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Thomas De Schampheleire
admin: hooks: restore delete functionality as intended

Commit 9d34bea3059d9abd0d912f37a2475ee67c8e2918 ("style: various minor-ish
markup changes, preparing for Bootstrap") partially broke the delete
functionality of hooks. When clicking the delete button, the hook is deleted
via AJAX and then the corresponding form group is intended to be removed
visually. This relies on an 'id' attribute on the form-group div.

The mentioned commit moved the div with the 'id' attribute outside the loop
iterating over the different hooks, so that there no longer is a div with
the id expected by the delete button. The hook would still be deleted, but
the page visually still looks the same until refresh/Save.

Move the diff back into the loop. This causes a little more visual
separation between the different hooks, but still looks OK.
The layout of the built-in hooks (that can't be removed) is left untouched.
Making the same change there would be possible but there the extra vertical
whitespace seems somewhat unnecessary, although this is personal.
.. _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.