How configure graph "Add all your Checkmk servers as monitored hosts to Checkmk to render this graph. Specifically, we are missing the 'Site [SITE] "

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Yeah, the docs are lacking right now.

In short, you need to install the 2.0Px agent via SSH on your ckeck_mk monitoring host.
Then do a full discovery, then add the site_statistics service.

After this, you’ll get the new nice dashboard.