As of now, feature with 178 votes is available in Plesk Onyx 17.9 Preview only: https://plesk.uservoice.com/forums/184549-feature-suggestions/suggestions/17924536-fail2ban-now-supports-ipv6-please-upgrade

It would be awesome to have this feature available on earlier versions of Plesk Onyx without the necessity to wait until Plesk Onyx 17.9 becomes stable.

Add ability to disable Wildcard certificate option in Let's Encrypt

Add mcrypt module to Plesk PHP 7.2 and newer.
For previous PHP versions it's included out of the box.

Mcrypt 1.0.2 natively supports PHP 7.2+ (https://pecl.php.net/package/mcrypt/1.0.2)

It's, for example, required by Prestashop 1.7.x, which is quite popular among Plesk users.

By default the HTTP header 'x-powered-by: PleskLin' is added to HTTP responses.
And with PHP, even the version number is included: 'x-powered-by: PHP/7.3.5'

For security it is better to not give such information, as it may expose you are using outdated software with known vulnerabilities.
Currently it is possible to remove these headers, but it requires some manual actions using SSH (https://support.plesk.com/hc/en-us/articles/115000385274)

My suggestion is to create page to be able to manage such header additions for all websites and services.

Please add a possibility to show both IPv4 and IPv6 on the Plesk Home page inside the System Overview section, if there is a configured IPv6 address on the server.

add HTTP/3

Currently, Plesk Repair Kit extension does monitor in real time the CPU and RAM usage per domain: https://support.plesk.com/hc/en-us/articles/360007784053-Is-it-possible-to-monitor-CPU-Memory-like-in-Health-Monitor-per-domain-subscription-basis-

However, it doesn't register/save and historical usage. It would be really helpful that this extension would keep a CPU and RAM usage history, a graph, a timeline, in order to plan CPU and RAM limits set by CGroups Manager.

Currently, logs about create/Remove Directories or Files are only stored in panel.log with debug enabled. A feature for it will be appreciated in order to avoid enable debug into the server and increase server process.

It's the TOTP implementation so it does not only work with Google Authenticator.
Call it like 2-Factor-Auth (or something similar) instead

PIWIK is death!
Simple Matomo-plug-in installation without additional configuration for the databases or the host

The possibility to setup a replication for MySQL

Please implement Typo3 9.5 support

phpPgAdmin support was dropped starting from Plesk Onyx 17.8
This means that Plesk does not have any management tool for Postgres databases shipped with it.

I suggest to include pgadmin in Plesk installation since the latest ve
rsion of this software (2018-09-06 - pgAdmin 4 v3.3 Released) has just been released, with adequate security. More info about it you can find here:
https://www.pgadmin.org/

Implement http://www.wildfly.org/ instead of deprecated Tomcat

Created according to the comment from this article https://support.plesk.com/hc/en-us/articles/360000322173?page=1#comment_360000633734

According to https://support.plesk.com/hc/en-us/articles/360007305893 , it is required to enable resume uploads on FTP server side, however, it would be nice to have the option to disable resume uploading from Plesk side in case if there is no access to FTP server

Please add Mailman support to Let's Encrypt.

Ideally, one could issue either a certificate directly for lists.domain.com or a wildcard certificate for *.domain.com.

Furthermore, a secure connection should be enforceable.

Thanks!

According to https://support.plesk.com/hc/en-us/articles/115000786914-How-to-enable-SpamAssassin-spam-check-for-forwarded-emails-on-Windows when the option "Apply individual settings to spam filtering" is enabled, filtering of forwarded emails is not performed and additional steps are required.

Please, make it so that no additional steps would be required.

Currently while it is possible to customize notifications body, there is no way to customize email sent when you click on Forgot password button on logging into Plesk. It would be nice to have ability to customize it as well: as I would like to add into this email my branding, images etc.