Description:

Zend\Log\Logger is a component for general purpose logging. It
supports multiple log backends, formatting messages sent to the log,
and filtering messages from being logged. These functions are divided
into the following objects:

- A Logger (instance of Zend\Log\Logger) is the object that your
application uses the most. You can have as many Logger objects as you
like; they do not interact. A Logger object must contain at least one
Writer, and can optionally contain one or more Filters.
- A Writer (inherits from Zend\Log\Writer\AbstractWriter) is
responsible for saving data to storage.
- A Filter (implements Zend\Log\Filter\FilterInterface) blocks log
data from being saved. A filter is applied to an individual writer.
Filters can be chained.
- A Formatter (implements Zend\Log\Formatter\FormatterInterface) can
format the log data before it is written by a Writer. Each Writer has
exactly one Formatter.

Optional: MongoDB (php-pecl-mongo)