The alert was just looking at the minimum across integrations. So a
complete failure of one integration would be masked by a still worknig
other integration. With this fix, the `integration` label is retained
(as it was already expected by the `description`), and thus any
failing integration will trigger the alert.
In addition, an `alertmanagerCriticalIntegrationsRegEx` is provided
that allows to mark integrations as critical. Integrations that are
not used to deliver critical alerts, or those that are just there for
auditing and logging purposes can now be configured to only trigger a
warning alert if they fail.
Signed-off-by: beorn7 <beorn@grafana.com>
Björn Rabenstein
Tom Wilkie