Error Tracking

Sentry Integration Skill

Purpose

This skill enforces comprehensive Sentry error tracking and performance monitoring across all services following Sentry v8 patterns.

When to Use This Skill

• Adding error handling to any code
• Creating new controllers or routes
• Instrumenting cron jobs
• Tracking database performance
• Adding performance spans
• Handling workflow errors

🚨 CRITICAL RULE

ALL ERRORS MUST BE CAPTURED TO SENTRY - No exceptions. Never use console.error alone.

Current Status

Example: API Service ✅ Complete

• Sentry v8 fully integrated
• All workflow errors tracked
• Background job processors instrumented
• Test endpoints available

Sentry Integration Patterns

1. Controller Error Handling

// ✅ CORRECT - Use BaseController
import { BaseController } from '../controllers/BaseController';

export class MyController extends BaseController {
    async myMethod() {
        try {
            // ... your code
        } catch (error) {
            this.handleError(error, 'myMethod'); // Automatically sends to Sentry
        }
    }
}

2. Route Error Handling (Without BaseController)

import * as Sentry from '@sentry/node';

router.get('/route', async (req, res) => {
    try {
        // ... your code
    } catch (error) {
        Sentry.captureException(error, {
            tags: { route: '/route', method: 'GET' },
            extra: { userId: req.user?.id }
        });
        res.status(500).json({ error: 'Internal server error' });
    }
});

3. Workflow Error Handling

Example of a domain-specific Sentry helper from the original production project. If you build a helper like this for your domain, the call site looks like:

import { WorkflowSentryHelper } from '../workflow/utils/sentryHelper';

WorkflowSentryHelper.captureWorkflowError(error, {
    workflowCode: 'INVOICE_APPROVAL',
    instanceId: 123,
    stepId: 456,
    userId: 'user-123',
    operation: 'stepCompletion',
    metadata: { additionalInfo: 'value' }
});

Without a helper, plain Sentry works everywhere:

Sentry.captureException(error, {
    tags: { operation: 'stepCompletion' },
    extra: { workflowCode: 'INVOICE_APPROVAL', instanceId: 123, userId: 'user-123' }
});

4. Cron Jobs (MANDATORY Pattern)

#!/usr/bin/env node
// FIRST LINE after shebang - CRITICAL!
import '../instrument';
import * as Sentry from '@sentry/node';

async function main() {
    return await Sentry.startSpan({
        name: 'cron.job-name',
        op: 'cron',
        attributes: {
            'cron.job': 'job-name',
            'cron.startTime': new Date().toISOString(),
        }
    }, async () => {
        try {
            // Your cron job logic
        } catch (error) {
            Sentry.captureException(error, {
                tags: {
                    'cron.job': 'job-name',
                    'error.type': 'execution_error'
                }
            });
            console.error('[Job] Error:', error);
            process.exit(1);
        }
    });
}

main()
    .then(() => {
        console.log('[Job] Completed successfully');
        process.exit(0);
    })
    .catch((error) => {
        console.error('[Job] Fatal error:', error);
        process.exit(1);
    });

5. Database Performance Monitoring

Example from the original production project - a small helper that wraps DB calls in Sentry spans. Adapt to your codebase:

import { DatabasePerformanceMonitor } from '../utils/databasePerformance';

const result = await DatabasePerformanceMonitor.withPerformanceTracking(
    'findMany',
    'UserProfile',
    async () => {
        return await PrismaService.main.userProfile.findMany({
            take: 5,
        });
    }
);

The universally-available equivalent is a direct Sentry span:

const result = await Sentry.startSpan({
    name: 'db.userProfile.findMany',
    op: 'db.query',
    attributes: { 'db.model': 'UserProfile', 'db.operation': 'findMany' }
}, async () => {
    return await prisma.userProfile.findMany({ take: 5 });
});

6. Async Operations with Spans

import * as Sentry from '@sentry/node';

const result = await Sentry.startSpan({
    name: 'operation.name',
    op: 'operation.type',
    attributes: {
        'custom.attribute': 'value'
    }
}, async () => {
    // Your async operation
    return await someAsyncOperation();
});

Error Levels

Use appropriate severity levels:

