Merge pull request #8318 from rgacogne/ddist-prometheus-labels

dnsdist: Better use of labels in our DoH prometheus export

diff --cc pdns/dnsdist-carbon.cc
Simple merge

diff --cc pdns/dnsdist-lua.cc
Simple merge

diff --cc pdns/dnsdist-tcp.cc
Simple merge

diff --cc pdns/dnsdist.cc
Simple merge

diff --cc pdns/dnsdist.hh
Simple merge

diff --cc pdns/dnsdistdist/doh.cc
Simple merge

diff --cc pdns/dnsdistdist/tcpiohandler.cc
Simple merge

diff --cc pdns/tcpiohandler.hh
Simple merge