alertmanager

```yaml
# alertmanager-config.yaml
apiVersion: monitoring.coreos.com/v1alpha1
kind: AlertmanagerConfig
metadata:
  name: tghook
  namespace: monitoring
  labels:
    alertmanagerConfig: main
spec:
  receivers:
    - name: Critical
      webhookConfigs:
        - url: http://192.168.1.171:9087/alert/-4178612045
          sendResolved: true
  route:
    groupBy: ["namespace"]
    groupWait: 30s
    groupInterval: 5m
    repeatInterval: 12h
    receiver: Critical
    routes:
      - receiver: Critical
        match:
          severity: critical
---
apiVersion: monitoring.coreos.com/v1
kind: PrometheusRule
metadata:
  labels:
    prometheus: k8s
    role: alert-rules
  name: zero-rules
  namespace: monitoring
spec:
  groups:
    - name: gateway
      rules:
        - alert: gatewayUnavailable
          annotations:
            summary: gateway<3
            description: If one more etcd peer goes down the cluster will be unavailable
          expr: |
            count(up{job="gateway"}) < 2
          for: 1m
          labels:
            severity: critical
            namespace: monitoring
```