Merge pull request #7985 from BenTheElder/remove-oncall

remove deprecated sig testing groups

communication/slack-config/restrictions.yaml

@@ -63,7 +63,4 @@ restrictions:
       - "^prow"
       - "^testgrid"
       - "^testing"
-    usergroups:
-      - "^test-infra-oncall$"
-      - "^google-build-admin$"
   - path: "**/*" # prevent any other file from containing anything

communication/slack-config/sig-testing/usergroups.yaml

@@ -1,8 +0,0 @@
-usergroups:
-  # maintained by https://github.com/kubernetes/test-infra/blob/master/experiment/slack-oncall-updater
-  - name: test-infra-oncall
-    external: true
-
-  # maintained by https://github.com/kubernetes/test-infra/blob/master/experiment/slack-oncall-updater
-  - name: google-build-admin
-    external: true