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Authored by jbond on Apr 30 2019, 10:57 AM.

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	F28866515: raw.txt
	Apr 30 2019, 10:57 AM

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	def latest(self, metric: str, host: str, timeperiod: Optional[str] = '2m') -> float:
	"""Get the latest prometheous metric

	Arguments:
	metric (str): name of the prometheous metric
	host (str): hostname of the node to search for

	Returns:
	float: The current value of the metric or -1 if no values returned

	Raises:
	PrometheusError: on faliure

	"""
	query = 'sum(irate({metric}{{instance=~"{host}(:[0-9]{{1,5}})?"}}[{timeperiod}]))'.format(
	metric=metric, host=host, timeperiod=timeperiod)
	result = self.query(query)

	if not result:
	logger.warning('no metrics returned for time period')
	return -1

	return float(result[0]['value'][1])


	latest('apache_accesses_total', 'mw1222')

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