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 field can has a routes field, where you can put a different config, that gets enabled if the labels in match match the condition.