The ability to record and see everything happening across your web applications is essential when building resilient and highly available systems. All of your events—from application logs to errors to user behavior—contain data that could be useful to you and your team. When you have a central place to access all this information, finding issues and their root causes becomes easier because you have the data at your fingertips.

For many applications, access is usually through a single domain, such as yourapp.com. This way, the application developer is able to offer a unified experience to all users. This works great most of the time, but imagine a situation where you need to give each user a customized experience; how would you achieve this? One of the ways you can customize the user experience in a single application is by using account-based subdomains.

Have you ever found yourself rummaging through the fridge, trying to figure out what groceries you have and what you need to buy? Okay, maybe this isn't a super serious problem, but what better way to manage this chore than by building a web API? In this guide, we'll craft a grocery management API with Go and Gin. If you're new to API lingo, CRUD might sound a bit... well, crude. However, it's a fundamental concept! CRUD stands for create, read, update, and delete.