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Jan Heylen

diff: get collapse target via .attr instead of .prop

Commit 3f017db297c4 was not fully tested and broke collapse/expand of diffs on
changesets. $button is not a link with a target and the target can thus not be
retrieved with .prop('target'); $button is just a span that happens to have a
custom attribute with the name 'target'.

We thus revert back to the old way of retrieving it with .attr('target'). (It
would perhaps be even better to use data attributes and name it data-target and
use .data('target') ...)

.. _statistics:

=====================
Repository statistics
=====================

Kallithea has a *repository statistics* feature, disabled by default. When
enabled, the amount of commits per committer is visualized in a timeline. This
feature can be enabled using the ``Enable statistics`` checkbox on the
repository ``Settings`` page.

The statistics system makes heavy demands on the server resources, so
in order to keep a balance between usability and performance, statistics are
cached inside the database and gathered incrementally.

When Celery is disabled:

  On each first visit to the summary page a set of 250 commits are parsed and
  added to the statistics cache. This incremental gathering also happens on each
  visit to the statistics page, until all commits are fetched.

  Statistics are kept cached until additional commits are added to the
  repository. In such a case Kallithea will only fetch the new commits when
  updating its statistics cache.

When Celery is enabled:

  On the first visit to the summary page, Kallithea will create tasks that will
  execute on Celery workers. These tasks will gather all of the statistics until
  all commits are parsed. Each task parses 250 commits, then launches a new
  task.