Call handlers for cluster events

[kopf-archiver]

An issue by nolar at 2019-04-02 09:49:57+00:00
Original URL: zalando-incubator/kopf#20
 

Expected Behavior

Some handlers should be called when the cluster events happen, such as the cluster upgrades.

Actual Behavior

Only the objects changes cause the handlers execution.

The objects are not always changed when something else (unmonitored) happens in the cluster or with the cluster.

See also #19

[nolar]

There is no direct way of detecting the cluster events of this kind (upgrades, reboots, etc). This can only be done by indirect observations with frequent polling or watching — e.g., appearance of kind: Node with a newer version in status.nodeInfo.kubeletVersion. If needed, this can be implemented as a separate handler — there is no need to add this as the framework's feature.