async def incr(self, metric_name, value=<NUM_LIT:1>, context=None, **kwargs):
self.counters[metric_name] += value<EOL>await self.set(metric_name, self.counters[metric_name], context,<EOL>**kwargs)<EOL>
Increase a metric counter by ``value`` and output result.

        Args:
            metric_name (str): Identifier of the metric.
            value (number): (optional) Value with which to increase the metric.
            context (dict): (optional) Additional key-value pairs which further
                describe the metric, for example: {'remote-host': '1.2.3.4'}