Destination for the service standard error stream, written as StandardError=. Common values include journal, null, inherit, journal+console, file:/path/to/file, append:/path/to/file, and truncate:/path/to/file.

Advanced systemd targets such as kmsg, tty, socket, and fd:name are also accepted.

If you enter an absolute file path, it will be written as append:/path/to/file. Use journal to keep errors in journalctl, or leave empty to inherit the systemd default.