Fix your actual slow-loading assets with Resource Monitoring

Slow-loading assets on your web pages can lead to frustrated users, high bounce rates, and lost conversions. For the vast majority of websites, slow-loading res...

Leveraging our new User Feedback widget to improve our Performance product

While Sentry can automatically detect unhandled exceptions, poor performance, and even signals of user frustration such as rage clicks, there are some problems ...

Fetch Waterfall in React

Have you seen this problem? Or maybe this one? You’ve most likely seen this: export const Component = () => { const [data, setData] = useState() const [load...

Sentry Bundle Size: How We Reduced Replay SDK by 35%

Bundle Size matters - this is something we SDK engineers at Sentry are acutely aware of. In an ideal world, you'd get all the functionality you want with no add...

Fallbacks for HTTP 404 images in HTML and JavaScript

Your images are 404ing all over the place. You’ve got an angry email from a client. Their site is “broken”, images aren’t loading, cumulative layout shift is ru...

November product updates for Sentry

Grab your favorite mug, fill it with some warm chocolatey goodness – it is hot cocoa season after all –, and check out our most recent product updates to Sentry...

Spotlight: Sentry for Development

A long time ago I worked on a project called Django Debug Toolbar (DJDT). It was a local development plugin that would give you a debug overlay within Django’s ...

Fixing memoization-breaking re-renders in React

React’s component-based approach to building web applications allows us to break up our web apps into smaller components that we can easily reuse. When a compon...

Introducing the Functional Source License: Freedom without Free-riding

Sentry started life in 2008 as an unlicensed, 71-line Django plugin. The next year we began publishing it under BSD-3, and ten years later we switched to the Bu...

SDK & Integration Updates: Sentry for every platform, framework, and tool

It seems like these days there’s a new exciting framework or dev tool launched every week. The challenge is that even if you’re ready and able to use new produc...

Sentry’s EU Data Region Now in Early Access

Like many of our customers, Sentry takes privacy and data sovereignty seriously. One of Sentry’s values is to be for “Every Developer,” and we can’t do that wit...

Not Every Problem is an Error: Introducing Rage and Dead Clicks + New User Feedback Reports

I know, we’re Sentry the error and performance monitoring platform and we catch production issues. But as you (hopefully) saw during our Launch Week announcemen...

Performance Monitoring for Every Developer: Web Vitals & Function Regression Issues

Extracting relevant insights from your performance monitoring tool can be frustrating. You often get back more data than you need, making it difficult to connec...

A story about HTTP status codes and why you should read documentation

Since 2020, I’ve been working on an Express (Node.js framework) application to power viewer interactions and events that happen whilst I’m streaming live coding...

Next.js SDK Security Advisory - CVE-2023-46729

TL;DR We released a critical security advisory today for Sentry’s Next.js SDK. In the SDK versions 7.26.0-7.76.0 (inclusive), when the tunnelRoute option is ena...

Improved GraphQL Support in Sentry

Beautiful syntax-highlighted GraphQL errors are coming — get ‘em while they’re fresh! Not that we encourage you to add more errors of any kind to your code. But...

October Product Updates for Sentry

Hey, you. Yes, you. Do you want to fix broken code faster and easier? Of course, you do. Who doesn’t? Well, lucky for you, we dedicated the whole month of Octob...

We Just Gave $500,000 to Open Source Maintainers

Want to hear more? Register for “The Future of Open Source: The State of Sustainability”, on October 26. Sentry is an Open Source-aligned company, and our missi...

September Product Updates for Sentry

It’s official, summer is over. So grab yourself a pumpkin-spiced food item of choice and check out what the Sentry team has been up to this past month. From int...

How to identify and fix Render-Blocking Resources

Render-blocking resources are JavaScript and CSS files that prevent the web page from loading until they are downloaded. These might be critical resources that ...

Intern Gino develops the Kotlin Multiplatform SDK

Gino, a student at the Vienna University of Technology, spent the summer of 2023 as a software engineer intern with the Mobile SDK team. We asked him to share a...

Intern Michelle integrates Sentry with Opsgenie

Michelle Fu, a student at Stanford University, spent the summer of 2023 as a software engineer intern with the Sentry Enterprise team. We asked her to share a l...

Intern Nikki helps developers find performance trends

Nikki Kapadia, a student at Toronto Metropolitan University, spent the summer of 2023 as a software engineer intern with the Sentry Performance team. We asked h...

Intern Ryan helps Sentry find and fix customer pain points

Ryan Suh, a student at Stanford University, spent the summer of 2023 as a product marketing intern with the Sentry Marketing team. We asked him to share a littl...

