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Notes for BIND 9.20.10
----------------------

New Features
~~~~~~~~~~~~

- Implement a new :namedconf:ref:`notify-defer` configuration option.

  This new option sets a delay (in seconds) to wait before sending a set
  of ``NOTIFY`` messages for a zone. Whenever a ``NOTIFY`` message is
  ready to be sent, sending is deferred for this duration. This option
  should not be confused with the :namedconf:ref:`notify-delay` option.
  The default is 0 seconds. :gl:`#5259`

Removed Features
~~~~~~~~~~~~~~~~

- Implement the systemd notification protocol manually to remove
  dependency on libsystemd.

Bug Fixes
~~~~~~~~~

- Fix zone deletion issue.

  A secondary zone could initiate a new zone transfer from the primary
  server after it had been already deleted from the secondary server,
  and before the internal garbage collection was activated to clean it
  up completely. This has been fixed. :gl:`#5291`

- Fix a zone refresh bug.

  A secondary zone could fail to further refresh with new versions of
  the zone from a primary server if :iscman:`named` was reconfigured
  during the SOA request step of an ongoing zone transfer. This has been
  fixed.  :gl:`#5307`