Notification was not parsed by any notifier [app: text, subject: mentioned]

[SystemKeeper]

Describe the bug
Not really sure if it is a bug, but I noticed this in the log of an instance.
From the error I would assume it happens when someone was mentioned in a text document. But when I manually try it, it works. So not sure what triggers the exception.

Screenshots
If applicable, add screenshots to help explain your problem.

Server details:

• Nextcloud version: 29.0.2
• PHP Version: 8.2
• Database: 10.11.6-MariaDB-1:10.11.6+maria~deb11

Logs

Nextcloud log (data/nextcloud.log)

{
    "reqId": "3CSQVHfB4Gmn2EyGSI46",
    "level": 1,
    "time": "2024-06-10T09:00:26+02:00",
    "remoteAddr": "172.31.2.42",
    "user": "<user>",
    "app": "no app in context",
    "method": "GET",
    "url": "/ocs/v2.php/apps/notifications/api/v2/notifications",
    "message": "Notification was not parsed by any notifier [app: text, subject: mentioned]",
    "userAgent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36",
    "version": "29.0.2.2",
    "data": []
}

[mejo-]

Thanks for the report @SystemKeeper. This is a info level log message and it comes from https://github.com/nextcloud/server/blob/e5a6698ec0125d0183b3e71d27e4d22dae0431bc/lib/private/Notification/Manager.php#L357

Not sure either where this could come from, also given that mentioning in a document works and results in notifications in my tests.

[juliusknorr]

I also could not trigger a debugger breakpoint when sending a notification for a mention. @SystemKeeper Can you maybe share the related entry that was created in your oc_notifications table?

[SystemKeeper]

I was thinking about this morning. Could it be that - during an update - the app was temporarily disabled while at the same some one tried to fetch the notifications?

I'll try to verify that with the access logs

[SystemKeeper]

SELECT * FROM oc_notifications WHERE app = 'text' AND user = '<user>';
+-----------------+------+--------------+------------+-------------+-----------+-----------+-------------------------------------------------------------+---------+--------------------+------+------+---------+
| notification_id | app  | user         | timestamp  | object_type | object_id | subject   | subject_parameters                                          | message | message_parameters | link | icon | actions |
+-----------------+------+--------------+------------+-------------+-----------+-----------+-------------------------------------------------------------+---------+--------------------+------+------+---------+
|           73712 | text | <user>       | 1696933982 | file        | 859331    | mentioned | {"sourceUser":"marcel.mueller","targetUser":"<user>"}       |         | []                 |      |      | []      |
+-----------------+------+--------------+------------+-------------+-----------+-----------+-------------------------------------------------------------+---------+--------------------+------+------+---------+

That is the only notification of the user in question.
It happenes multiple times during the day:

 grep mentioned nextcloud.log.3 | wc -l
19

So seems not related to the update. But I don't see anything weird in this entry? I also checked that 859331 is in oc_filecache.

[juliusknorr]

Is <user> the actual user id or did you replace this?

[SystemKeeper]

Is <user> the actual user id or did you replace this?

I replaced it. It has the same format as "marcel.mueller", and also does not contain any special characters.

[SystemKeeper]

1696933982

Is from last october. So is a very old notification.