How to Monitor Signup, Email Verification, and Password Reset Flows

# Flask
@app.route('/health/email-flows')
def email_flows_health():
    checks = {}

    # 1. Check email queue depth
    queue_depth = get_queue_size('emails')
    checks['email_queue_depth'] = queue_depth
    checks['email_queue_status'] = 'ok' if queue_depth < 500 else 'degraded'

    # 2. Check email provider connectivity
    try:
        import sendgrid
        sg = sendgrid.SendGridAPIClient(api_key=os.environ['SENDGRID_API_KEY'])
        # Lightweight API check — don't send email, just verify credentials
        response = sg.client.scopes.get()
        checks['email_provider'] = 'ok'
    except Exception as e:
        checks['email_provider'] = f'error: {str(e)}'

    # 3. Check database can write new user records
    try:
        # Test write capability without creating real records
        db.execute('SELECT COUNT(*) FROM users')
        checks['user_db'] = 'ok'
    except Exception as e:
        checks['user_db'] = f'error: {str(e)}'

    status = 'ok' if all(v == 'ok' for v in [
        checks['email_queue_status'],
        checks['email_provider'],
        checks['user_db']
    ]) else 'degraded'

    return jsonify({'status': status, **checks}), 200 if status == 'ok' else 503

// Node.js
app.get('/health/email-flows', async (req, res) => {
    const checks = {};

    try {
        // Check email queue depth
        const emailQueue = new Queue('emails', { connection });
        const counts = await emailQueue.getJobCounts('waiting', 'delayed');
        const depth = counts.waiting + counts.delayed;
        checks.emailQueueDepth = depth;
        checks.emailQueue = depth < 500 ? 'ok' : 'degraded';

        // Check SMTP/provider connectivity
        await transporter.verify();
        checks.emailProvider = 'ok';

        // Check DB write access
        await db.query('SELECT COUNT(*) FROM users');
        checks.userDb = 'ok';

        const allOk = Object.values(checks).every(v => v === 'ok' || typeof v === 'number');
        res.status(allOk ? 200 : 503).json({ status: allOk ? 'ok' : 'degraded', ...checks });
    } catch (err) {
        res.status(503).json({ status: 'error', error: err.message, ...checks });
    }
});

@app.route('/health/password-reset')
def password_reset_health():
    try:
        # Check reset token store is accessible
        reset_token_key = 'health:test-reset-token'
        cache.set(reset_token_key, 'test', ex=60)
        val = cache.get(reset_token_key)
        assert val is not None

        # Check email queue isn't backed up beyond token TTL risk
        queue_depth = get_queue_size('emails')
        queue_ok = queue_depth < 200  # Conservative — don't want delays > ~5 minutes

        return jsonify({
            'status': 'ok' if queue_ok else 'degraded',
            'token_store': 'ok',
            'email_queue_depth': queue_depth,
        }), 200 if queue_ok else 503
    except Exception as e:
        return jsonify({'status': 'error', 'error': str(e)}), 503