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feat: add Prometheus metrics for chatd subsystem (#24371)

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Adds 7 Prometheus metrics to the chatd subsystem and introduces typed
`ActivityBumpReason` for deadline bump attribution.

| Metric | Type | Labels |
|--------|------|--------|
| `coderd_chatd_chats` | Gauge | `state` (streaming, waiting) |
| `coderd_chatd_message_count` | Histogram | `provider` |
| `coderd_chatd_prompt_size_bytes` | Histogram | `provider` |
| `coderd_chatd_tool_result_size_bytes` | Histogram | `provider`,
`tool_name` |
| `coderd_chatd_ttft_seconds` | Histogram | `provider` |
| `coderd_chatd_compaction_total` | Counter | `provider`, `result` |
| `coderd_chatd_steps_total` | Counter | `provider` |

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This commit is contained in:
Cian Johnston
2026-04-15 19:53:10 +01:00
committed by GitHub
parent 2b68a1f4bd
commit d7439a9de0
13 changed files with 644 additions and 13 deletions
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docs/admin/integrations/prometheus.md
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@@ -198,6 +198,13 @@ deployment. They will always be available from the agent.
| `coderd_authz_authorize_duration_seconds` | histogram | Duration of the 'Authorize' call in seconds. Only counts calls that succeed. | `allowed` |
| `coderd_authz_prepare_authorize_duration_seconds` | histogram | Duration of the 'PrepareAuthorize' call in seconds. | |
| `coderd_build_info` | gauge | Describes the current build/version of the Coder server. Value is always 1. | `revision` `version` |
| `coderd_chatd_chats` | gauge | Number of chats being processed, by state. | `state` |
| `coderd_chatd_compaction_total` | counter | Total compaction outcomes (only recorded when compaction was triggered or failed). | `provider` `result` |
| `coderd_chatd_message_count` | histogram | Number of messages in the prompt per LLM request. | `provider` |
| `coderd_chatd_prompt_size_bytes` | histogram | Estimated byte size of the prompt per LLM request. | `provider` |
| `coderd_chatd_steps_total` | counter | Total agentic loop steps across all chats. | `provider` |
| `coderd_chatd_tool_result_size_bytes` | histogram | Size in bytes of each tool execution result. | `provider` `tool_name` |
| `coderd_chatd_ttft_seconds` | histogram | Time-to-first-token: wall time from LLM request to first streamed chunk. | `provider` |
| `coderd_db_query_counts_total` | counter | Total number of queries labelled by HTTP route, method, and query name. | `method` `query` `route` |
| `coderd_db_query_latencies_seconds` | histogram | Latency distribution of queries in seconds. | `query` |
| `coderd_db_tx_duration_seconds` | histogram | Duration of transactions in seconds. | `success` `tx_id` |