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Update alerta_prometheus.py to honor the silence from ack setting #359

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Update alerta_prometheus.py to honor the silence from ack setting #359

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35 changes: 31 additions & 4 deletions plugins/prometheus/alerta_prometheus.py
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Original file line number Diff line number Diff line change
Expand Up @@ -23,6 +23,7 @@
ALERTMANAGER_SILENCE_DAYS = os.environ.get('ALERTMANAGER_SILENCE_DAYS') or app.config.get('ALERTMANAGER_SILENCE_DAYS', 1)
ALERTMANAGER_SILENCE_FROM_ACK = os.environ.get('ALERTMANAGER_SILENCE_FROM_ACK') or app.config.get('ALERTMANAGER_SILENCE_FROM_ACK', False)


class AlertmanagerSilence(PluginBase):

def __init__(self, name=None):
Expand All @@ -38,6 +39,28 @@ def post_receive(self, alert):
return

def status_change(self, alert, status, text):
'''
If a silence exists for an open or closed alert we probably want to remove it
'''
if status in ('open', 'closed'):

silenceId = alert.attributes.get('silenceId', None)
if silenceId:
LOG.debug('Alertmanager: Remove silence for alertname=%s instance=%s', alert.event, alert.resource)
base_url = ALERTMANAGER_API_URL or alert.attributes.get('externalUrl', DEFAULT_ALERTMANAGER_API_URL)
url = base_url + '/api/v1/silence/%s' % silenceId
try:
r = requests.delete(url, auth=self.auth, timeout=2)
except Exception as e:
raise RuntimeError("Alertmanager: ERROR - %s" % e)
LOG.debug('Alertmanager: %s - %s', r.status_code, r.text)

try:
alert.attributes['silenceId'] = None
except Exception as e:
raise RuntimeError("Alertmanager: ERROR - %s" % e)
LOG.debug('Alertmanager: Removed silenceId %s from attributes', silenceId)

return alert

def take_action(self, alert: Alert, action: str, text: str, **kwargs) -> Any:
Expand All @@ -48,9 +71,13 @@ def take_action(self, alert: Alert, action: str, text: str, **kwargs) -> Any:
if alert.event_type != 'prometheusAlert':
return alert

if not ALERTMANAGER_SILENCE_FROM_ACK:
LOG.warning("Alertmanager silence from ack is disabled")
return alert

if action == 'ack':

if ALERTMANAGER_SILENCE_FROM_ACK:
if not ALERTMANAGER_SILENCE_DAYS:
silence_seconds = kwargs.get('timeout', alert.timeout)
else:
try:
Expand Down Expand Up @@ -98,10 +125,10 @@ def take_action(self, alert: Alert, action: str, text: str, **kwargs) -> Any:
try:
data = r.json().get('data', [])
if data:
silenceId = data['silenceId']
alert.attributes['silenceId'] = silenceId
silenceId = data['silenceId']
alert.attributes['silenceId'] = silenceId
else:
silenceId = alert.attributes.get('silenceId', "unknown")
silenceId = alert.attributes.get('silenceId', "unknown")
text = text + ' (silenced in Alertmanager)'
except Exception as e:
raise RuntimeError("Alertmanager: ERROR - %s" % e)
Expand Down