Validator 7 - special case

**VM name:** [ubuntu@172.31.16.46](mailto:ubuntu@172.31.16.46)

- [ ] Have the node version 8.x.
- [ ] setup debug logs
- [ ] Setup Prometheus with `CONCORDIUM_NODE_PROMETHEUS_LISTEN_PORT=9090` and also I think `CONCORDIUM_NODE_PROMETHEUS_LISTEN_ADDRESS=0.0.0.0`
- [ ] node catches up
- [ ] Register validator that will have a large stake enough to be finalizer.
- [ ] Make sure that the validator is receiving rewards.
- [ ] Wait several paydays.
- [ ] Reduce validators stake - ensure that validator is in cooldown at the time when PU takes in effect
- [ ] **WAIT FOR PROTOCOL UPDATE**
- [ ] After protocol update verify:
- [ ] Stake goes to pre-pre cooldown
- [ ] Rewards are being received for the next payday but not after that.
- [ ] At the snapshot of the payday, stake is in pre-cooldown.
- [ ] At the payday stake goes to cooldown.
- [ ] Move the stake to delegation to a pool
- [ ] At the next payday:
- [ ] Account is delegating

No source files or automated tests are named. Start with the Ubuntu VM checklist, node debug logging, and Prometheus setup, then run the validator stake and protocol-update scenario. Done means every post-update stake, reward, cooldown, and delegation check is verified.

Written by the indexing model from the issue text.