Guide to Custom Instrumentation in Phoenix Using AppSignal

This article by Aestimo Kirina offers a detailed tutorial on implementing custom instrumentation in a Phoenix application using AppSignal. The guide walks through the prerequisites needed to follow along, such as having a Phoenix LiveView app with the AppSignal package installed and a basic understanding of Elixir and Phoenix framework. The author explains the concept of custom instrumentation and its necessity for identifying deeper performance issues in a complex Phoenix application. The article goes through two primary methods for custom instrumentation: Function Decorators and Instrumentation Helpers. The author provides Elixir code samples to demonstrate the process step-by-step and shows how custom data can be visualized in the AppSignal dashboard. Additionally, the article covers instrumenting Phoenix channels and LiveViews, highlighting the usage of AppSignal's decorators and instrumentation functions. The post is part of a series on error tracking and custom instrumentation in AppSignal for Phoenix apps.