def _keepalive(self, c):
        raise NotImplementedError()
Set document['title'] metadata title from the following
dataset/ETHPy150Open rasky/geventconnpool/src/geventconnpool/pool.py/ConnectionPool._keepalive--crossover with--dataset/ETHPy150Open adieu/allbuttonspressed/docutils/transforms/frontmatter.py/DocTitle.set_metadata