I use pmm-server:2.2.0 to monitor a couple of percona xtradb clusters. When I switch to the PXC/Galera Cluster Summary view it wil not show any data. I also can not select the clusters in the pulldown 'cluster'. Only none is showed.
However, when I first goto the PXC/Galera Nodes Compare view, select a cluster and switch to the PXC/Galera Node Summary view, then the data is available.
I will show data until I manual want to select a cluster (only none is shown) or until the page is automatically refreshed.
maybe the same as https://jira.percona.com/browse/PMM-5270