Here are the details :
pi@raspberry:~ $ hostnamectl
Static hostname: raspberry
Icon name: computer
Machine ID: e1d2235b902c49048f981930230b85f7
Boot ID: 1c1e443981ad4ec787b46917396623a3
Operating System: Debian GNU/Linux 11 (bullseye)
Kernel: Linux 5.15.76-v8+
Architecture: arm64
pi@raspberry:~ $ cat /etc/os-release
PRETTY_NAME="Debian GNU/Linux 11 (bullseye)"
NAME="Debian GNU/Linux"
VERSION_ID="11"
VERSION="11 (bullseye)"
VERSION_CODENAME=bullseye
ID=debian
HOME_URL="https://www.debian.org/"
SUPPORT_URL="https://www.debian.org/support"
BUG_REPORT_URL="https://bugs.debian.org/"
pi@raspberry:~ $ lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 11 (bullseye)
Release: 11
Codename: bullseye
pi@raspberry:~ $