Metrics: No metrics are being shown even after two contracts have been deployed

I've added the Azure Blockchain Workbench (preview) to my resource group (rg-panren), which contains, apart from others, the Azure Blockchain Service, and an App Service that provides the workbench.

I've placed the https://github.com/Azure-Samples/blockchain/tree/master/blockchain-workbench/application-and-smart-contract-samples/simple-marketplace in the workbench, which works fine. It has 3 members, 5 items created, 2 sold - so a lot of transactions should be available (see screenshots). But I don't see any metrics (no blocks, no CPU usage, no memory usage, nothing.)

I've also created a https://docs.microsoft.com/en-us/azure/blockchain/service/connect-metamask. I increased the balance, decreased it (enhanced version), read it (works fine), but again - no metrics.

What do I need to do to see metrics?