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Articles by Jon Jagger


From Monitoring to Action - Get Faster Incident Response with Change Forensics 🕵️‍♀️

In this post you’ll learn how Kosli’s Change Forensics gives DevOps, Platform, and Site Reliability Engineers the ability to rapidly pinpoint and understand changes and events in their infrastructure …

How to run your Python Flask server inside a readonly Docker container

In a previous blog we showed you how to strangle old code using Python decorators. This 5 minute blog post shows you how to run a Python Flask server in a readonly Docker container. The steps are …

How to strangle old code using Python decorators

The Strangler Pattern is a pattern for safely and carefully retiring old code. The idea is simple - you run the old code and new code live, in production, side-by-side, checking that the new code …

Get Python test coverage faster without killing your server

Getting system test coverage from a Python web server is not straightforward. If you search the internet all the hits describe killing the server (eg gunicorn) to get the coverage exit handlers to …