roachtest: cluster_creation failed

roachtest.cluster_creation [failed](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_RoachtestNightlyAwsBazel/21275140?buildTab=log) with [artifacts](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_RoachtestNightlyAwsBazel/21275140?buildTab=artifacts#/ycsb/D/nodes=3/cpu=32/isolation-level=read-committed) on release-25.2.16-rc @ [e6a7db89cfedb398e1b17a8af01a4ee3b96e2e3e](https://github.com/cockroachdb/cockroach/commits/e6a7db89cfedb398e1b17a8af01a4ee3b96e2e3e):

```
test ycsb/D/nodes=3/cpu=32/isolation-level=read-committed failed: (test_runner.go:840).func4: in provider: aws: failed to run: aws ec2 run-instances --associate-public-ip-address --count 1 --instance-type c7g.8xlarge --image-id ami-05983a09f7dc1c18f --key-name teamcity-runner-pVoV8zCwtDuyR24qYrV80FD8cpc= --region us-east-2 --security-group-ids sg-04d72b57e29d671f1 --subnet-id subnet-0258dc9d1b6473d84 --tag-specifications ResourceType=instance,Tags=[{Key=usage,Value=roachtest},{Key=roachtest-branch,Value=release-25-2-16-rc},{Key=lifetime,Value=12h0m0s},{Key=arch,Value=arm64},{Key=created,Value=2026-03-20T07:15:38Z},{Key=Name,Value=teamcity-21275140-1773985277-84-n4cpu32-0004},{Key=Cluster,Value=teamcity-21275140-1773985277-84-n4cpu32},{Key=spot,Value=true},{Key=roachprod,Value=true},{Key=cluster,Value=teamcity-21275140-1773985277-84-n4cpu32}] ResourceType=volume,Tags=[{Key=usage,Value=roachtest},{Key=roachtest-branch,Value=release-25-2-16-rc},{Key=lifetime,Value=12h0m0s},{Key=arch,Value=arm64},{Key=created,Value=2026-03-20T07:15:38Z},{Key=Name,Value=teamcity-21275140-1773985277-84-n4cpu32-0004},{Key=Cluster,Value=teamcity-21275140-1773985277-84-n4cpu32},{Key=spot,Value=true},{Key=roachprod,Value=true},{Key=cluster,Value=teamcity-21275140-1773985277-84-n4cpu32}] --user-data file:///tmp/aws-startup-script752016096 --iam-instance-profile Name=roachprod-testing --block-device-mapping file:///tmp/aws-block-device-mapping2731562020 --instance-market-options MarketType=spot,SpotOptions={SpotInstanceType=one-time,InstanceInterruptionBehavior=terminate} --output json: stderr:
An error occurred (InsufficientInstanceCapacity) when calling the RunInstances operation (reached max retries: 2): We currently do not have sufficient c7g.8xlarge capacity in the Availability Zone you requested (us-east-2a). Our system will be working on provisioning additional capacity. You can currently get c7g.8xlarge capacity by not specifying an Availability Zone in your request or choosing us-east-2b, us-east-2c.: exit status 254 [owner=test-eng]
```

Parameters:
- cloud=aws
- coverageBuild=false
- cpu=32
- diskCount=0
- runtimeAssertionsBuild=false
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)

Same failure on other branches

- #166255 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-25.2]
- #166254 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-master]
- #166139 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-26.1.2-rc]
- #166137 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-25.4.7-rc]
- #166135 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-24.3.30-rc]
- #165927 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-26.1]
- #165926 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-26.1]
- #165925 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-26.1]
- #165924 roachtest: cluster_creation failed [O-roachtest O-robot O-rsg T-testeng X-infra-flake branch-release-26.1]

/cc @cockroachdb/test-eng

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

Jira issue: CRDB-61817