[dnsdist] prometheus values queries-per-connection and connection-duration always 0 for DoH?

[Christoph]

Hi,

while creating a dashboard for dnsdist prometheus metrics
we noticed that the following values are always 0 in case of DoH,
in case of DoT they appear to work fine:

dnsdist_frontend_tcpavgqueriesperconnection
dnsdist_frontend_tcpavgconnectionduration

We do use DoH and there are ongoing DoH queries.

dnsdist version: 1.5.1

Is anyone successfully seeing non-zero values in these metrics for DoH
or is this a bug?

thanks,
Christoph