Fix error message

[dandavison]

What changed?

Clarify an error message.

Why?

The error message wasn't written clearly.

How did you test it?

• built
• run locally and tested manually
• covered by existing tests

I have seen the new message in local testing:

{
  "level": "warn",
  "ts": "2026-01-19T14:23:09.763-0500",
  "msg": "Workflow task attempt 20 exceeds critical threshold (10)",
  "shard-id": 1,
  "address": "127.0.0.1:7234",
  "wf-namespace": "default",
  "wf-id": "test-stats-minimal:019bd761-bf89-7a12-b00b-b5f6386e7458-config-driven-minimalstatstest-1",
  "wf-run-id": "55242767-89b6-4e33-97ab-93eff948149f",
  "attempt": 20,
  "logging-call-at": "/Users/dan/src/temporal-all/repos/temporal/service/history/workflow/workflow_task_state_machine.go:1345"
}

Potential risks

Could panic in WFT processing if the code has a bug.

---

Note

Improves the warn log emitted when workflow task attempts reach the critical threshold.

• In workflow_task_state_machine.go, updates emitWorkflowTaskAttemptStats to compute threshold once and log a formatted message: Workflow task attempt <attempt> exceeds critical threshold (<threshold>)
• Adds fmt import to support the new formatted log message

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Cursor Bugbot has reviewed your changes and found 1 potential issue.