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alerta_prometheus.py
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import datetime
import logging
import os
import requests
import json
from typing import Any
try:
from alerta.plugins import app # alerta >= 5.0
except ImportError:
from alerta.app import app # alerta < 5.0
from alerta.models.alert import Alert
from alerta.plugins import PluginBase
LOG = logging.getLogger('alerta.plugins.prometheus')
DEFAULT_ALERTMANAGER_API_URL = 'http://localhost:9093'
ALERTMANAGER_API_URL = os.environ.get('ALERTMANAGER_API_URL') or app.config.get('ALERTMANAGER_API_URL', None)
ALERTMANAGER_USERNAME = os.environ.get('ALERTMANAGER_USERNAME') or app.config.get('ALERTMANAGER_USERNAME', None)
ALERTMANAGER_PASSWORD = os.environ.get('ALERTMANAGER_PASSWORD') or app.config.get('ALERTMANAGER_PASSWORD', None)
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)
ALERTMANAGER_USE_EXTERNALURL_FOR_SILENCES = os.environ.get('ALERTMANAGER_USE_EXTERNALURL_FOR_SILENCES') or app.config.get('ALERTMANAGER_USE_EXTERNALURL_FOR_SILENCES',False)
class AlertmanagerSilence(PluginBase):
def __init__(self, name=None):
self.auth = (ALERTMANAGER_USERNAME, ALERTMANAGER_PASSWORD) if ALERTMANAGER_USERNAME else None
super(AlertmanagerSilence, self).__init__(name)
def pre_receive(self, alert):
return alert
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)
if status == 'closed':
LOG.warning("Status is now closed")
return alert
def take_action(self, alert: Alert, action: str, text: str, **kwargs) -> Any:
'''
Set silence in alertmanager.
'''
if alert.event_type != 'prometheusAlert':
return alert
base_url = ALERTMANAGER_API_URL or alert.attributes.get('externalUrl', DEFAULT_ALERTMANAGER_API_URL)
if action == 'close':
LOG.warning("Got a close action so trying to close this in alertmanager too")
url = base_url + '/api/v1/alerts'
raw_data_string = alert.raw_data
raw_data = json.loads(raw_data_string)
# set the endsAt to now so alertmanager will consider it expired or whatever
raw_data["endsAt"] = (datetime.datetime.utcnow() - datetime.timedelta(minutes=5)).replace(microsecond=0).isoformat() + ".000Z"
LOG.debug("Raw data type: {}, Raw data contents: {}".format(type(raw_data),raw_data))
data = [ raw_data ]
try:
r = requests.post(url, json=data, auth=self.auth, timeout=2)
except Exception as e:
raise RuntimeError("Alertmanager: ERROR - %s" % e)
LOG.debug('Alertmanager response was: %s - %s', r.status_code, r.text)
elif action == 'ack' and ALERTMANAGER_SILENCE_FROM_ACK:
if not ALERTMANAGER_SILENCE_DAYS:
silence_seconds = kwargs.get('timeout', alert.timeout)
else:
try:
silence_days = int(ALERTMANAGER_SILENCE_DAYS)
except Exception as e:
LOG.error(
"Alertmanager: Could not parse 'ALERTMANAGER_SILENCE_DAYS': %s", e)
raise RuntimeError(
"Could not parse 'ALERTMANAGER_SILENCE_DAYS': %s" % e)
silence_seconds = silence_days * 86400
LOG.debug('Alertmanager: Add silence for alertname=%s instance=%s timeout=%s',
alert.event, alert.resource, str(silence_seconds))
data = {
"matchers": [
{
"name": "alertname",
"value": alert.event
},
{
"name": "instance",
"value": alert.resource
}
],
"startsAt": datetime.datetime.utcnow().replace(microsecond=0).isoformat() + ".000Z",
"endsAt": (datetime.datetime.utcnow() + datetime.timedelta(seconds=silence_seconds))
.replace(microsecond=0).isoformat() + ".000Z",
"createdBy": "alerta",
"comment": text if text != '' else "silenced by alerta"
}
# if alertmanager is clustered behind a load balancer that mirrors requests we should prefer to create one silence
# rather than many
if ALERTMANAGER_USE_EXTERNALURL_FOR_SILENCES:
base_url = alert.attributes.get('externalUrl', DEFAULT_ALERTMANAGER_API_URL) or ALERTMANAGER_API_URL
else:
base_url = ALERTMANAGER_API_URL or alert.attributes.get('externalUrl', DEFAULT_ALERTMANAGER_API_URL)
url = base_url + '/api/v1/silences'
try:
r = requests.post(url, json=data, 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)
# example r={"status":"success","data":{"silenceId":8}}
try:
data = r.json().get('data', [])
if data:
silenceId = data['silenceId']
alert.attributes['silenceId'] = silenceId
else:
silenceId = alert.attributes.get('silenceId', "unknown")
text = text + ' (silenced in Alertmanager)'
except Exception as e:
raise RuntimeError("Alertmanager: ERROR - %s" % e)
LOG.debug('Alertmanager: Added silenceId %s to attributes', silenceId)
elif action == 'unack':
LOG.debug('Alertmanager: Remove silence for alertname=%s instance=%s', alert.event, alert.resource)
silenceId = alert.attributes.get('silenceId', None)
if silenceId:
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