Matrix server.
To enable this integration, go to Settings > Integrations > Matrix Bot and enter the relevant information.
The recommendation is to create a specific user for the Miniflux integration:
@username:homeserver.tld
, for example: @example:matrix.org
https://matrix.org
!localid:homeserver.tld
, for example: !RXRwLGkDQJzA:matrix.org
.As the time of writing this document, the Matrix notifications looks like this when using the Element client: