Support intro
Sorry to hear you’re facing problems 
help.nextcloud.com is for home/non-enterprise users. If you’re running a business, paid support can be accessed via portal.nextcloud.com where we can ensure your business keeps running smoothly.
In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 20.0.5): 23.0.0.10
Operating system and version (eg, Ubuntu 20.04): TrueNAS-12.0-U6
Apache or nginx version (eg, Apache 2.4.25): apache24
PHP version (eg, 7.4): 7.4.19
The issue you are facing:
After upgrading from 22.2.0.2 to 23.0.0.10, I’m now facing this warning:
You are accessing your instance over a secure connection, however your instance is generating insecure URLs. This most likely means that you are behind a reverse proxy and the overwrite config variables are not set correctly.
I haven’t seen this warning before, so I’m not sure why I’m seeing it after upgrading as I haven’t changed anything in my config.php file. I double checked that the truted_ domains array was correctly copied over.
Also, It looks like I have an old backup in data/updater-LONGstringOF_Letters_and_numbers. Is it safe to delete this directory? Contents of data/updater-blahblah/backups/:
nextcloud-20.0.8.1-1618012492
nextcloud-21.0.1.1-1621916826
nextcloud-21.0.2.1-1628968652
I don’t think logs are necessary, but I’ll add if they are.