The documentation in the MCO repo on supported extensions does not match the experienced functionality for 4.17.

4.17/4.18

Always

    1. Start a 4.17.x cluster.
    2. Apply a MC to install the sysstat extension.
apiVersion: machineconfiguration.openshift.io/v1
kind: MachineConfig
metadata:
  labels:
    machineconfiguration.openshift.io/role: worker
  name: 80-worker-extensions
spec:
  config:
    ignition:
      version: 3.2.0
  extensions:
    - sysstat
    3. Wait for the MCP targeted by the MC in step 2 to degrade & check the reason in the controller logs.
Degraded Machine: ip-10-0-21-15.us-west-2.compute.internal and Degraded Reason: invalid extensions found: [sysstat]

Applying an MC to install sysstat results in a degraded MCP.

Documentation in the MCO repo suggests that `sysstat` is supported for OCP version 4.17. Either the extension should be supported in 4.17 or the documentation should be updated to indicate the correct version where support was added.