Netmetr tos module DNS issue

Dear All,

just a quick note that the turris OS netmetr module seems to have ping issues, at least on my dual stack IPv4/6 link:

Aug 8 10:07:59 turris crond[28616]: (root) CMDOUT (ping: unknown host ipv6.speed.netmetr.cz)

The issue seems to be that trying IPv4-only ping on ipv6.speed.netmetr.cz does simply not work.
I have not had a look inside the netmetr module, but the issue should be easy to fix…