roachtest: perturbation/full/addNode failed

roachtest.perturbation/full/addNode [failed](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_RoachtestNightlyGceBazel/18955444?buildTab=log) with [artifacts](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_RoachtestNightlyGceBazel/18955444?buildTab=artifacts#/perturbation/full/addNode) on release-25.1.1-rc @ [9041a5d800f253e1fe6a87516a20d63c68c42519](https://github.com/cockroachdb/cockroach/commits/9041a5d800f253e1fe6a87516a20d63c68c42519):

```
(assertions.go:363).Fail:
Error Trace: pkg/cmd/roachtest/tests/perturbation/framework.go:673
pkg/cmd/roachtest/test_runner.go:1318
src/runtime/asm_amd64.s:1695
Error: Should be true
Test: perturbation/full/addNode
Messages: FAILURE: follower-read : Increase 7.7478 > 5.0000 BASE: 6.017184ms SCORE: 46.619779ms

FAILURE: read : Increase 6.1882 > 5.0000 BASE: 6.038205ms SCORE: 37.365676ms

FAILURE: write : Increase 9.8450 > 5.0000 BASE: 9.315671ms SCORE: 91.712596ms
(require.go:1950).True: FailNow called
test artifacts and logs in: /artifacts/perturbation/full/addNode/run_1
```

Parameters:
- acMode=defaultOption
- arch=amd64
- blockSize=4096
- cloud=gce
- coverageBuild=false
- cpu=16
- diskBandwidthLimit=0
- disks=2
- encrypted=false
- fillDuration=10m0s
- fs=ext4
- leaseType=epoch
- localSSD=true
- mem=standard
- numNodes=12
- numWorkloadNodes=1
- perturbationDuration=10m0s
- ratioOfMax=0.5
- runtimeAssertionsBuild=false
- seed=0
- splits=10000
- ssd=2
- validationDuration=5m0s
- vcpu=16
Help

See: [roachtest README](https://github.com/cockroachdb/cockroach/blob/master/pkg/cmd/roachtest/README.md)

See: [How To Investigate \(internal\)](https://cockroachlabs.atlassian.net/l/c/SSSBr8c7)

See: [Grafana](https://go.crdb.dev/roachtest-grafana/teamcity-18955444/perturbation-full-addnode/1740741570912/1740743823867)

Same failure on other branches

- #140671 roachtest: perturbation/full/addNode failed [A-testing C-bug C-test-failure O-perturbation O-roachtest O-robot P-3 T-kv branch-release-25.1]

/cc @cockroachdb/kv-triage

[This test on roachdash](https://roachdash.crdb.dev/?filter=status:open%20t:.*perturbation/full/addNode.*&sort=title+created&display=lastcommented+project) | [Improve this report!](https://github.com/cockroachdb/cockroach/tree/master/pkg/cmd/bazci/githubpost/issues)

Jira issue: CRDB-48173

Start with the failure in pkg/cmd/roachtest/tests/perturbation/framework.go:673 and inspect the TeamCity logs and artifacts for perturbation/full/addNode. Compare the repeated failure referenced in #140671 and consult the roachtest README and Grafana link. Done means identifying and addressing the cause so the test no longer exceeds its latency-increase thresholds.

Written by the indexing model from the issue text.