docs: def _check_command_stats(self, conn, tags):
          """Get command-specific statistics from redis' INFO COMMANDSTATS command
          """
          try:
              command_stats = conn.info("commandstats")
          except Exception:
              self.warning('Could not retrieve command stats from Redis. INFO COMMANDSTATS only works with Redis >= 2.6.')
              return
  
          for key, stats in iteritems(command_stats):
              command = key.split('_', 1)[1]
              command_tags = tags + ['command:{}'.format(command)]
  
              # When `host:` is passed as a command, `calls` ends up having a leading `:`
              # see https://github.com/DataDog/integrations-core/issues/839
              calls = stats.get('calls') if command != 'host' else stats.get(':calls')
  
              self.gauge('redis.command.calls', calls, tags=command_tags)
              self.gauge('redis.command.usec_per_call', stats['usec_per_call'], tags=command_tags)