Heroku Blog
- News
- Last Updated: November 14, 2025
- Michelle Peot
Beginning on October 20th, 2025 07:06 UTC, multiple Heroku services were initially impacted by a database service disruption with our cloud infrastructure provider in the Virginia region. This affected the monitoring, provisioning, networking and availability of cloud infrastructure services that power the Heroku platform.
This outage was a complex, multi-phased event primarily triggered by multiple upstream outages within the cloud infrastructure provider Virginia region, and compounded by Heroku's single-region control plane architecture and automation failures. The service disruptions can be divided into two distinct phases based on root causes, timeline, and impacts.
- Engineering
- Last Updated: November 11, 2025
- Rune Soerensen
It’s that time of year for .NET when we get a new major version and a bunch of exciting features. .NET Conf 2025 kicked off earlier today, bringing with it the release of .NET 10 , as well as ASP.NET Core 10, C# 14, and F# 10. Congrats (and a big thank you) to the .NET team and everyone who helped get .NET 10 out the door.
At Heroku, we believe you should be able to use language and framework releases when they launch, and we prepare accordingly. You can now build and run .NET 10 apps on Heroku , with…
- Engineering
- Last Updated: November 05, 2025
- Richard Schneeman, Chap Ambrose
Puma 7 is here, and that means your Ruby app is now keep-alive ready. This bug , which existed in Puma for years, caused one out of every 10 requests to take 10x longer by unfairly “cutting in line.” In this post, I’ll cover how web servers work, what caused this bad behavior in Puma, and how it was fixed in Puma 7; specifically an architectural change recommended by MSP-Greg that was needed to address the issue.
- Engineering
- Last Updated: November 05, 2025
- Sudarshan Hiray
Modern businesses don’t just run on Salesforce—they run on entire ecosystems of applications. At Heroku, we operate dozens of services alongside our Salesforce instance such as billing systems, user management platforms, analytics engines, and support tools. Traditional approaches to unifying this data create more problems than they solve.
In this article, we’ll see how we unified Salesforce and multi-app data into a real-time analytics platform that processes over 10 TB data monthly with 99.99% uptime. We’ve built a data warehouse architecture that eliminates ETL complexity while delivering real-time insights across our entire technology stack. Here’s how we did it and why…
- Engineering
- Last Updated: November 04, 2025
- Richard Schneeman, Chap Ambrose
The Performance Penalty of Repeated Connections
Before the latest improvements to the Heroku Router, every connection between the router and your application dyno risked incurring the latency penalty of a TCP slow start . To understand why this is a performance bottleneck for modern web applications, we must look at the fundamentals of the Transmission Control Protocol (TCP) and its history with HTTP.
Maybe you’ve heard of a keep-alive connection, but haven’t thought much about what it is or why they exist. In this post, we’re going to peel away some networking abstractions in order to explain what a keep-alive…
- Engineering, News
- Last Updated: October 30, 2025
- Vivek Viswanathan
Imagine this: Your sales team is about to close a major deal. They’re building a custom quote in your app, but they need to see the latest product line items from an Opportunity in Salesforce. They refresh. And wait. The data is stale. The quote gets generated, but it’s missing the latest addition to the deal since your data didn’t sync yet.
This isn’t a hypothetical problem. It’s a frustrating reality for developers who have been limited by legacy data synchronization technology. You’ve told us you need faster, more comprehensive data sync, particularly Accelerated Polling support for crucial but unsupported objects…
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