• Fix scoping of on-disk state to reflect system type/scope/id
  • Previously we only considered API key to determine which state to save,
    which meant that in configurations with multiple servers but a single
    organization API key we'd usually loose statistics on restarts, or
    get the wrong values for diff-ing the query statistics
  • This is a backwards-incompatible change for the on-disk format and
    therefore bumps the version from 1 to 2. Effectively this will show
    as one period of no data after upgrading to this version, as the
    previously saved counter values in the state file won't be used
• Add support for "%t [%p]: [%l-1] user=%u,db=%d,app=%a,client=%h " log_line_prefix
• Use explicit log file clean up instead of deferrals
  • There have been reports of old temporary files containing log lines
    not being cleaned up fully - attempt to fix that
• systemd config: Fix incorrect specification of memory limit & restart event Dom Hutton #26