gyfora opened a new pull request, #550:
URL: https://github.com/apache/flink-kubernetes-operator/pull/550
## What is the purpose of the change
While the current health probe mechanism is able to detect different types
of errors like startup / informer issues it can be generally beneficial to
allow a simply canary mechanism that can verify that the operator recieives
updates and reconciles resources in a timely manner.
This PR introduces a simple canary mechanism that allows platform
admins/users to deploy simple canary resources identified by a special label.
The canary resource reconciliation logic then feeds into the Health probe
through a configurable timeout which will be able to detect if the operator did
not reconcile the resource.
The canary resource won't deploy any Flink resources.
## Brief change log
- *Add canary resource logic and canary resource manager to handle
timeouts*
- *Wire canary logic into HealthProbe*
- *Add unit tests*
## Verifying this change
HealthProbe test has been extended with canary specific logic.
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): no
- The public API, i.e., is any changes to the `CustomResourceDescriptors`:
no
- Core observer or reconciler logic that is regularly executed: no
## Documentation
- Does this pull request introduce a new feature? yes
- If yes, how is the feature documented? [TODO]
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