def get_counters():
    """Return a dictionary with the following keys::

             count-objects-checked: count of how many objects were checked
             count-objects-healthy: how many of those objects were completely
                                    healthy
             count-objects-unhealthy: how many were damaged in some way
             count-objects-unrecoverable: how many were unrecoverable
             count-corrupt-shares: how many shares were found to have
                                   corruption, summed over all objects
                                   examined
        """
