---
features:
  - |
    WSGI server processes can now notify systemd when they are ready.

  - |
    Added a new middleware that allows users and operators to configure
    accounts and containers to use RFC-compliant (i.e., double-quoted)
    ETags. This may be useful when using Swift as an origin for some content
    delivery networks. For more information, see `the middleware documentation
    <https://docs.openstack.org/swift/latest/middleware.html#etag-quoter>`__.

  - |
    Added ``ttfb`` (Time to First Byte) and ``pid`` (Process ID) to the set
    of available proxy-server log fields. For more information, see
    `the documentation <https://docs.openstack.org/swift/latest/logs.html>`__.

fixes:
  - |
    Improved proxy-server performance by reducing unnecessary locking,
    memory copies, and eventlet scheduling.

  - |
    Reduced object-replicator and object-reconstructor CPU usage by only
    checking that the device list is current when rings change.

  - |
    Improved performance of sharded container listings when performing
    prefix listings.

  - |
    Improved container-sync performance when data has already been
    deleted or overwritten.

  - |
    Account quotas are now enforced even on empty accounts.

  - |
    Getting an SLO manifest with ``?format=raw`` now responds with an ETag
    that matches the MD5 of the generated body rather than the MD5 of
    the manifest stored on disk.

  - |
    Provide useful status codes in logs for some versioning and symlink
    subrequests that were previously logged as 499.

  - |
    Fixed 500 from cname_lookup middleware. Previously, if the looked-up
    domain was used by domain_remap to update the request path, the
    server would respond Internal Error.

  - |
    On Python 3, fixed an issue when reading or writing objects with a content
    type like ``message/*``. Previously, Swift would fail to respond.

  - |
    On Python 3, fixed a RecursionError in swift-dispersion-report when
    using TLS.

  - |
    Fixed a bug in the new object versioning API that would cause more
    than ``limit`` results to be returned when listing.

  - |
    Various other minor bug fixes and improvements.