Validator 6 - special case

**VM name:**[ubuntu@172.31.48.45](mailto:ubuntu@172.31.48.45)

- [ ] Setup Prometheus with `CONCORDIUM_NODE_PROMETHEUS_LISTEN_PORT=9090` and also I think `CONCORDIUM_NODE_PROMETHEUS_LISTEN_ADDRESS=0.0.0.0`
- [ ] Setup debug logs
- [ ] Have the node version 8.x.
- [ ] 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.
- [ ] Remove validator - 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.
- [ ] Stake is released at the payday after the cooldown

Start by provisioning the listed Ubuntu VM, configuring Prometheus and debug logs, and running a node on version 8.x. Follow the validator and protocol-update checklist; done means the specified stake transitions, reward cutoff, cooldown, and release behavior are all observed after the update.

Written by the indexing model from the issue text.