webhook_config for watchdog from alertmanager

gistfile1.txt

(openshift 4.3)
To configure a webhook_config for Watchdog of Alertmanager we have to adjust the secret alertmanager.yml.

# oc -n openshift-monitoring get secret alertmanager-main --template='{{ index .data "alertmanager.yaml" }}' | base64 -d > alertmanager.yaml

And then change alertmanager.yml into

global:
  resolve_timeout: 5m
route:
  group_wait: 30s
  group_interval: 5m
  repeat_interval: 12h
  receiver: 'default'
  routes:
  - match:
      alertname: 'Watchdog'
    repeat_interval: 5m
    receiver: 'watchdog'
receivers:
- name: 'default'
- name: 'watchdog'
  webhook_configs:
  - url: 'http://nagios.example.com:8000/'
  
 
 And then replace alertmanager secret config
 # oc -n openshift-monitoring create secret generic alertmanager-main --from-file=alertmanager.yaml --dry-run -o=yaml |  oc -n openshift-monitoring replace secret --filename=-
 
 tip: webhook_configs is not a typo, it must be plural.