Introduction
************

Happyface is a meta monitoring tool, aggregating data from multiple services or databases
to provide a quick overview of the general status. Per monitored service, an instance of an
:doc:`analysis <analysis>` is run.

Examples of such analysis instances are shown below. Instances are assigned to a category,
which groups them on the Happyface website and provides a comprehensive overview.

|transfer_rates_by_host_image| |overall_transfer_image|

The data of the :doc:`analyses <analysis>` is stored in a `PostgreSQL
<https://www.postgresql.org/>`_ :doc:`database <database>`.

.. |overall_transfer_image| image:: images/transfer_rate.png
    :width: 49%
    :align: bottom
    :alt: Overall dCache transfer rate
    :class: no-scaled-link

.. |transfer_rates_by_host_image| image:: images/transfer_by_host.png
    :width: 49%
    :align: bottom
    :alt: dCache transfer rates by host
    :class: no-scaled-link