code: def tags(self):
          
          tags = self.config.get('tags', {})
          env_tags = os.environ.get('JAEGER_TAGS', '')
          if env_tags:
              for kv in env_tags.split(','):
                  key, value = kv.split('=')
                  tags[key.strip()] = value.strip()
          return tags
docs: :return: Returns tags from config and `JAEGER_TAGS` environment variable
          to use as process-wide tracer tags