vnStat 2.3

• Fixed
  • Traffic rate wasn't being shown for the last entry of most lists during
    the first update of the next period (first SaveInterval minutes of each
    new hour, day, month and year)
  • Systemd example service file could result in database file write issues
    if the used systemd version supported ProtectSystem=strict but didn't
    support StateDirectory (issue seen at least with systemd 232 in Debian 9)
  • Debian and Red Hat init.d example files had wrong path for the pid file
  • Interfaces could end up staying marked as 'disabled' in the database even
    after becoming back active and monitored, only the shown status was wrong
    without resulting in any data loss
  • Some image outputs didn't allocate enough height for the image resulting
    in the last row having less space below it than intended
• New
  • Automatic interface selection when the Interface configuration setting
    is left empty (new default)
  • Add configuration option DatabaseWriteAheadLogging to enable SQLite
    Write-Ahead Logging mode which may provide some disk i/o benefits,
    see https://www.sqlite.org/wal.html for more details and note that
    SQLite 3.22.0 or later is required to support read-only operations
  • Add configuration option DatabaseSynchronous for changing the SQLite
    setting of the "synchronous" flag, see
    https://www.sqlite.org/pragma.html#pragma_synchronous for more details
  • Show warning in log if writing cached data to database is slow
  • Try database query for up to 5 seconds when database is busy or locked
    instead of giving up immediately
  • Continue daemon process execution with data caching if database writes
    fail due to disk being full

vnStat 2.2

• Fixed
  • O_CLOEXEC undeclared error when compiling with glibc older than 2.12
  • Image output --headertext wasn't being applied to some output types
  • DefaultDecimals setting wasn't controlling all outputs
  • Traffic rate for the last entry of the 5 minute resolution list wasn't
    being correctly calculated
• New
  • Detection of 32-bit / 64-bit kernel interface counters for improving
    traffic calculations in rollover situations, cfg: 64bitInterfaceCounters
  • Possibility in queries to merge data from multiple interfaces to one
    output with interface1+interface2 syntax
  • Highlight current day in top list when visible
  • Changes in interface specific detected bandwidth limits are reported
    in the log
  • UpdateInterval value is automatically adjusted during daemon startup if
    found to be too high compared to the value of MaxBandwidth
• Notes
  • Added clarification to the man page that the 'jsonversion' and
    'xmlversion' fields in the --json and --xml outputs should be seen as
    the API version and compared to the previously used version in 3rd party
    implementations for verifying compatibility
  • Default value of UpdateInterval is now 20 instead of previous 30 seconds

vnStat 2.1

• Fixed
  • --oneline could segmentation fault if database had total traffic values
    set but didn't have any daily or monthly traffic (Arch bug #60588)
  • No proper error message was produced when querying interface which didn't
    exist in the database
  • Several typos and spelling mistakes in documentation
  • Daemon:waittimesync_does_not_wait_with_new_interfaces test was failing if
    the system used a time zone with a negative numeric value
  • Traffic estimate and average rate for ongoing month was not being
    calculated correctly when MonthRotate had a value greater than 1
  • Accuracy of traffic estimate and average rate for the ongoing month could
    be slightly skewed depending on the used time zone
• New
  • Remove possible PollInterval and UpdateInterval drift over time
  • Sync SaveInterval to full minutes

vnStat 2.0

• Fixed
  • Data rate calculations when using SI decimal prefixes
  • Workaround for filled arcs not drawn correctly with some versions
    of libgd (libgd/libgd#351)
• New
  • C struct dump database has been replaced with sqlite database,
    full data import included from legacy databases of versions 1.3 - 1.18
  • Option to select units to use SI decimal prefixes using calculations
    with powers of 1000 (IEC and JEDEC prefixes use powers of 1024)
  • Yearly and 5 minute resolution statistics
  • Pebibyte and exbibyte support
  • Options the configure the length of each list output
  • Option to limit the length of --json and --xml outputs
  • Hourly list output replaces the hourly graph when the -h parameter is used
  • Hourly graph is accessible with -hg / --hoursgraph parameter
  • Options -b / --begin and -e / --end for specifying query time range
  • Configuration comes with ISO 8601 date formats as new defaults
  • User configurable data retention durations for all resolutions with
    following changed defaults:

	v1.18	v2.0
5 minutes	n/a	576	(48 hours)
hours	24	96	(4 days)
days	30	62	(2 full months)
months	12	25	(2 full years)
years	n/a	all
top days	10	20

• Removed
  • Weekly output
  • Merge of data from multiple interfaces to one output
  • --testkernel
  • --exportdb, use --oneline, --json or --xml instead
  • --importdb, -u / --update and related options using vnstat command
  • Old style (default in versions up to 1.7) summary layout in image output

vnStat 1.18

• Fix: Misspellings, compiler warnings and possible error situations (pull requests by Christian Göttsche)
• Hardening added to examples/systemd/vnstat.service (pull request by Christian Göttsche)
• Add RTC sanity check and sync wait to daemon startup, the possible wait duration can be configured using the TimeSyncWait keyword
• Add optional parameter to --oneline output for forcing fields to output in bytes
• Add --json support for -l / --live and -tr outputs
• Number of decimals used in outputs can be configured using DefaultDecimals and HourlyDecimals
• Add section separators for improving readabilty of the vnstat -h output, configurable using HourlySectionStyle

vnStat 1.17

• Fix: --importdb was creating invalid databases since version 1.15
• Fix: console output was being buffered which resulted in lack of output
  in at least systemd log
• Add cross-compilation detection and improve install-data-hook to not
  assume that the binaries can be executed in the host system

Note: 1.17 was released on Feb 16, 2017