roachtest: cluster_creation failed

roachtest.cluster_creation [failed](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_RoachtestNightlyAwsBazel/21350050?buildTab=log) with [artifacts](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_RoachtestNightlyAwsBazel/21350050?buildTab=artifacts#/cdc/frontier-persistence-benchmark/interval=10m/tables=10000/ranges=1) on release-26.1.5-rc @ [5d80eb1d1ea91cfe92aa79ea3fdd28c1aedda0d4](https://github.com/cockroachdb/cockroach/commits/5d80eb1d1ea91cfe92aa79ea3fdd28c1aedda0d4):

```
test cdc/frontier-persistence-benchmark/interval=10m/tables=10000/ranges=1 failed: (test_runner.go:1003).func4: in provider: aws: failed to run: aws ec2 run-instances --associate-public-ip-address --count 1 --instance-type m6id.4xlarge --image-id ami-0e83be366243f524a --key-name teamcity-runner-_Fr3LYzAMLrsk45pXDHnmeC9IvA= --region us-east-2 --security-group-ids sg-04d72b57e29d671f1 --subnet-id subnet-0e3d146e87ebc5a2c --tag-specifications ResourceType=instance,Tags=[{Key=usage,Value=roachtest},{Key=roachtest-branch,Value=release-26-1-5-rc},{Key=Name,Value=teamcity-21350050-1778920845-14-n4cpu16-0001},{Key=Cluster,Value=teamcity-21350050-1778920845-14-n4cpu16},{Key=spot,Value=true},{Key=roachprod,Value=true},{Key=cluster,Value=teamcity-21350050-1778920845-14-n4cpu16},{Key=lifetime,Value=12h0m0s},{Key=arch,Value=amd64},{Key=created,Value=2026-05-16T08:54:22Z}] ResourceType=volume,Tags=[{Key=usage,Value=roachtest},{Key=roachtest-branch,Value=release-26-1-5-rc},{Key=Name,Value=teamcity-21350050-1778920845-14-n4cpu16-0001},{Key=Cluster,Value=teamcity-21350050-1778920845-14-n4cpu16},{Key=spot,Value=true},{Key=roachprod,Value=true},{Key=cluster,Value=teamcity-21350050-1778920845-14-n4cpu16},{Key=lifetime,Value=12h0m0s},{Key=arch,Value=amd64},{Key=created,Value=2026-05-16T08:54:22Z}] --user-data file:///tmp/aws-startup-script2536109223 --iam-instance-profile Name=roachprod-testing --block-device-mapping file:///tmp/aws-block-device-mapping3390347781 --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 m6id.4xlarge capacity in the Availability Zone you requested (us-east-2b). Our system will be working on provisioning additional capacity. You can currently get m6id.4xlarge capacity by not specifying an Availability Zone in your request or choosing us-east-2a, us-east-2c.: exit status 254 [owner=test-eng]
```

Parameters:
- cloud=aws
- coverageBuild=false
- cpu=16
- 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

- #170424 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-25.4.11-rc]
- #170320 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-25.2.19-rc]
- #169159 roachtest: cluster_creation failed [O-roachtest O-robot O-rsg T-testeng X-infra-flake branch-master]
- #169158 roachtest: cluster_creation failed [O-roachtest O-robot O-rsg T-testeng X-infra-flake branch-master]
- #168569 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-26.1.4-rc]
- #168567 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-25.4.10-rc]
- #168565 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-25.2.18-rc]
- #168562 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-24.3.32-rc]
- #168445 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-26.1.3-rc]

/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-63992

Start with the roachtest README and the failure at test_runner.go:1003, then inspect the reported AWS run-instances command and its InsufficientInstanceCapacity response. Compare the repeated failures listed in this issue and use the linked build artifacts to understand the cluster-creation path. Done means cluster_creation no longer fails for this capacity condition.

Written by the indexing model from the issue text.