Stripping @labels in karma.conf

[xkilian]

Trying to strip @cluster LABEL for alerts displayed in Karma. @cluster labels always show up in the list of LABELS. Running 0.95 or 0.76, same thing.

• Changing the colour of the cluster LABEL works,
• Adding an alert filter with @cluster or @state works.
• Strip LABEL @cluster does not work

I am not sure what I am doing wrong here.

filters:
  default:
    - "@state=active"
labels:
  color:
    custom:
      "@cluster":
        - value: ALERTMANAGER1
          color: "#ff220c"
  strip:
    - vcenter
    - datastore
    - "@cluster"