The description of a dynamic collection of monitored resources. Each group has a filter that is matched against monitored resources and their associated metadata. If a group's filter matches an available monitored resource, then that resource is a member of that group. Groups can contain any number of monitored resources, and each monitored resource can be a member of any number of groups.
Groups can be nested in parent-child hierarchies. The parentName
field identifies an optional parent for each group. If a group has a
parent, then the only monitored resources available to be matched by the
group's filter are the resources contained in the parent group. In other
words, a group contains the monitored resources that match its filter
and the filters of all the group's ancestors. A group without a parent
can contain any monitored resource.
For example, consider an infrastructure running a set of instances with
two user-defined tags: "environment" and "role". A parent group
has a filter, environment="production". A child of that parent group
has a filter, role="transcoder". The parent group contains all
instances in the production environment, regardless of their roles. The
child group contains instances that have the transcoder role and are
in the production environment.
The monitored resources contained in a group can change at any moment, depending on what resources exist and what filters are associated with the group and its ancestors.
A user-assigned name for this group, used only for display purposes.
The filter used to determine which monitored resources belong to this group.