code: def _init(self):
      _reload_ray_gauge_set_available()
  
      if ray_metrics is not None:  # pragma: no branch
          self._metric = ray_metrics.Gauge(
              self._name, self._description, self._tag_keys
          )
  
file_path: mars/mars/metrics/backends/ray/ray_metric.py
imports: from typing import Optional, Dict
  from ....utils import lazy_import, lazy_import_on_load
  from ..metric import AbstractMetric, AbstractCounter, AbstractGauge, AbstractMeter, AbstractHistogram
label_desc: Use image node_id 1 for calling the RayMetricMixin obj's underlying member method code with example usage: obj._init() without return types