basalt-26.3.2-rc-20260908: pkg/sql/sqlstats/insights/integration/integration_test: TestTransactionInsightsFailOnCommit failed

pkg/sql/sqlstats/insights/integration/integration_test.TestTransactionInsightsFailOnCommit [failed](https://mesolite.cluster.engflow.com/invocations/default/5d15a619-5664-4606-90d0-90e2519cd159?testReportRun=3&testReportShard=1&testReportAttempt=1#targets-Ly9wa2cvc3FsL3NxbHN0YXRzL2luc2lnaHRzL2ludGVncmF0aW9uOmludGVncmF0aW9uX3Rlc3Q=) on basalt-26.3.2-rc-20260908 @ [807558e5e81666af257c811e925e4cae570abc28](https://github.com/cockroachdb/cockroach/commits/807558e5e81666af257c811e925e4cae570abc28):

```
=== RUN TestTransactionInsightsFailOnCommit
test_log_scope.go:172: test logs captured to: outputs.zip/logTestTransactionInsightsFailOnCommit2236444248
test_log_scope.go:82: use -show-logs to present logs inline
test_server_shim.go:168: automatically injected a shared process virtual cluster under test; see comment at top of test_server_shim.go for details.
insights_test.go:718: -- test log scope end --
test logs left over in: outputs.zip/logTestTransactionInsightsFailOnCommit2236444248
--- FAIL: TestTransactionInsightsFailOnCommit (85.56s)
=== RUN TestTransactionInsightsFailOnCommit/enable_recording_SERIALIZATION_CONFLICT_events=true
insights_test.go:626:
Error Trace: pkg/sql/sqlstats/insights/integration/insights_test.go:626
pkg/testutils/subtest.go:23
Error: An error is expected but got nil.
Test: TestTransactionInsightsFailOnCommit/enable_recording_SERIALIZATION_CONFLICT_events=true
--- FAIL: TestTransactionInsightsFailOnCommit/enable_recording_SERIALIZATION_CONFLICT_events=true (7.99s)
```

Parameters:
- attempt=1
- race=true
- run=3
- shard=1
Help

See also: [How To Investigate a Go Test Failure \(internal\)](https://cockroachlabs.atlassian.net/l/c/HgfXfJgM)

Same failure on other branches

- #174696 basalt-26.3: pkg/sql/sqlstats/insights/integration/integration_test: TestTransactionInsightsFailOnCommit failed [C-test-failure O-robot T-observability branch-basalt-26.3 release-blocker]
- #174652 pkg/sql/sqlstats/insights/integration/integration_test: TestTransactionInsightsFailOnCommit failed [C-test-failure O-robot T-observability branch-master]

/cc @cockroachlabs/obs-prs

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

Start with pkg/sql/sqlstats/insights/integration/insights_test.go, especially TestTransactionInsightsFailOnCommit and the assertion at line 626. Run the failing integration test with the reported SERIALIZATION_CONFLICT and recording parameters, then inspect the linked test logs to determine why the expected commit error is nil. Done means the test reliably observes the expected failure on the affected branches.

Written by the indexing model from the issue text.