roachtest: monitor_failure failed

roachtest.monitor_failure [failed](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_RoachtestNightlyGceBazel/21366977?buildTab=log) with [artifacts](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_RoachtestNightlyGceBazel/21366977?buildTab=artifacts#/ledger/nodes=6/multi-az) on release-26.1.5-rc @ [2162fab1ea78bc39eb153518fe2ee291f439e12d](https://github.com/cockroachdb/cockroach/commits/2162fab1ea78bc39eb153518fe2ee291f439e12d):

Failed with:

```
test ledger/nodes=6/multi-az failed: (cluster.go:2512).Run: context canceled
(monitor.go:267).Wait: monitor failure: monitor user task failed: t.Fatal() was called
EOF [owner=test-eng]
test artifacts and logs in: /artifacts/ledger/nodes=6/multi-az/run_1
```
Cluster Node to Ip Mapping:
| Node | Public IP | Private IP |
| --- | --- | --- |
| teamcity-21366977-1780294013-149-n7cpu16-geo-0001 | 35.225.15.226 | 10.128.0.79 |
| teamcity-21366977-1780294013-149-n7cpu16-geo-0002 | 35.253.2.176 | 10.128.0.74 |
| teamcity-21366977-1780294013-149-n7cpu16-geo-0003 | 136.115.132.95 | 10.128.0.77 |
| teamcity-21366977-1780294013-149-n7cpu16-geo-0004 | 136.119.168.63 | 10.128.0.78 |
| teamcity-21366977-1780294013-149-n7cpu16-geo-0005 | 136.113.91.45 | 10.128.0.73 |
| teamcity-21366977-1780294013-149-n7cpu16-geo-0006 | 34.133.205.103 | 10.128.0.68 |
| teamcity-21366977-1780294013-149-n7cpu16-geo-0007 | 34.63.156.149 | 10.128.0.36 |

Parameters:
- arch=amd64
- cloud=gce
- coverageBuild=false
- cpu=16
- diskCount=0
- encrypted=false
- fs=ext4
- localSSD=true
- 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)

See: [Grafana](https://go.crdb.dev/roachtest-grafana/teamcity-21366977/ledger-nodes-6-multi-az/1780315669888/1780315859360)

Same failure on other branches

- #169795 roachtest: monitor_failure failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-24.3.32-rc]
- #164923 roachtest: monitor_failure failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-25.2.15-rc]
- #158748 roachtest: monitor_failure failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-25.2.10-rc]
- #154428 roachtest: monitor_failure failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-25.4]
- #153156 roachtest: monitor_failure failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-25.3.2-rc]
- #153148 roachtest: monitor_failure failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-24.1.24-rc]
- #153136 roachtest: monitor_failure failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-25.2.6-rc]
- #151922 roachtest: monitor_failure failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-25.3.1-rc]
- #151630 roachtest: monitor_failure failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-24.1.23-rc]

/cc @cockroachdb/test-eng

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

Jira issue: CRDB-64430