Nextcloud 500 error - where to start searching

I'm using the team container for several month now without any problem. Installed as vm-guest under esxi.
Last week we had a power failure. After reboot nextcloud isn't working anymore.

The instance seems to run:

kubectl get pods
NAME READY STATUS RESTARTS AGE
svclb-traefik-6zjzv 2/2 Running 42 263d
traefik-694bfcf5fd-s6phg 1/1 Running 21 263d
landingpage-7d68966c84-5rf8f 1/1 Running 21 263d
nextcloud-team-nextcloud-redis-69df94ccb9-j5lvf 1/1 Running 21 263d
nextcloud-team-nextcloud-db-76c6ccb6fc-jgnhs 1/1 Running 21 263d
nextcloud-team-nextcloud-nc-54b875ddd5-kgn7s 2/2 Running 43 263d

But if I want to access nextcloud with browser I receive

#########################################################
Interner Serverfehler
Der Server konnte die Anfrage nicht fertig stellen.
Sollte dies erneut auftreten, sende bitte die nachfolgenden technischen Einzelheiten an Deinen Server-Administrator.

Weitere Details können im Server-Protokoll gefunden werden.
Technische Details

Entfernte Adresse: 10.42.0.203
Anfragekennung: u2OsmDD1AM9cHeCk3kdx
#########################################################
Unfortunately I'm the administrator but I have no idea.......

In /var/log/pods/default_nextcloud-team-nextcloud-nc-54b875ddd5-kgn7s_d2c201aa-0e7f-4fb6-be4c-be964ab9d940/web
I found entries like this:

2021-01-24T22:33:39.36818601+01:00 stdout F 10.42.0.198 - kdxyz [24/Jan/2021:21:33:39 +0000] "GET /status.php HTTP/1.1" 500 425 "-" "Mozilla/5.0 (Windows) mirall/3.0.1stable-Win64 (build 20200828) (Nextcloud)"

Where can I start searching for this error?

thanks in advance!

Klaus Deiss

Start with the listed Kubernetes pods and inspect the Nextcloud container logs around the failing /status.php request, including the web log at /var/log/pods/.../web. Compare the pod state with the server-protocol details from the browser. Done means identifying the post-reboot failure and restoring successful Nextcloud access.

Written by the indexing model from the issue text.