• fatal: System is unusable (database down, critical service failure)
• error: Operation failed, needs immediate attention
• warning: Recoverable issues, degraded performance
• info: Informational messages, successful operations
• debug: Detailed debugging information (dev only)

Required Context

import * as Sentry from '@sentry/node';

Sentry.withScope((scope) => {
    // ALWAYS include these if available
    scope.setUser({ id: userId });
    scope.setTag('service', 'api'); // your service name
    scope.setTag('environment', process.env.NODE_ENV);

    // Add operation-specific context
    scope.setContext('operation', {
        type: 'workflow.start',
        workflowCode: 'INVOICE_APPROVAL',
        entityId: 123
    });

    Sentry.captureException(error);
});

Service Integration Examples

API Service (Example)

Location: ./api/src/instrument.ts

import * as Sentry from '@sentry/node';
import { nodeProfilingIntegration } from '@sentry/profiling-node';

Sentry.init({
    dsn: process.env.SENTRY_DSN,
    environment: process.env.NODE_ENV || 'development',
    integrations: [
        nodeProfilingIntegration(),
    ],
    tracesSampleRate: 0.1,
    profilesSampleRate: 0.1,
});

Key Helpers:

• Custom Sentry helpers for domain-specific errors
• DatabasePerformanceMonitor - DB query tracking
• BaseController - Controller error handling

Notifications Service (Example)

Location: ./notifications/src/instrument.ts

import * as Sentry from '@sentry/node';
import { nodeProfilingIntegration } from '@sentry/profiling-node';

Sentry.init({
    dsn: process.env.SENTRY_DSN,
    environment: process.env.NODE_ENV || 'development',
    integrations: [
        nodeProfilingIntegration(),
    ],
    tracesSampleRate: 0.1,
    profilesSampleRate: 0.1,
});

Key Helpers:

• Service-specific Sentry helpers for domain errors
• BaseController - Controller error handling

Configuration (config.ini)

[sentry]
dsn = your-sentry-dsn
environment = development
tracesSampleRate = 0.1
profilesSampleRate = 0.1

[databaseMonitoring]
enableDbTracing = true
slowQueryThreshold = 100
logDbQueries = false
dbErrorCapture = true
enableN1Detection = true

Testing Sentry Integration

Example Test Endpoints

# Test basic error capture
curl http://localhost:3000/api/sentry/test-error

# Test performance tracking
curl http://localhost:3000/api/sentry/test-performance

# Test database performance
curl http://localhost:3000/api/sentry/test-database-performance

Create test endpoints in your services to verify Sentry integration works end-to-end.

Performance Monitoring

Requirements

1. All API endpoints must have transaction tracking
2. Database queries > 100ms are automatically flagged
3. N+1 queries are detected and reported
4. Cron jobs must track execution time

Transaction Tracking

import * as Sentry from '@sentry/node';

// Automatic transaction tracking for Express routes
app.use(Sentry.Handlers.requestHandler());
app.use(Sentry.Handlers.tracingHandler());

// Manual transaction for custom operations
const transaction = Sentry.startTransaction({
    op: 'operation.type',
    name: 'Operation Name',
});

try {
    // Your operation
} finally {
    transaction.finish();
}

Common Mistakes to Avoid

❌ NEVER use console.error without Sentry ❌ NEVER swallow errors silently ❌ NEVER expose sensitive data in error context ❌ NEVER use generic error messages without context ❌ NEVER skip error handling in async operations ❌ NEVER forget to import instrument.ts as first line in cron jobs

Implementation Checklist

When adding Sentry to new code:

• Imported Sentry or appropriate helper
• All try/catch blocks capture to Sentry
• Added meaningful context to errors
• Used appropriate error level
• No sensitive data in error messages
• Added performance tracking for slow operations
• Tested error handling paths
• For cron jobs: instrument.ts imported first

Key Files (Typical Structure)

Per Service

• src/instrument.ts - Sentry initialization (imported first)
• src/utils/sentryHelper.ts - Domain-specific error helpers
• src/utils/databasePerformance.ts - DB monitoring
• src/controllers/BaseController.ts - Controller base with Sentry

Configuration

• config.ini or .env - Sentry DSN and settings
• sentry.ini - Shared Sentry config (optional)