Feature Req: Trigger alert if any of the match_re(or match) matches.

Alertmanager > routes > match_re > CAN we Trigger Alert if ANY match_re condition matches?

I have two kinds of alerts;

1. 1st one has a namespace label but doesn't team_tag label
2. 2nd one has a team_tag label but doesn't have a namespace label

I want to catch both kinds of alerts in ONE receiver. The below route is just for one team like this we have N teams.

routes:
- receiver: 'devops-critical'
  match:
    severity: 'critical'
  match_re:
    # ---> WANT TO TRIGGER ALERT IF namespace OR team_tag regex matches
    namespace: '(ingress-nginx|istio-.*|keda|kube-.*|logging|loki|)'
    team_tag: '(devops-tools)'

Thought possible solutions

1. I can add two receiver pointing to same the same endpoint(slack channel/teams/email...) and use them to check separately once for namespace and once for team_tag. But this will result in duplication.
2. I can maybe use alert_relabel_configs on the Prometheus side to inject dummy values either when namespace or team_tag is missing and append that dummy value to in above regex. But this will increase complexity on others SREs.

Start with Alertmanager route matching and the routes, match, and match_re configuration described in the issue. Determine how matching currently combines multiple match_re labels, then define tests showing that namespace OR team_tag can select one receiver without duplicate notifications. Done means the behavior and configuration semantics are covered by tests and documented.