Comment 9 for bug 1616825

@Denis, thank you for the bug report.
I think the issue priority should be decreased to Medium because plugins are enabled on your screenshot. Message about not hot-pluggable version is a warning only, it doesn't block enabling and deploying the plugin.
Another question is why this message appears. It is displayed on UI in operational environment and when the chosen plugin version has hot_pluggable: false flag in its metadata.

So, we need to check response of GET /api/clusters/<cluster_id>/attributes to triage the issue.
Could you please provide it?