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This article mainly explains "what is the use of Events in Kubernetes API design". The content of the explanation in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "what is the use of Events in Kubernetes API design"?

Guide reading

When designing API extensions and implementing their controllers, how to design events and status? What kind of information needs to be put into status and what kind of information needs to be put into events?

Event design convention

Event is originally designed to provide a supplement to status, and unlike status, event can provide historical information. Like status, event is also maintained by the controller. So when do I need to report event? What information do you need to report?

When the controller observes a state (normal or abnormal state) of a resource, it needs to report an event if it requires the attention of the user or administrator. Reported events, which usually contain three pieces of information:

Reason: event name

Type: event type (or event level), which can be "Normal" or "Warning"

Message: event description details

Currently, only Normal and Warning are available for event types, and new types, such as Critical, can be extended to represent more serious information in the future if necessary. Event names are represented in hump style. Keep the names short but informative. Avoid minimalist names such as "Failed" or at least "xxxFailed" to indicate what went wrong.

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