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Thomas De Schampheleire
docs: reorganize index page

Reorganize the index page of the manual into three main sections:
administrator guide, user guide, developer guide. In principle,
administrators, users and developers are independent roles that can be
fulfilled by different people.

'Administrators' install, configure and maintain Kallithea. They have
'admin' privilege in the web interface.

'Users' do not have access to the Kallithea installation files. They can
only access the web interface, and generally do not have 'admin' privilege.
They may be the owner of repositories, repository groups, or user groups,
and as such modify the settings of these objects, even though they cannot
modify the settings of Kallithea itself.

'Developers' modify the Kallithea source code. They may or may not
contribute these changes back to the Kallithea community.



The 'Readme' section is a bit outside of this classification. As it serves
as a basic introduction to Kallithea, it is kept first.

The 'Index' and 'Search' functionality are not really 'part of' the manual,
so should not be under 'Other topics'. Instead they are put at the very top
so they are readily visible.


This commit is only changing the index page. Subsequent commits can move and
split some documentation files in the repository to mirror this structure.
For example, the 'Version control systems support' page has information for
administrators (ini settings and importing existing repositories) as well as
for users (handling Mercurial subrepositories).
.. _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.