From the article:
With Grafana OnCall’s automatic grouping of alerts within Slack, you can avoid alert storms and reduce the noise your teams are exposed to during an incident.
Seems like the same feature described using different terminology.
What happens if you get 1000 API calls about "Alert 1" and 1 API call about "Alert 2".
You want both on call's to trigger once, but will alert 2 get though?