Use static list of keys in model

[serathius]

                                                      │  old.bench   │             new2.bench              │
                                                      │    sec/op    │   sec/op     vs base                │
ValidateLinearizableOperations/Successes-12             1128.6µ ± 1%   874.9µ ± 2%  -22.48% (p=0.000 n=10)
ValidateLinearizableOperations/AllFailures-12            355.5µ ± 1%   171.6µ ± 3%  -51.73% (p=0.000 n=10)
ValidateLinearizableOperations/PutFailuresWithRead-12    242.5µ ± 1%   194.9µ ± 5%  -19.64% (p=0.000 n=10)
geomean                                                  459.9µ        308.1µ       -33.01%

[k8s-ci-robot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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[k8s-ci-robot]

PR needs rebase.

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[k8s-ci-robot]

@serathius: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci-etcd-robustness-release34-amd64	375808c	link	true	/test ci-etcd-robustness-release34-amd64
ci-etcd-robustness-release36-amd64	375808c	link	true	/test ci-etcd-robustness-release36-amd64

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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