Intern Spencer gives you Issue alerts in Discord

Spencer, a student at the University of Toronto, spent the summer of 2023 as a software engineer intern with the Sentry Issues team. We asked him to share a lit...

Intern Lucas makes it easier to hire at Sentry

Lucas Hatae, a student at Cal Poly San Luis Obispo, spent the summer of 2023 as a BizOps intern with the Sentry BizOps team. We asked him to share a little abou...

Intern Jack improves the Kubernetes agent for Sentry Crons

Jack Zhang, a student at Dartmouth College, spent the summer of 2023 as a software engineer intern with the Sentry Dev Infra team. We asked him to share a littl...

Intern David enables queries against production data

David Tsukernik, a student at the University of Toronto, spent the summer of 2023 as a software engineer intern with the Sentry Search and Storage team. We aske...

Intern Chloe improves Sentry integration health

Chloe Ho, a student at Bernard College, spent the summer of 2023 as a software engineer intern with the Sentry Issues team. We asked her to share a little about...

Flutter Debugging: Top Tips and Tools You Need to Know

Modern applications are complex, interconnected collections of services and moving parts that all have the potential to fail or not work as expected. Flutter an...

Find slow database queries with Query Insights

There’s only so much you can control when it comes to your app’s performance. But you control what is arguably most important - the code. Sentry Performance get...

From LCP to CLS: Improve your Core Web Vitals with Image Loading Best Practices

If you’re a front end developer, there’s a high probability you’ve built (or will build) an image-heavy page. And you’ll need to make it look great by serving h...

Find Trending Problems Faster with Escalating Issues

Knowing what issues to hit the snooze button on, or drop everything and push a hotfix for is a common developer dilemma. Similarly to what was discussed in Slee...

Fly.io with Sentry

When developers build and deploy their apps, understanding what's slow or broken in production is more a necessity than a convenience. With Sentry, developers a...

Choosing the Right Metric: A Guide to Percentiles and Averages

Not sure which performance metric to use to measure your application performance? Don't worry – you're not alone. With a wide variety of options, the task of ch...

Sentry's Open Source Values

This is the 25th year of the Open Source movement, and as with any social enterprise there is a constant effort to maintain and at times renegotiate the meaning...

The Best and Worst Reasons to Adopt OpenTelemetry

It was a rainy day in Seattle at KubeCon + CloudNativeCon North America in December 2018 when I first encountered the term ‘OpenTelemetry.’ At that time, I was ...

August Product Updates for Sentry

During the month of August we dropped heaps of new features across the entire Sentry platform. From identifying user frustration through rage and dead clicks to...

Making your JavaScript projects less noisy

If you're using Sentry for JavaScript error monitoring, you may be familiar with a common challenge: sifting through noisy, low-value errors that hinder identif...

Introducing Rage & Dead Click Detection for Session Replay

Sentry developers work ridiculously hard to make sure that every update makes the developer experience better. And, just like you, we use Sentry to monitor…Sent...

Sentry Profiling now supports Browser Javascript, React Native, and Ruby

Profiling is an essential component of a developer’s toolkit for identifying and addressing the thorniest performance bottlenecks. Whether you’re a backend dev...

Let's Talk About Open Source

Yesterday we announced that Codecov is now “Open Source”, and we messed up in two ways: We wrongly used the term Open Source; while unintentional, we should hav...

July Product Updates for Sentry

During the past month of July, the Sentry dev team dropped new capabilities to help you better understand, prioritize, and respond to errors and performance pro...

Harnessing Distributed Tracing for Application Performance Optimization

Distributed tracing is a powerful technique that allows you to track the flow and timing of requests as they navigate through a system. By linking operations an...

5 Signs You Have Outgrown Your Mobile Monitoring Solution

Imagine you start a new hobby -- let's say bike riding. You don't want to invest a lot in a bike because you're not sure that you'll like it. Luckily, you snag ...

June Product Updates for Sentry

Get ready for another round of new releases that will help take your performance and error troubleshooting to the next level. Over the past month of June, we've...

Detecting Main Thread Issues in Mobile Applications

Mobile device users care about three things when it comes to good app performance: Smooth UI Long battery life How quickly the app does what they need it to do ...

Mastering mobile: Reflecting on three years of mobile growth

Few areas of development have seen as much recent change as mobile. Mobile phone and app usage spiked during the pandemic as we adapted to life with social dist...

Code Refactoring and why you should refactor your code

Software does not expire, but it “rots”. Its quality degrades over time. As you build your project and add features, you probably won’t always build it in a cle...

Sentry Ingestion Domains Updates

The TL;DR: We are going to apply these changes on September 1st, 2023: Ingestion via non-encrypted HTTP will be disabled. DNS A records for sentry.io and *.sent...

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