oncePer support for Argo Rollouts Notifications

[jnguy2018]

Hello! I'm attempting to use the oncePer config for Slack notifications, but I can't get it to work 😢 . My argo-rollouts-notification-configmap is configured as so, and my intended behavior is that upon triggering a rollout, there shouldn't be any subsequent notifications past the first one since the rollout.metadata.name is set between rollouts:

  trigger.on-rollout-updated: |
    - send: [rollout-updated]
    - oncePer: rollout.metadata.name (set value to test the oncePer feature)

I've also taken a look at a couple discussion posts with mentions of oncePer. I noticed that @zachaller has responded to a couple posts, if you had some insight that would be awesome.

Thanks in advance!