You probably don't need this but for debugging purposes i checked system.install file and saw how dependencies are checked on drupal updates.
So to get full list of modules and its info run

$files = \Drupal::service('extension.list.module')->getList();

to get theme info go

To find it via drush, run this command 

drush php:eval "echo drupal_get_installed_schema_version('modul_name');"

also if you want to look it up with some DB admin tool, look under table `key_value`,  `system.schema` collection row, with a `name` of your module and you will get value of last run update.

If you want to import DB that is in ZIP format with one line

gunzip -c my_db.sql.gz | drush sqlc

to dump DB to ZIP file write this

drush sql-dump --gzip --result-file=my_db.sql

you will end up with my_db.sql.gz file.

So before we made an setup for rsyslog and some advanced log output that can be read by datadog (or others).

In this post I will show you how to setup monitor, alerting and drupal syslog module. So let's first start with drupal syslog, I usually set this setup for syslog format

Basic setup

So I will assume you installed syslog and have some default config running for it with syslog_facility set to log_local0. With that lets assume you are using rsyslog and you have config for it in

/etc/rsyslog.conf

which could have all config in this file or separated config files that are included with

If you want to add some JS code, like some kind of snippet to your pages with libraries.yml, add it as any other library item but don't use jquery or drupal behaviours in .js code, add some plain JS code like

document.addEventListener("DOMContentLoaded", function() {

so to wrap some JS snippet for it, do it like below.

I wanted to rename lots of filed and folders for my modules, but not to do it manually I made an php script that does this for me. Also I used my IDE to rename code(class names and methods). So just replace root where is the code you want to change file and folder names and do that for strings also.

To output block, you can attach which theme template will output it, which library to attach to it, what markup will be outputed and in the end what tags can be in this markup
 

One thing to take note when using ajax callbacks on filed that can have unlimited number is to use delta in wrapper names.

To set which other entity type should your field reference you can do it with this settings on base field