• smartctl: New option --json=y[c] selects YAML output.
• smartctl: -i: Prints ATA TRIM and Zoned Device capabilities.
• smartctl: -j: Fixed scsi_grown_defect_list value.
• smartctl: -a: Prints SCSI 'Accumulated power on time'.
• smartctl: -n POWERMODE: SCSI support.
• smartctl: -s standby,now and -s standby,off: SCSI support.
• smartctl: -c: NVMe 1.4 additions.
• smartd: Support for staggered self-tests.
• smartd: No longer writes attribute log if no attributes were read
  due to standby mode or other error.
• smartd: Now resolves symlinks before device names are checked for
  duplicates.
• smartd: Fixed SMARTD_DEVICETYPE environment variable if DEVICESCAN is
  used without -d TYPE.
• ATA: Device type -d jmb39x-q,N for JMB39x protocol variant used by
  some QNAP NAS devices.
• ATA: Device type -d jms56x,N for JMS562 USB to SATA RAID bridges.
• SCSI: Improved heuristics for log subpages of new and very old disks.
• NVMe: Log transfer size limited to avoid device or kernel crashes.
• NVMEe/USB: Device type -d sntrealtek for Realtek RTL9210 USB to
  NVMe bridges.
• update-smart-drivedb: New option --branch X.Y.
• HDD, SSD and USB additions to drive database.
• Dropped support for pre-C99 snprintf().
• configure: Dropped option --without-working-snprintf.
• configure: Fixed -fstack-protector* detection.
• Linux: Various fixes of smartd.service file.
• Darwin: NVMe log support.
• FreeBSD: Device scan does no longer include T_ENCLOSURE devices.
• NetBSD: Fixed timeout handling.
• NetBSD big endian: Fixed ATA register handling.
• OpenBSD: Fixed timeout handling.
• Windows: Dropped backward compatibility fixes for very old compilers.