Alertmanager routing issue

[dc3o]

I'm seeing issues with alert routing and  trying to diagnose misconfiguration. Maybe someone will have an idea.

```

 alertmanager --version

alertmanager, version 0.21.0 (branch: HEAD, revision: 4c6c03ebfe21009c546e4d1e9b92c371d67c021d)

  build user:       root@dee35927357f

  build date:       20200617-08:54:02

  go version:       go1.14.4

```

```

route:

  group_by:

  - "..."

  group_wait: 3s

  group_interval: 10s

  repeat_interval: 12h

  receiver: alerts-webhook

  routes:

  - match:

      severity: info

    receiver: alerts-webhook

  - match:

      severity: critical

    receiver: pagerduty

  - match:

      severity: warning

    receiver: slack

receivers:

- name: alerts-webhook

  webhook_configs:

  - url: https://alerts-wh.comp.local/api/webhooks/prometheus

    send_resolved: true

  slack_configs:

  - api_url: https://hooks.slack.com/services/xxx/yyy

    channel: "#info"

    send_resolved: true

- name: pagerduty

  pagerduty_configs:

  - service_key: xxxyyyzzz

  webhook_configs:

  - url: https://alerts-wh.comp.local/api/webhooks/prometheus

    send_resolved: true

- name: slack

  slack_configs:

  - api_url: https://hooks.slack.com/services/xxxyyy
    channel: "#warnings"

    send_resolved: true

  webhook_configs:

  - url: https://alerts-wh.comp.local/api/webhooks/prometheus

    send_resolved: true

```

In alertmanager logs I'm expecting all the notification severity info to be sent to alerts-webhook route:

```

sudo journalctl -u alertmanager  | grep 'level=info' | tail -n 100 | awk '{ print $10 }'   

receiver=pagerduty

receiver=pagerduty

receiver=pagerduty

receiver=pagerduty

receiver=pagerduty

receiver=pagerduty

receiver=pagerduty

receiver=pagerduty

receiver=pagerduty

receiver=pagerduty

receiver=slack

receiver=slack

receiver=slack

receiver=pagerduty

receiver=slack

receiver=slack

receiver=slack

receiver=slack

receiver=slack

receiver=pagerduty

receiver=pagerduty

receiver=pagerduty

receiver=pagerduty

receiver=alerts-webhook

receiver=pagerduty

```