Why agent requires adm group on deb package?

[gcb]

What's wrong?

seeing #524
and the fix #737

files moved around, new location at https://github.com/rfratto/agent/blob/main/packaging/grafana-agent/deb/control/postinst#L23 still without explanation

instead of simply adding the user to the journald reader permission group systemd-journal, it is also added to adm group with no further explanation why.

adm is usually not required to read logs and can act on a lot more in regular setups.

Steps to reproduce

1. install
2. remove user from group
3. nothing bad happens as far as i can tell.

System information

No response

Software version

No response

Configuration

No response

Logs

No response

[github-actions]

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[gcb]

any functionality is impacted that I am missing?