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Thomas De Schampheleire
HTML email templates: restrict amount of visible hyperlinks

Users report that some HTML email templates are confusing due to the large
number of hyperlinks in them. They typically click the first thing they see
that looks clickable without actually reading what they are clicking on,
expecting that it all points to the same thing.

In pullrequest invitations, the pullrequest and changeset URLs should be
clickable, but the source and target repository should not: this is not what
you typically want to see when taking action on this mail.

Similarly in comment emails, the corresponding repository should not be
clickable.

Unfortunately, even if we remove the <a> hyperlink tags on these repository
URLs, most mail clients will still recognize the text as being URLs
and make them clickable anyway. Worse, they will do so in a different
styling than the other links.

Therefore, do add <a> tags in the HTML, but make use of styling like that of
data_style, i.e. regular text color, grey background with dark grey border.
The links _will_ thus be clickable but it will not be as inviting as before,
thus removing confusion.
.. _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.