Get names of timeseries the collector produces.

def _get_names(self, collector):
        """Get names of timeseries the collector produces."""
        desc_func = None
        # If there's a describe function, use it.
        try:
            desc_func = collector.describe
        except AttributeError:
            pass
        # Otherwise, if auto describe is enabled use the collect function.
        if not desc_func and self._auto_describe:
            desc_func = collector.collect

        if not desc_func:
            return []

        result = []
        type_suffixes = {
            'counter': ['_total', '_created'],
            'summary': ['', '_sum', '_count', '_created'],
            'histogram': ['_bucket', '_sum', '_count', '_created'],
            'gaugehistogram': ['_bucket', '_gsum', '_gcount'],
            'info': ['_info'],
        }
        for metric in desc_func():
            for suffix in type_suffixes.get(metric.type, ['']):
                result.append(metric.name + suffix)
        return result