigMigration>;
  workflowConfigMigrations: WorkflowConfigMigration[];
  environmentConfigMigrations: EnvironmentConfigMigration[];
}

interface NodeConfigMigration {
  nodeType: string;
  fromVersion: string;
  toVersion: string;
  transform: (oldConfig: any) => any;
  validate: (newConfig: any) => ValidationResult;
}

class ConfigurationMigrator {
  async migrateWorkflowConfiguration(
    workflow: WorkflowDefinition,
    migration: ConfigurationMigration
  ): Promise<WorkflowDefinition> {
    const migratedWorkflow = { ...workflow };
    
    // Migrate node configurations
    for (const node of migratedWorkflow.nodes) {
      const nodeMigration = migration.nodeConfigMigrations.get(node.type);
      if (nodeMigration) {
        node.config = nodeMigration.transform(node.config);
        
        const validation = nodeMigration.validate(node.config);
        if (!validation.isValid) {
          throw new Error(`Node ${node.id} config migration failed: ${validation.errors.join(', ')}`);
        }
      }
    }
    
    // Migrate workflow-level configuration
    for (const workflowMigration of migration.workflowConfigMigrations) {
      migratedWorkflow.config = workflowMigration.transform(migratedWorkflow.config);
    }
    
    return migratedWorkflow;
  }
}

Monitoring and Observability

Deployment Monitoring

interface DeploymentMetrics {
  deploymentId: string;
  version: SemanticVersion;
  environment: string;
  status: DeploymentStatus;
  health: HealthMetrics;
  performance: PerformanceMetrics;
  errors: ErrorMetrics;
  rollbacks: RollbackMetrics;
}

interface HealthMetrics {
  overallHealth: number; // 0-100
  workflowEngineHealth: number;
  databaseHealth: number;
  externalServiceHealth: number;
  lastHealthCheck: Date;
}

class DeploymentMonitor {
  async collectDeploymentMetrics(deploymentId: string): Promise<DeploymentMetrics> {
    const deployment = await this.getDeployment(deploymentId);
    
    return {
      deploymentId,
      version: deployment.version,
      environment: deployment.environment.name,
      status: deployment.status,
      health: await this.collectHealthMetrics(deployment),
      performance: await this.collectPerformanceMetrics(deployment),
      errors: await this.collectErrorMetrics(deployment),
      rollbacks: await this.collectRollbackMetrics(deployment)
    };
  }
  
  private async collectHealthMetrics(deployment: Deployment): Promise<HealthMetrics> {
    const healthChecks = await Promise.all([
      this.checkWorkflowEngineHealth(deployment),
      this.checkDatabaseHealth(deployment),
      this.checkExternalServiceHealth(deployment)
    ]);
    
    return {
      overallHealth: healthChecks.reduce((sum, check) => sum + check.score, 0) / healthChecks.length,
      workflowEngineHealth: healthChecks[0].score,
      databaseHealth: healthChecks[1].score,
      externalServiceHealth: healthChecks[2].score,
      lastHealthCheck: new Date()
    };
  }
}

Version Analytics

interface VersionAnalytics {
  versionId: string;
  deploymentCount: number;
  successRate: number;
  averageDeploymentTime: number;
  rollbackRate: number;
  adoptionRate: number;
  performanceImpact: number;
  errorImpact: number;
}

class VersionAnalyzer {
  async generateVersionReport(versionId: string): Promise<VersionReport> {
    const version = await this.getVersion(versionId);
    const deployments = await this.getVersionDeployments(versionId);
    
    const analytics = await this.calculateAnalytics(version, deployments);
    const recommendations = await this.generateRecommendations(analytics);
    
    return {
      version,
      analytics,
      recommendations,
      generatedAt: new Date()
    };
  }
  
  private async calculateAnalytics(
    version: WorkflowVersion,
    deployments: Deployment[]
  ): Promise<VersionAnalytics> {
    const successfulDeployments = deployments.filter(d => d.status === 'success');
    const rollbacks = deployments.filter(d => d.rollbackCount > 0);
    
    return {
      versionId: version.id,
      deploymentCount: deployments.length,
      successRate: successfulDeployments.length / deployments.length,
      averageDeploymentTime: this.calculateAverageDeploymentTime(deployments),
      rollbackRate: rollbacks.length / deployments.length,
      adoptionRate: await this.calculateAdoptionRate(version),
      performanceImpact: await this.calculatePerformanceImpact(version),
      errorImpact: await this.calculateErrorImpact(version)
    };
  }
}

Best Practices

Version Naming and Tagging

// Good version naming examples
const versionExamples = {
  major: '2.0.0', // Breaking changes
  minor: '1.5.0', // New features
  patch: '1.4.3', // Bug fixes
  prerelease: '2.0.0-beta.1', // Pre-release versions
  build: '1.4.3+20240115.abc123' // Build metadata
};

// Semantic tagging
const tagExamples = {
  feature: ['feature/user-authentication', 'enhancement/performance'],
  bugfix: ['bugfix/memory-leak', 'hotfix/critical-error'],
  security: ['security/vulnerability-fix', 'security/encryption-update'],
  performance: ['performance/optimization', 'performance/caching'],
  breaking: ['breaking/api-change', 'breaking/schema-update']
};

Deployment Guidelines

1. Always test in non-production environments first
2. Use gradual rollout strategies for critical workflows
3. Maintain comprehensive monitoring during deployments
4. Have rollback plans ready before deploying
5. Document all changes and deployment procedures

Version Control Best Practices

1. Use meaningful commit messages
2. Tag releases consistently
3. Maintain changelog documentation
4. Review changes before version creation
5. Archive old versions appropriately

Troubleshooting

Common Deployment Issues

interface DeploymentTroubleshooter {
  diagnoseIssue(error: DeploymentError): DiagnosisResult;
  suggestSolution(diagnosis: DiagnosisResult): Solution[];
  executeRecovery(solution: Solution): Promise<RecoveryResult>;
}

// Common issues and solutions
const commonIssues = {
  'version-conflict': {
    description: 'Version conflict detected',
    solutions: [
      'Update dependency versions',
      'Resolve version constraints',
      'Use compatible version ranges'
    ]
  },
  'health-check-failure': {
    description: 'Health check failed during deployment',
    solutions: [
      'Check service connectivity',
      'Verify configuration settings',
      'Review resource allocation'
    ]
  },
  'rollback-failure': {
    description: 'Rollback operation failed',
    solutions: [
      'Manual rollback to last known good version',
      'Restore from backup',
      'Emergency hotfix deployment'
    ]
  }
};

Recovery Procedures

class EmergencyRecovery {
  async executeEmergencyRollback(deploymentId: string): Promise<void> {
    // Stop current deployment
    await this.stopDeployment(deploymentId);
    
    // Identify last stable version
    const lastStableVersion = await this.getLastStableVersion(deploymentId);
    
    // Emergency deployment
    await this.emergencyDeploy(lastStableVersion);
    
    // Verify system stability
    await this.verifySystemStability();
    
    // Notify stakeholders
    await this.notifyEmergencyRecovery(deploymentId);
  }
}

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