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Version 4.0

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@darold darold released this 06 Mar 09:54
· 2 commits to master since this release
v4.0
8d236df

2024-03-06 - Version 4.0

This release is a major release that fixes issues reported since
the past six months and adds several new features.

New features:

  • Add report of devices /sys/block/queue informations (scheduler,
    rotational, rq_affinity and add_random) to the System report.
  • Add report of PGDATA files to be able to detect symlinks and
    unwanted files in this directory.
  • Add reports for Wait Event when the pg_wait_sampling extension is use.
    First report show the distribution by Wait Event Type and second report
    show the distribution by Wait Events.
  • Add report for Global subtransactions counters if extension
    pg_subxact_counters is installed in the connection database.
    Subtransactions can lead to performance issue, report Counters
    to monitor the subtransactions (generation rate, overflow, state).
  • Add collect of /sys/kernel/debug/sched/migration_cost_ns with kernel >= 5.19
    collect start-end metrics only twice (start and end)
  • Add a chapter in documentation about additional statistics
    collected from extensions pg_stat_statements, pg_wait_sampling
    and pg_subxact_counters.
  • Add option --no-pg_stats-dump to pgcluu_collectd to avoid collecting such
    statistics for performances reasons. Thanks for the patch to Frederic Yhuel.
  • Make SIGINT interrupts gracefully pgcluu_collectd like SIGHUP. Thanks to
    Frederic Yhuel for the patch.
  • Add ddump of the pg_stats view to pgcluu_collectd. The point is for the
    DBA to study the statistics, and nothing else. Thanks for the patch to
    Frederic Yhuel.
    It is useful to dump the pg_stats views. The dump can be imported in a table
    created like this:
    CREATE TABLE my_client_pgstats (
      export_time TEXT,
      dbname TEXT,
      schemaname TEXT,
      tablename TEXT,
      attname TEXT,
      inherited BOOLEAN,
      null_frac REAL,
      avg_width INT,
      n_distinct REAL,
      most_common_vals TEXT[],
      most_common_freqs REAL[],
      histogram_bounds TEXT[],
      correlation REAL
    );

Note that the columns most_common_vals and histogram_bounds have
the type TEXT[] instead of anyarray.

Compatibility:

There is not compatibility issues but a change of behavior with default
to dump the pg_stats view. Following the number of table/indexes in the
databases it could take more time collecting the statistic so in this case
the interval of polling should be increase. There is an new option to disable
the pg_stats dump, --no-pg_stats-dump, if you want to get back to the previous
behavior.

Here is the full list of fixes since previous release.

  • Fix graph labels for TCPv4 errors. Thanks to Christophe Courtois for
    the report.
  • Avoid reporting redundant index if they are not using the same type of
    index. Thanks to Christophe Courtois for the report.
  • Fix file not exists error message when looking at block devices information.
  • Fix broken report when /sys/kernel/debug/sched/migration_cost_ns is not
    readable by the user running pgcluu_colletd
  • Fix devices info (sar -d) for sar >= 12.4.0. Thanks to Christophe Courtois
    for the patch.
  • Fix legend of locks reports.
  • Fix report of locks per database.
  • Fix disable menu for buffercache use
  • Fix mount report that was not reporting NFS mount points.
  • Fix wait_all_childs() function.
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