- update to 4.8.0 with these major changes:
* Structured Logging has been implemented for almost all
subsystems.
* Optional Serve Stale functionality has been implemented,
providing resilience against connectivity problems towards
authoritative servers.
* Optional Record Locking has been implemented, providing an extra
layer of protection against spoofing attempts at the price of
reduced cache efficiency.
* Internal tables used to track information about authoritative
servers are now shared instead of per-thread, resulting in
better performance and lower memory usage.
* EDNS padding of outgoing DoT queries has been implemented,
providing better privacy protection.
* Metrics have been added about the protobuf and dnstap logging
subsystems and the rcodes received from authoritative
servers.