Upgrade to Nextcloud 28
System requirements
PHP 8.3 is now supported, but 8.2 is recommended.
Web server configuration
The recommended nginx configuration changed as Nextcloud Talk now serves audio files with
.ogg/.flacextension, make sure to add these extensions to the list of static files.
Monitoring
Beginning with Nextcloud 28, the monitoring endpoint no longer provides information about available app updates, as gathering the data always involves at least one external request to apps.nextcloud.com.
You can still ask the monitoring endpoint to show new app updates by using the URL parameter skipApps=false. However, please do not check this endpoint too often.
Previews for Office files using LibreOffice
Nextcloud can generate previews for Office files using LibreOffice.
Since Nextcloud 28, you can also create previews for EMF files.
To enable it, add 'OC\Preview\EMF' to enabledPreviewProviders.
Until Nextcloud 28, the same LibreOffice user profile was used to generate the previews. LibreOffice can only be invoked once per user profile, so the generation of a preview for an office file would fail if another one were created right now.
Beginning with Nextcloud 28, a different LibreOffice user profile is used for each file. Downside: If you upload 100 emf files, you may end up with 100 LibreOffice
invocations. Though, you can use preview_concurrency_new and preview_concurrency_all to limit the number of previews that can be generated concurrently when php-sysvsem is available.
The configuration option preview_office_cl_parameters was removed with Nextcloud 28.
We expect LibreOffice to be started with the given parameters, so it’s unfavorable to have a configuration option to change the parameters.
Please reach out to us via https://github.com/nextcloud/server/pull/41395 if that’s causing any trouble for you.
Tip
Previews for EMF files can be enabled without a local LibreOffice installation if you are already using Nextcloud Office / Collabora. Make sure you have Nextcloud Office 8.3.0 installed and add 'OCA\Richdocuments\Preview\EMF' to enabledPreviewProviders.