[dnsdist] First beta release of PowerDNS DNSdist 2.1.0

[Remi Gacogne]

Today we released the first beta version of what will become PowerDNS 
DNSdist 2.1.0.

This new version brings new features and improvements since the first alpha:

- Opentelemetry: add flags field in TRACEPARENT EDNS option
- Add prepend and append methods to Lua DNSName
- Export DNS flags via ProtoBuf
- Add actions, methods and FFI functions to unset a tag
- Implement "allowed rcodes/total" ratio dynamic rule
- Subnets excluded from dynamic rules should not count towards thresholds
- Add a Lua callback to validate health-check responses

It also fixes several issues reported against the first alpha:

- Do not create dnsdist.yml in RPM system configuration directory
- Only install dnsdist.yml-dist if yaml support was enabled (Holger 
Hoffstätte)
- Work around Quiche not dealing well with removed congestion algorithms
- Better handling of invalid ``Base64`` content
- Fix build issues with ipcrypt2
- Correctly set Span ID to downstreams
- Fix invalid substr() use in the DNS overlay parser
- Don't start the NetworkListener thread in config check mode
- Meson: Add missing checks for TLS_client_method, 
gnutls_transport_set_fastopen

Compared to 2.0, 2.1 also brings the following new features:

- OpenTelemetry tracing support has been added
- Structured logging has been added
- A and AAAA records can now be shuffled in the packet cache (Karel Bilek)
- Lua parsers are now available for A, AAAA and CNAME records (Ensar 
Sarajčić)
- a Lua hook can now be invoked on server state changes (@pacnal)

Please be aware that DNSdist now looks by default for a configuration 
file named "dnsdist.yml" in the systemd configuration directory, instead 
of "dnsdist.conf". It will however fall back for a "dnsdist.conf" file 
if there is no "dnsdist.yml" file, so existing configurations should 
still work as expected.

Other notable changes are the removal of DNS over HTTPS support via the 
h2o library, meaning DNS over HTTPS is now only available via the 
nghttp2 library.

As this release introduces major changes, we invite everyone to test it 
as soon as possible to make sure that all existing use cases are still 
working properly, and that there is no performance degradation.

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].

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-2.1.0-beta1
[3]: https://dnsdist.org/upgrade_guide.html
[4]: https://github.com/PowerDNS/pdns/issues/new/choose
[5]:
https://downloads.powerdns.com/releases/dnsdist-2.1.0-beta1.tar.xz
[6]:
https://downloads.powerdns.com/releases/dnsdist-2.1.0-beta1.tar.xz.sig
[7]: https://repo.powerdns.com

Best regards,
-- 
Remi Gacogne
PowerDNS.COM BV - https://www.powerdns.com/
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