This commit updates /api/v2/alerts/groups to show if an alert is
suppressed from one or more active or mute time intervals. While
the muted by field can be found in /api/v2/alerts, it is not
used here because /api/v2/alerts does not take aggregation
or routing into consideration.
It also updates the UI to support filtering muted alerts via the
Muted checkbox.
Signed-off-by: George Robinson <george.robinson@grafana.com>
5979dff9dc