The "Easy method" works fine.

I do not have menu links for this class but calls from an action. And also the class calls other siblings in the original namespace. So I adjusted the "use" calls and it works perfect.

Thank you very much RvR for the useful and detailed answer.

I do not have menu links

It was an example only for understating what you can do ;)

:))

Thank you

You can use elgg_get_metadata with 'metadata_calculation'

see https://github.com/Elgg/Elgg/blob/7804230a2fd21a1c6d411a4166114c8411786e80/engine/lib/metadata.php#L134-L164

Foe some mysterious reason your answer went to the spam.

Thank you Jerome - I'll check it

Sorry,

My problem was with the menu plugin hook. It is called twice.

False alarm :)

I checked with my host. It is a shared plan, which does not support archive.

 It only supports the following DB engines. 

https://stackoverflow.com/questions/1458122/enabling-archive-engine

https://stackoverflow.com/questions/26996618/install-mariadb-archive-engine

Or use the suggested plugin, and delete the system log archives tables manually from your DB.

Don't forget about this.

Made a ticket for this to handle not having ARCHIVE available a bit more friendly https://github.com/Elgg/Elgg/issues/12905

Copy this file from:

vendor\elgg\elgg\views\default\elgg.js.php

To your custom plugin:

\mod\my_plugin\views\default\elgg.js.php

Comment this:

$elggDir->getPath("js/lib/ui.js"),

Add after:

foreach ($files as $file) {
   readfile($file);
   // putting a new line between the files to address https://github.com/elgg/elgg/issues/3081
   echo "\n";
}

Path to your custom ui.js (e.g. \mod\my_plugin\views\default\lib\ui.js):

readfile(dirname(__FILE__). '/lib/ui.js');
echo "\n";

Clean the caches.

Done.

Works great.

Thank you very much dear RVR