We've released version 4.0 of the AppSignal gem, which offers significant changes and improvements to our Ruby integration. In this blog post, we'll cover the core updates and explain the steps you need to take before you upgrade.

In the first part of this series, we saw that even if you just use AppSignal’s default application monitoring, you can get a lot of information about how your Phoenix application is running. Even so, there are many ways in which a Phoenix application may exhibit performance issues, such as slow database queries, poorly engineered LiveView components, views that are too heavy, or non-optimized assets.