Prometheus AlertManager - Send Alerts to different clients based on routes

Question

I have 2 services A and B which I want to monitor. Also I have 2 different notification channels X and Y in the form of receivers in the AlertManager config file.

I want to send to notify X if service A goes down and want to notify Y if service B goes down. How can I achieve this my configuration?

My AlertManager YAML file is:

route:
  receiver: X

receivers:
  - name: X
    email_configs:

  - name: Y
    email_configs:

And alert.rule files is:

groups:

- name: A
  rules:
    - alert: A_down
      expr: expression
      for: 1m
      labels:
         severity: critical
      annotations:
         summary: "A is down"

- name: B
  rules:
    - alert: B_down
      expr: expression
      for: 1m
      labels:
        severity: warning
      annotations:
        summary: "B is down"

Answer 1

The config should roughly look like this (not tested):

    route:
      group_wait: 30s
      group_interval: 5m
      repeat_interval: 2h

      receiver: 'default-receiver'

      routes:
      - match:
          alertname: A_down
        receiver: X
      - match:
          alertname: B_down
        receiver: Y

The idea is, that each [`route`](https://prometheus.io/docs/alerting/configuration/#%3Croute%3E) field can has a `routes` field, where you can put a different config, that gets enabled if the labels in `match` match the condition.