Monitoring Platform

Sentry

Overview

Sentry is a platform specialized in real-time error tracking and application performance monitoring. It supports application quality improvement through detailed error aggregation and analysis, boasting top-class accuracy and detail in the error monitoring field. It gains high developer support with features directly linked to development team productivity improvement.

Details

Sentry is designed as a specialized platform for error tracking and performance monitoring, following the philosophy of "doing one thing extremely well" with precision and depth.

Key Features

• Real-time Error Tracking: Detailed stack traces and contextual information
• Performance Monitoring: Transaction tracking and performance analysis
• Release Monitoring: Deployment tracking and release quality analysis
• Issue Alerting: Smart alerting with noise reduction
• Source Map Support: Detailed JavaScript error analysis
• Integrations: Rich integrations with Slack, GitHub, Jira, and more
• Team Collaboration: Error assignment and resolution workflows

Technical Features

• Multi-language Support: Support for 30+ programming languages and frameworks
• Session Replay: Complete reproduction of user sessions
• Real-time Notifications: Immediate alerts when errors occur
• Detailed Context: Collection of user, device, and environment information
• High-precision Filtering: Meaningful alerts with minimal noise

Pros and Cons

Pros

• Industry-leading accuracy and detail in error monitoring
• Developer-friendly intuitive interface
• Comprehensive free tier suitable for small projects
• Very easy setup process
• Rich language and framework support
• Powerful debugging features and contextual information
• Open source version available

Cons

• Limited infrastructure monitoring capabilities
• Weaker log management compared to comprehensive platforms
• Cost escalation in large-scale environments
• Requires separate tools for non-error metrics collection
• Limited custom dashboard functionality

References

• Sentry Official Site
• Sentry Documentation
• Sentry GitHub
• Sentry Integrations

Setup and Monitoring Examples

Basic Setup

// Sentry initialization in JavaScript/Node.js
import * as Sentry from "@sentry/node";

Sentry.init({
  dsn: "YOUR_DSN_HERE",
  tracesSampleRate: 1.0, // Performance monitoring
  profilesSampleRate: 1.0, // Profiling
});

Metrics Collection

# Sentry error tracking in Python
import sentry_sdk
from sentry_sdk.integrations.django import DjangoIntegration

sentry_sdk.init(
    dsn="YOUR_DSN_HERE",
    integrations=[DjangoIntegration()],
    traces_sample_rate=1.0,
    send_default_pii=True,
)

# Send custom errors
try:
    risky_operation()
except Exception as e:
    sentry_sdk.capture_exception(e)

# Send custom messages
sentry_sdk.capture_message("Something went wrong", level="error")

Alerting Configuration

// Add detailed context when errors occur
Sentry.configureScope((scope) => {
  scope.setUser({
    id: "12345",
    email: "[email protected]",
    username: "user123"
  });
  
  scope.setContext("payment", {
    amount: 100.0,
    currency: "USD",
    payment_method: "credit_card"
  });
  
  scope.setTag("environment", "production");
  scope.setLevel("error");
});

Dashboard Creation

// Performance monitoring setup
Sentry.startSpan({
  op: "http.request",
  name: "API Call"
}, () => {
  // API call
  return fetch('/api/data')
    .then(response => response.json())
    .catch(error => {
      Sentry.captureException(error);
      throw error;
    });
});

// Manual transaction creation
const transaction = Sentry.startTransaction({
  name: "User Checkout Process",
  op: "transaction",
});

Sentry.getCurrentHub().configureScope(scope => scope.setSpan(transaction));

try {
  await processCheckout();
  transaction.setStatus("ok");
} catch (error) {
  transaction.setStatus("internal_error");
  Sentry.captureException(error);
} finally {
  transaction.finish();
}

Log Analysis

# Sentry integration with Django
# settings.py
import sentry_sdk
from sentry_sdk.integrations.django import DjangoIntegration
from sentry_sdk.integrations.logging import LoggingIntegration

# Logging integration setup
sentry_logging = LoggingIntegration(
    level=logging.INFO,        # Capture INFO and above
    event_level=logging.ERROR  # Send ERROR as events
)

sentry_sdk.init(
    dsn="YOUR_DSN_HERE",
    integrations=[
        DjangoIntegration(),
        sentry_logging,
    ],
    traces_sample_rate=1.0,
)

Integration Setup

// Sentry setup for React applications
import React from "react";
import * as Sentry from "@sentry/react";
import { BrowserRouter } from "react-router-dom";

Sentry.init({
  dsn: "YOUR_DSN_HERE",
  integrations: [
    new Sentry.BrowserTracing({
      routingInstrumentation: Sentry.reactRouterV6Instrumentation(
        React.useEffect,
        useLocation,
        useNavigationType,
        createRoutesFromChildren,
        matchRoutes,
      ),
    }),
  ],
  tracesSampleRate: 1.0,
});

// Sentry-wrapped component
const SentryRoutes = Sentry.withSentryRouting(Routes);

function App() {
  return (
    <BrowserRouter>
      <SentryRoutes>
        {/* Route definitions */}
      </SentryRoutes>
    </BrowserRouter>
  );
}

Error Analysis

// Detailed error analysis and filtering
Sentry.init({
  dsn: "YOUR_DSN_HERE",
  beforeSend(event, hint) {
    // Don't send errors from development environment
    if (event.environment === 'development') {
      return null;
    }
    
    // Filter specific errors
    if (event.exception) {
      const error = hint.originalException;
      if (error && error.message.includes('Script error')) {
        return null;
      }
    }
    
    return event;
  },
  
  // Exclude uptime bot errors
  beforeSend(event) {
    const userAgent = event.request?.headers?.["user-agent"];
    if (userAgent && userAgent.includes("SentryUptimeBot")) {
      return null;
    }
    return event;
  }
});