roachtest: cluster_creation failed

roachtest.cluster_creation [failed](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_RoachtestNightlyAwsBazel/20308639?buildTab=log) with [artifacts](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_RoachtestNightlyAwsBazel/20308639?buildTab=artifacts#/kv0/enc=false/nodes=1/size=64kb/conc=4096) on release-24.3.18-rc @ [070aa784b97d56970e90734d24c15e057000cdd0](https://github.com/cockroachdb/cockroach/commits/070aa784b97d56970e90734d24c15e057000cdd0):

```
test kv0/enc=false/nodes=1/size=64kb/conc=4096 failed: (test_runner.go:829).func4: in provider: aws: failed to run: aws ec2 run-instances --associate-public-ip-address --count 1 --instance-type m6id.2xlarge --image-id ami-0e83be366243f524a --key-name teamcity-runner-73kcEzNuAO7UH3EVJ1ZyAsCtb1w= --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-24-3-18-rc},{Key=Spot,Value=true},{Key=Roachprod,Value=true},{Key=Cluster,Value=teamcity-20308639-1754544819-20-n2cpu8},{Key=Lifetime,Value=12h0m0s},{Key=arch,Value=amd64},{Key=Created,Value=2025-08-07T05:55:28Z},{Key=Name,Value=teamcity-20308639-1754544819-20-n2cpu8-0001}] ResourceType=volume,Tags=[{Key=usage,Value=roachtest},{Key=roachtest-branch,Value=release-24-3-18-rc},{Key=Spot,Value=true},{Key=Roachprod,Value=true},{Key=Cluster,Value=teamcity-20308639-1754544819-20-n2cpu8},{Key=Lifetime,Value=12h0m0s},{Key=arch,Value=amd64},{Key=Created,Value=2025-08-07T05:55:28Z},{Key=Name,Value=teamcity-20308639-1754544819-20-n2cpu8-0001}] --user-data file:///tmp/aws-startup-script952729479 --iam-instance-profile Name=roachprod-testing --block-device-mapping file:///tmp/aws-block-device-mapping4278533055 --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): There is no Spot capacity available that matches your request.: exit status 254 [owner=test-eng]
```

Parameters:
- cloud=aws
- coverageBuild=false
- cpu=8
- runtimeAssertionsBuild=false
- ssd=0
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

- #151390 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-25.3]
- #151389 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-25.3]
- #151388 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-25.3]
- #151387 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-25.3]
- #151242 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-master]
- #151241 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-master]
- #151240 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-master]
- #151239 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-master]
- #151238 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-master]
- #151237 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-master]

/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-53321

Start with the linked TeamCity log and artifacts, then read pkg/cmd/roachtest/README.md to understand cluster creation and AWS provider behavior. Compare the repeated cluster_creation failures listed in this issue and the referenced roachdash results; the report does not specify a code change, so completion would require identifying and addressing the recurring InsufficientInstanceCapacity failure.

Written by the indexing model from the issue text.