Update UI with improved notifications (#286)

* Nats backend notification

* First try: human-readable info

* Add callout warning when NATS unavailable

* Add alert for empty backend

* Add empty backend sample
Improve visibility of alerts

config/samples/empty_backend.yaml

@@ -0,0 +1,22 @@
+apiVersion: operator.kyma-project.io/v1alpha1
+kind: Eventing
+metadata:
+  labels:
+    app.kubernetes.io/name: eventing
+    app.kubernetes.io/instance: eventing
+    app.kubernetes.io/part-of: eventing-manager
+    app.kubernetes.io/created-by: eventing-manager
+  name: eventing
+  namespace: kyma-system
+spec:
+  publisher:
+    replicas:
+      min: 2
+      max: 2
+    resources:
+      limits:
+        cpu: 500m
+        memory: 512Mi
+      requests:
+        cpu: 40m
+        memory: 64Mi

config/ui-extensions/eventing/details

@@ -25,6 +25,14 @@ body:
       - source: '$readableTimestamp(lastTransitionTime)'
         name: Last transition
         sort: true
+  - source: "'NATS unavailable: If you chose the NATS backend, you must enable the NATS module.'"
+    widget: Alert
+    severity: warning
+    visibility: "$exists(status.conditions[reason = 'NATSUnavailable'])"
+  - source: "'No backend: If you enable the Eventing module, you must configure a backend.'"
+    widget: Alert
+    severity: warning
+    visibility: "$exists(status.conditions[reason = 'BackendNotSpecified'])"
   - name: Events
     widget: EventList
     filter: '$matchEvents($$, $root.kind, $root.metadata.name)'

config/ui-extensions/eventing/form

@@ -7,6 +7,12 @@
     - EventMesh
   description: Choose a backend type from the dropdown.
 
+- simple: true
+  widget: Alert
+  severity: info
+  alert: "'If you choose the NATS backend, you must enable the NATS module.'"
+  visibility: "spec.backend.type = 'NATS'"
+
 - path: spec.backend.config.eventMeshSecret
   visibility: "spec.backend.type = 'EventMesh'"
   widget: ResourceRef

config/ui-extensions/eventing/kustomization.yaml

@@ -1,6 +1,6 @@
 configMapGenerator:
   - name: eventings.operator.kyma-project.io
-    namespace: kube-public
+    namespace: kyma-system
     files:
       - general
       - form