Help understanding Alertmanager configuration

[nsmeds]

There's two settings I've been reading about but still hope to find some clarification on:

`group_by`

`inhibit_rule`

Someone else has configured these settings for our servers, however I don't quite understand the logic behind it.

prometheus::alertmanager::inhibit_rules:

  - source_match:

      severity: 'critical'

    target_match:

      severity: 'warning'

    equal:

      - 'alertname'

      - 'role'

      - 'service'

      - 'stack'

      - 'domain'

      - 'realm'

Just to confirm, with the above `inhibit_rules` settings: only if all matchers match (same alertname, role, etc.) will the severity: warning alert be silenced? I ask because many of our instances still do not have the stack label associated with them.

prometheus::alertmanager::route:

  group_by:

    - 'alertname'

    - 'role'

    - 'service'

    - 'stack'

    - 'domain'

    - 'realm'

Similar to the above: do ALL label names have to match for alerts to be grouped together?