Shawn Hooper

This plugin generates a list of all the custom page templates available in the active WordPress theme, and shows you how many pages use this template. 
It will also show you if the page contains any Gutenberg blocks or not.
You can also click on the count to access the list of pages that use a specific template.

Page Template Usage Info

Shows you which pages are using which templates, and whether or they are built with Gutenberg or not.

sami

Get notifications on your selected Slack channel once your WP site throws an errors. Choose which levels of errors you’d like to receive.

Error Notify Slack

Receive Slack notifications whenever errors occurs on your site.

Page Template Usage Info vs Error Notify Slack