[dnsdist] Third Release Candidate of PowerDNS DNSdist 1.8.0

[Remi Gacogne]

Hello!

We are very happy to release the third candidate of what will become 
dnsdist 1.8.0!

This release contains fixes for several issues that were found in the 
second release candidate.

- #12641: Use the correct source address when harvesting failed
- #12639: Fix a race when a cross-protocol query triggers an IO error
- #12638: Report the TCP latency for TCP-only Do53, DoT and DoH backends
- #12648: Report per-incoming transport latencies in the web interface

The first one is actually a follow-up to the "dnsdist is responding from 
the wrong source IP address in some setups" which was incompletely 
corrected in rc2. The second one is a race condition that might have 
been occurring in very specific cases of network errors during 
asynchronous processing of cross-protocol queries. The last issue is a 
bit more complicated: in 1.8.0 we decided to break down the latency 
metrics to provide a more accurate view of what was actually going on:

- global latency metrics are now per incoming protocol (Do53 UDP, Do53 
TCP, DoT, DoH)
- backend latency metrics are split between UDP (Do53) and TCP (Do53 
TCP, DoT, DoH)

This change brought some adjustment in the interfaces consuming these 
metrics, and it was reported that this was not quite right. The web 
interface, for example, was only reporting the UDP-based metrics and not 
the other ones.

Please see the dnsdist website [1] for the more complete changelog [2] 
and the current documentation. The upgrade guide is also available there 
[3].

Please send us all feedback and issues you might have via the mailing 
list, or in case of a bug, via GitHub [4].

We are immensely grateful to the PowerDNS community for the reporting of 
bugs, issues, feature requests, and especially to the submitters of 
fixes and implementations of features.

The release tarball [5] and its signature [6] are available on the 
downloads website, and packages for several distributions are available 
from our repository [7].

[1]: https://dnsdist.org
[2]: https://dnsdist.org/changelog.html#change-1.8.0-rc3
|3]: https://dnsdist.org/upgrade_guide.html#x-to-1-8-0
[4]: https://github.com/PowerDNS/pdns/issues/new/choose
[5]:
https://downloads.powerdns.com/releases/dnsdist-1.8.0-rc3.tar.bz2
[6]:
https://downloads.powerdns.com/releases/dnsdist-1.8.0-rc3.tar.bz2.sig
[7]: https://repo.powerdns.com
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