Debugging

Recently I came across an issue on a site where the setup:db:status would constantly report Declarative Schema is not up to date even after consecutive runs. This was breaking the zero downtime deployment configuration for the store, as the CD process always saw DB updates to process. There seemed to be (at least at the time of writing) very little information / tooling on how to debug db schema issues. So after a bunch of reverse engineering Magento’s implementation of DB Schema, I ended up creating a simple script that compares the current DB schema with the current configuration in the compiled db_schema....

A handful of times I have came across pages where full page caching is broken. Instead of diving through and grepping various XML files to identify what module is breaking the cache. I have wrote a section of code, that will identify any uncacheable blocks on the current page and display them in the bottom left of the page. Currently I just paste this into the theme (usually the header or logo phtml files)....