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feat: remove chat chain mode (#26980)

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Removes OpenAI Responses "chain mode" from chatd. Closes CODAGT-445.

- Deletes `chatopenai/responses.go` (chain detection, activation, prompt filtering, response ID extraction) and its tests.
- Deletes the `ChainBroken` classification in `chaterror` and the chatloop retry bookkeeping that disabled chain mode mid-generation.
- Drops the `chain_broken` label from the `coderd_chatd_stream_retries_total` metric.
- Stops reading and writing `chat_messages.provider_response_id`
- Deletes the dead `ClearChatMessageProviderResponseIDsByChatID` query. Dropping the column is a follow-up migration.
- Deletes three chatloop hooks no caller sets (`ReloadMessages`, `DisableChainMode`, `PrepareMessages`), the dead `const AgentChatContextSentinelPath`, and stale chain-mode comments.

🤖 Generated by Coder Agents on behalf of @johnstcn.
This commit is contained in:
Cian Johnston
2026-07-06 11:57:12 +01:00
committed by GitHub
parent c0e2811e01
commit b21e0717d5
37 changed files with 308 additions and 2791 deletions
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docs/admin/integrations/prometheus.md
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@@ -229,7 +229,7 @@ deployment. They will always be available from the agent.
| `coderd_chatd_prompt_size_bytes` | histogram | Estimated byte size of the prompt per LLM request. | `model` `provider` |
| `coderd_chatd_steps_total` | counter | Total agentic loop steps across all chats. | `model` `provider` |
| `coderd_chatd_stream_buffer_dropped_total` | counter | Number of chat stream buffer events dropped due to the per-chat buffer cap. | |
| `coderd_chatd_stream_retries_total` | counter | Total LLM stream retries. | `chain_broken` `kind` `model` `provider` |
| `coderd_chatd_stream_retries_total` | counter | Total LLM stream retries. | `kind` `model` `provider` |
| `coderd_chatd_tool_errors_total` | counter | Total tool calls that returned an error result. | `model` `provider` `tool_name` |
| `coderd_chatd_tool_result_size_bytes` | histogram | Size in bytes of each tool execution result. | `model` `provider` `tool_name` |
| `coderd_chatd_tool_result_truncated_total` | counter | Total tool results truncated to fit the model context window. | `model` `provider` `tool_name` |