[scenario-16 hermes] alice writes M1 tier=short on node-1
[scenario-16 hermes]   M1 id=f7e9841a-80b1-4c34-9a57-f3ef8fc50b4d
[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)