[scenario-16 hermes] alice writes M1 tier=short on node-1
[scenario-16 hermes]   M1 id=87a78de8-7abb-45a9-b8c9-8c020ca4121a
[scenario-16 hermes] alice promotes M1 to tier=long
[scenario-16 hermes]   promote returned HTTP 200
[scenario-16 hermes] bob reads M1 on node-2 and checks tier
[scenario-16 hermes]   bob sees tier=long (expected long)