Drupal 8.x

I'm on Drupal 7. Anyone know if this is "solved" in Drupal 8?

I often need to add text to forms to explain why this form should be used, how it works and other stuff. This information doesn't belong to any specific field and is usually placed at the top of the form.

I have a few tens of these texts and they are added in code inside hook_form_alter or render_alter etc.

This irks me in several ways:

In view under the muliple values settings it says:

If checked, multiple values for this field will be shown in the same row. If not checked, each value in this field will create a new row. If using group by, please make sure to group by "Entity ID" for this setting to have any effect.

Does anyone know where to find this setting?

Here is my page:
http://dev-swedishmuseum.pantheonsite.io/events

I have a grouping field that pulls in the date and is formatted to just display the month. BUT, of course, the data for the full date is still there, so it groups by specific date, not month. Is there some way to rewrite the output to change the granularity?

I would like to avoid twig template work, but if that's the answer any tips are welcome !

Hi. We are setting up two Drupal servers behind a load balancer with only one being active at once. When one of the servers goes down, the second will take over and become the active server until it goes down and vice-versa. So, server1 & server2 will run Drupal 8.3.7. How do we sync content and configuration between the two servers, taking into consideration that the master-slave relationship might change? Users will edit content on the master ("live") server and changes should automatically be sync'ed to the slave.

I apparently need to make sure that my PHP has OPcode on in order to clear cache. I have looked everywhere and cannot understand the many different things I have found to fix this. I have NO idea what to do, am not thinking about compiling my PHP, which I don't know how to do. In Drupal 7, this was so easy. Not at all sure why it became so hard in Drupal 8.

I have implemented simplesamlphp on our site. After the user has been authenticated from Shibboleth and returns back to Drupal, it redirect to mysite.mainsite.com:80 and the page said, "This page can't be displayed". I don't think it's simpelsamlphp_auth because it is working fine authenticating. Any suggestion in troubleshooting this thing is much appreciated.