alertmanager: child route question

[kiran]

Hello all,

In alertmanager.yml file, is match or match_re mandatory in child route/s?

I want to add email , slack and pagerduty in child routes and want to send all alerts(without matching anything) to all 3 routes. So in this case, I don't need to match anything, but was not sure if match or match_re is mandotory and if so how to handle this scenario. Is this a valid alert manager configuration?:

route:
  group_by: [job]
  group_wait: 30s
  group_interval: 5m
  repeat_interval: 1h
  receiver: fallback_email
  continue: true

  # The child route trees.
  routes:
    - receiver: 'email_client'
      group_by: [job, service]
      continue: true
   
    - receiver: 'slack_client'
      group_by: [app, job, service]
      continue: true
   
    - receiver: 'pagerduty_client'
      group_by: [app]