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Kubernetes Events

Kong Ingress Controller provides Kubernetes Events to help understand the state of your system. Events occur when an invalid configuration is rejected by Kong Gateway (KongConfigurationApplyFailed) or when an invalid configuration such as an upstream service that does not exist is detected (KongConfigurationTranslationFailed).

The Events are not cleared immediately after you resolve the issues. However, the Event count stops increasing after you fix the problem. Events do eventually expire after an hour, by default, but may be outdated.

Emitted Events

All the events emitted by Kong Ingress Controller are listed in the table below.

Finding problem resource Events

Once you see a translation or configuration push failure, you can locate which Kubernetes resources require changes by searching for Events. For example, this Ingress attempts to create a gRPC route that also uses HTTP methods, which is impossible:

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  annotations:
    konghq.com/methods: GET
    konghq.com/protocols: grpcs
    kubernetes.io/ingress.class: kong
  name: httpbin
spec:
  rules:
  - http:
      paths:
      - backend:
          service:
            name: httpbin
            port:
              number: 80
        path: /bar
        pathType: Prefix

Kong Gateway rejects the route that Kong Ingress Controller creates from this Ingress and return an error. Kong Ingress Controller processes this error and create a Kubernetes Event linked to the Ingress.

You can find these Events by searching across all namespaces for Events with the reason that indicate Kong Ingress Controller failures:

kubectl get events -A --field-selector='reason=KongConfigurationApplyFailed'

The results should look like this:

NAMESPACE   LAST SEEN   TYPE      REASON                         OBJECT            MESSAGE
default     35m         Warning   KongConfigurationApplyFailed   ingress/httpbin   invalid methods: cannot set 'methods' when 'protocols' is 'grpc' or 'grpcs'

The controller can also create Events with the reason KongConfigurationTranslationFailed when it detects issues before sending configuration to Kong.

The complete Event contains additional information about the problem resource, the number of times the problem occurred, and when it occurred:

apiVersion: v1
kind: Event
count: 1
firstTimestamp: "2023-02-21T22:42:48Z"
involvedObject:
  apiVersion: networking.k8s.io/v1
  kind: Ingress
  name: httpbin
  namespace: default
kind: Event
lastTimestamp: "2023-02-21T22:42:48Z"
message: 'invalid methods: cannot set ''methods'' when ''protocols'' is ''grpc''
  or ''grpcs'''
metadata:
  name: httpbin.1745f83aefeb8dde
  namespace: default
reason: KongConfigurationApplyFailed
reportingComponent: ""
reportingInstance: ""
source:
  component: kong-client
type: Warning

Kong Ingress Controller creates one Event for each problem with a resource, so you may see multiple Events for a single resource with different messages. The message describes the reason the resource is invalid. In this case, it’s because gRPC routes cannot use HTTP methods.

Events for cluster scoped resources

Kubernetes events are namespaced and created in the same namespace as the involved object. Cluster scoped objects are handled differently because they aren’t assigned to a particular namespace.

kubectl and Kubernetes libraries, like client-go, assign the default namespace to events that involve cluster scoped resources.

For example, if you defined the following KongClusterPlugin, which has an incorrect schema:

apiVersion: configuration.konghq.com/v1
kind: KongClusterPlugin
config:
  config:
    latency_metrics: true
metadata:
  annotations:
    kubernetes.io/ingress.class: kong
  labels:
    global: "true"
  name: prometheus
plugin: prometheus

You can find the relevant event in the default namespace using the following kubectl command:

kubectl get events --field-selector involvedObject.name=prometheus -n default

This could output the following:

LAST SEEN   TYPE      REASON                         OBJECT                         MESSAGE
2s          Warning   KongConfigurationApplyFailed   kongclusterplugin/prometheus   invalid config.config: unknown field