alertmanager.yml

global:
  resolve_timeout: 5m
  slack_api_url: 'https://hooks.slack.com/services/YOUR/SLACK/WEBHOOK'

route:
  group_by: ['alertname', 'cluster', 'service']
  group_wait: 30s
  group_interval: 5m
  repeat_interval: 4h
  receiver: 'slack-notifications'

receivers:
  - name: 'slack-notifications'
    slack_configs:
      - channel: '#alerts'
        send_resolved: true
        title: '{{ template "slack.default.title" . }}'
        text: '{{ template "slack.default.text" . }}'
        title_link: '{{ template "slack.default.titlelink" . }}'
        footer: '{{ template "slack.default.footer" . }}'

templates:
  - '/etc/alertmanager/template/*.tmpl'

inhibit_rules:
  - source_match:
      severity: 'critical'
    target_match:
      severity: 'warning'
    equal: ['alertname', 'cluster', 'service']