stable operator API

[pohly]

Currently the operator is considered "alpha" (https://github.com/intel/pmem-csi/blob/devel/README.md#feature-status).

Before we can commit to maintaining a stable API, we need to:

• revise the status (operator API v1alpha2: revise Status #611)
• enable per-container resource specs (operator: per-container resource spec #616) and set reasonable defaults (prevent CSI driver from being evicted #261)
• revise certificate API (operator API: replace embedded certificates with references to secrets #759, operator: rename object Deployment name #814)
• finalize the operator installation procedure (operator: stop creating CRD #761)
• test up- and downgrade scenarios

Once we are done, we need to change the channel in Operator Hub from alpha to beta.

[avalluri]

@pohly I think all the listed issues got addressed, Do you still have any in your mind before closing this and calling the operator API is stable?

[pohly]

Where do we have up- and downgrade tests?

What I meant with "test up- and downgrade scenarios", I meant installing one version of the operator, deploying a driver, and then updating resp. downgrading the operator.

[avalluri]

Where do we have up- and downgrade tests?

I was mistaken, we have this for the driver but not the operator.

What I meant with "test up- and downgrade scenarios", I meant installing one version of the operator, deploying a driver, and then updating resp. downgrading the operator.

Currently, we cannot support this as our v1beta1 CRD API is not backward compatible. Probably we should target this post 0.9 release, what do you think?

[pohly]

It feels too early to define a new API in 0.9.0 and immediately declare it "stable" without any outside feedback - that will prevent all future backwards incompatible changes or at least make them more difficult.

With that in mind I think we should move this issue to 1.0.

[avalluri]

Operator downgrade is not supported by the OLM hence we can't test that using OLM. Other than this all others listed in this issue are fixed.