Filters are necessary when registering for webhooks since they will control what event payloads are sent to the webhook's endpoint using the eventFilter property. Webhooks use an opt-in style, where only events matching the configured eventFilter will be sent to the destination. If there is only interest in events related to groups and servers, the filter would need to specify just those two resource types.
Each resource can be filtered. For more information, see Available Resources.
Beyond opting in, filters can be used to limit what kinds of events are received from that resource. For example, if there is only interest in Delete operations related to groups, a filter can be created to only receive those events.
- A given webhook must have one non-empty filter.
- Use ODATA style filters. This is consistent with the HPE GreenLake specification.
- See the following table for different filtering operations.
| Property | Description | Example Values | Example eventFilter | Result |
|---|---|---|---|---|
type | Allows matching on resource types | compute-ops/job, compute-ops/server | type eq 'compute-ops/job' | Match all events related to jobs |
operation | Allows matching on different operations | Created, Deleted, Updated | type eq 'compute-ops/alert' and operation eq 'Created | Match all events related to created alerts |
changed | Allows matching on monitorable properties if the value has changed | changed/name, changed/state | type eq 'compute-ops/group' and changed/name eq True | Match any events related to groups whose name property changed |
new | Allows matching on monitorable properties of the current state of the resource | new/complianceStatus, new/isActive | type eq 'compute-ops/group' and new/groupComplianceStatus ne 'Compliant' | Match any events related to groups whose groupComplianceStatus is not currently Compliant |
old | Allows matching on monitorable properties of the previous state of the resource | old/devices, old/settings | type eq 'compute-ops/group' and old/name eq 'Group Name' | Match any events related to a group whose previous name was "Group Name" until the group's name is changed again |
name | Alias for new/name | type eq 'compute-ops/group' and name ne 'New Group' | Match any events related to groups whose current name is not "New Group" |
In most cases, new will accomplish the goals of a filter that matches a specific event property. There is some nuance between how new and old work, but they match similar sets of events. For example, consider if a group is created with the name "Group1" (event 0) and then is updated to be named "Group2" after n events. The filter type eq 'compute-ops/group' and new/name eq 'Group1' will match events 0 through n-1, whereas if we change the filter to use old/name it will match events 1 through n.
| Filter | Description |
|---|---|
type eq 'compute-ops/job' | Match all compute-ops/job events |
type eq 'compute-ops/group' and operation eq 'Deleted' | Match only compute-ops/group deletion events |
type eq 'compute-ops/groups' and contains(name, 'exemplar') | Match all compute-ops/group events which have a name containing "exemplar" |
type eq 'compute-ops/firmware-bundle' and new/isActive eq True | Match all firmware bundle events that have isActive currently set to True |
type eq 'compute-ops/server' and old/hardware/health/summary eq 'OK' and changed/hardware/health/summary eq True | Match any server events whose health summary transitions out of an OK state |
type eq 'compute-ops/server' or type eq 'compute-ops/job' or type eq 'compute-ops/alert' or type eq 'compute-ops/group' or type eq 'compute-ops/server-setting' or type eq 'compute-ops/group/compliance' or type eq 'compute-ops/firmware-bundle' | Match every event |