def prev(self, header, same_or_high=False, offset=-1):
        index, headers = self._index(header, same_or_high)
        if index == 0:
            return None
        return headers[index + offset]
Flush and post all metrics to the server. Note that this is a blocking
dataset/ETHPy150Open mgaitan/sublime-rst-completion/headers.py/RstHeaderTree.prev--crossover with--dataset/ETHPy150Open DataDog/datadogpy/datadog/threadstats/base.py/ThreadStats.flush