Provide CloudEvents around the management of EventSources resources

[tomkerkhove]

Proposal

Event Types

• keda.eventsource.created.v1
• keda.eventsource.updated.v1
• keda.eventsource.removed.v1

Payload:

{
    "specversion" : "1.0",
    "type" : "keda.eventsource.created.v1",
    "subject" : "/{kubernetes-cluster-name}/{namespace}/event-sinks/{resource-name}/",
    "time" : "2018-04-05T17:31:00Z",
    "datacontenttype" : "application/json",
    "data" : {
      "destination": {
         "webhook": {
           "uri": "http://foo.bar",
        },
      },
      "eventSubscription": {
        "excludedEventTypes": [
          "keda.example.event.1",
          "keda.example.event.1",
        ]
      }
   }
}

Use-Case

Allow end-users to react to changes to their EventSources.

Anything else?

Relates to #479