[Telegraf] permissions of /var/unbound/unbound_control.key incompatible with telegraf

[ll-SKY-ll]

even though the user "telegraf" is member of the group "unbound", telegraf has no access to unbounds stats and can therefore not export those metrics. See following screenshot

after applying chmod 640 to the keyfile, telegraf is again able to get the stats, as seen in the next screenshot

Possible fix: set permissions for the keyfile to 640

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