We have removed direct support for dashboards from heartbeat. That command will return an error in 7.3. That it doesn't is a 7.2 bug.
We now recommend favoring the new Uptime app in Kibana.
You can still use the dashboard in 7.x, but you'll need to load the dashboard manually. Visit https://github.com/elastic/uptime-contrib for more info on loading the dashboard.
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