Resolved file with .secure_site_id extension

[spip]

Server operating system version

CentOS Linux 7.9.2009 (Core)

Plesk version and microupdate number

Version 18.0.48

Hello,
I saw recently in the main folder of my websites (same location that httpdocs ) a new file : .secure_site_id
The creation has been done in the middle of the night a few days ago.
Do you know what this file is ?
Thank you for your help
Best regards,

 

[spip]

Hi. I found the answer.
It's coming for the extension imunify360. I have a subscription to protect my server.
See below the answer of the customer service.
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"Thank you for contacting Imunify support.
We can confirm those are internal files from Imunify360 for future features that are not implemented yet. We cannot give more details, unfortunately, but the presence of that file is not a cause for concern.
In case you have any questions, please let us know."