def _IsAlertRecovered(self, alert_entity):
test = alert_entity.GetTestMetadataKey().get()
if not test:
logging.error(
'TestMetadata %s not found for Anomaly %s, deleting test.',
utils.TestPath(alert_entity.GetTestMetadataKey()),
alert_entity)
return False
config = anomaly_config.GetAnomalyConfigDict(test)
max_num_rows = config.get('max_window_size',
find_anomalies.DEFAULT_NUM_POINTS)
rows = [
r for r in find_anomalies.GetRowsToAnalyze(test, max_num_rows)
if r.revision > alert_entity.end_revision
]
change_points = find_anomalies.FindChangePointsForTest(rows, config)
delta_anomaly = (alert_entity.median_after_anomaly -
alert_entity.median_before_anomaly)
for change in change_points:
delta_change = change.median_after - change.median_before
if (self._IsOppositeDirection(delta_anomaly, delta_change) and
self._IsApproximatelyEqual(delta_anomaly, -delta_change)):
logging.debug(
'Anomaly %s recovered; recovery change point %s.',
alert_entity.key, change.AsDict())
return True
return False
def _IsAnomalyRecovered(anomaly_entity):
"""Checks whether an Anomaly has recovered.
An Anomaly will be considered "recovered" if there's a change point in
the series after the Anomaly with roughly equal magnitude and opposite
direction.
Args:
anomaly_entity: The original regression Anomaly.
Returns:
True if the Anomaly should be marked as recovered, False otherwise.
"""
test = anomaly_entity.test.get()
config = anomaly_config.GetAnomalyConfigDict(test)
max_num_rows = config.get('max_window_size',
find_anomalies.DEFAULT_NUM_POINTS)
rows = [
r for r in find_anomalies.GetRowsToAnalyze(test, max_num_rows)
if r.revision > anomaly_entity.end_revision
]
change_points = find_anomalies.FindChangePointsForTest(rows, config)
delta_anomaly = (anomaly_entity.median_after_anomaly -
anomaly_entity.median_before_anomaly)
for change in change_points:
delta_change = change.median_after - change.median_before
if (_IsOppositeDirection(delta_anomaly, delta_change)
and _IsApproximatelyEqual(delta_anomaly, -delta_change)):
logging.debug('Anomaly %s recovered; recovery change point %s.',
anomaly_entity.key, change.AsDict())
return True
return False