values.yaml

# https://github.com/prometheus-community/helm-charts/blob/main/charts/kube-prometheus-stack/values.yaml#L140
# helm upgrade monitoring prometheus-community/kube-prometheus-stack -f values-prom.yaml
alertmanager:
  config:
    global:
      resolve_timeout: 5m
    inhibit_rules:
      - source_matchers:
          - 'severity = critical'
        target_matchers:
          - 'severity =~ warning|info'
        equal:
          - 'namespace'
          - 'alertname'
      - source_matchers:
          - 'severity = warning'
        target_matchers:
          - 'severity = info'
        equal:
          - 'namespace'
          - 'alertname'
      - source_matchers:
          - 'alertname = InfoInhibitor'
        target_matchers:
          - 'severity = info'
        equal:
          - 'namespace'
    route:
      group_by: [ 'namespace' ]
      group_wait: 30s
      group_interval: 5m
      repeat_interval: 12h
      receiver: 'null'
      routes:
        - receiver: 'null'
          matchers:
            - alertname =~ "InfoInhibitor|Watchdog"
        - receiver: synthetics-alerts
          group_by: [ '...' ]
          match_re:
            namespace: kuberhealthy
    receivers:
      - name: 'null'
      - name: synthetics-alerts
        slack_configs:
          - channel: alerts
            send_resolved: true
            title: '[{{ .Status | toUpper }}{{ if eq .Status "firing" }}:{{ .Alerts.Firing | len }}{{ end }}] Monitoring Event Notification'
            text: >-
              {{ range .Alerts }}
                *Alert:* {{ .Annotations.summary }} - `{{ .Labels.severity }}`
                *Description:* {{ .Annotations.description }}
                *Details:*
                {{ range .Labels.SortedPairs }} • *{{ .Name }}:* `{{ .Value }}`
                {{ end }}
              {{ end }}
            api_url: >-
              https://hooks.slack.com/services/...
    templates:
      - '/etc/alertmanager/config/*.tmpl'