prisma-risk / tsoracle / 26471939262
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test(kube-e2e): add dynamic-membership soak (add-learner / promote / remove under soak) (#487) (#511)

test(kube-e2e): add dynamic-membership soak (issue #487)

Adds a new kube-e2e cell that exercises the AdminService + `tsoracle admin`
CLI shipped in #453 end-to-end: scale the StatefulSet from 3 to 4, run
`tsoracle admin add-learner` against the leader (the blocking openraft API
returns only after the learner has caught up to the committed index),
`promote` the new node, then `remove` a non-leader voter — all while a soak
Job sustains GetTs load and enforces the same zero-monotonicity-violation
+ <0.5% error-rate invariants the graceful soak uses.

First end-to-end exercise of the three-address membership model (raft /
service / admin) in a real Kubernetes deployment.

Driver:
* New `Mode::MembershipSoak` with distinct sentinel
  `"membership-soak: first GetTs ok"` and graceful-budget error tolerance.

Manifest:
* New `e2e/kube/driver/job-membership-soak.yaml`, 180s duration with the
  three original replica endpoints (tsoracle-3 reaches the client via
  leader-hint after promote).

Orchestrator:
* New step 5 in `e2e/kube/run-assertions.sh` driving all admin calls via
  `kubectl exec LEADER_POD -- tsoracle admin ... --endpoint
  http://127.0.0.1:51002` (the chart's loopback-only admin bind).
* New `pick_remove_target EXCLUDE_ID` helper in `_assertions_lib.sh` that
  awk-parses `tsoracle admin members` and prints the first non-leader,
  non-excluded Voter id — used to pick the `remove` target without
  triggering an election.

Cluster sizing:
* `kind-config.yaml` grows from 3 → 4 workers. The chart's
  `requiredDuringSchedulingIgnoredDuringExecution` anti-affinity needs one
  node per replica; with only 3 workers tsoracle-3 sits Pending with
  `FailedScheduling: didn't match pod anti-affinity rules` and the rollout
  status times out before step 5 can call `add-learner`.

openraft-only: paxos returns `AdminError::Unsupported`. A future driver-
matrixe... (continued)

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