Bug 1749469

Created attachment 1612060 [details]
screenshot of events page in OCP Console

Description of problem
======================

There is slight discrepancy between representation of events in web ui (OCP
Console) and rest of the Openshift (command line, yamls, ...).

If you consider this to be done on purpose, feel free to close this bug and
create doc bugs suggesting appropriate enhancements in the documentation.

Version-Release number of selected component
============================================

cluster channel: stable-4.2
cluster version: 4.2.0-0.nightly-2019-09-04-142146
cluster image: registry.svc.ci.openshift.org/ocp/release@sha256:179c6515ec95eba3187120f93f60a102fd34223e57b208906b56bfbf91304f6a

How reproducible
================

1/1

Steps to Reproduce
==================

1. Go to Events page in OCP Console and see event categories there
2. Do the same via REST API or oc command line tool

Actual results
==============

OCP Console (web ui) classifies events into 2 groups:

- Info category
- Error category

On the other hand oc (openshift command line tool) and other places (such as
yaml representation of k8s object), events are classified into:

- Normal type
- Warning type

Error and Warning are usually considered to describe different log levels, so
that the urgency conveyed in the web ui differs a bit compared to the command
line version of the same.

Expected results
================

The event representation is either aligned in both places or explained in the
docs, if there is some reason for this arrangement.

Additional info
===============

This looks like know behavior, but it seems not to be officially explained
nor documented properly.

Full list of event types
------------------------

K8s seems to recognize just Normal and Warning event types:

```
$ find . -name event.go | xargs grep -i warn                                    
./staging/src/k8s.io/client-go/tools/record/event.go:   // 'type' of this event, and can be one of Normal, Warning. New types could be added in future
```

While in the OCP Console (web ui), one sees the full list of Categories (Info,
Error), this is not obvious in the command line output (eg. via `oc get
events`), so at first sight, one could be puzzled whether
the disrepancy is about mapping names or missing event type somewhere.

Related documentation
---------------------

This problem is even visible in the docs:

https://docs.openshift.com/container-platform/4.1/nodes/clusters/nodes-containers-events.html

But there is no:

- Explanation of the discrepancy between event representation in CLI and OCP
  Console, even though the doc describes both.

- Full list of event types (or categories in OCP Console sense) with full
  description, even though there is such list for event "reasons" (such as
  FailedUnMount, FailedMapVolume, ...).