Salt Event System

[thomasdanan]

Component:

'salt', 'ui'

Why this is needed:

Currently, the long operations triggered through the salt API are difficult to follow and are lacking of fine-grained progression or events, that could be consumed from a UI in order to provide more visibility to the IT Generalist. We could also imagine, those events are used to better understand the set of operations that were performed on the cluster.

One example is cluster expansion: when adding a node to the cluster, many different operations are triggered (sys pkgs installation, K8S master or etcd pod scheduling, etc ...). When some issue occurs during one of this step, it is important to have a clear notification on Salt API client-side to ease the understanding and investigation.

What should be done:

Implementation proposal (strongly recommended):

Test plan: