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docs: explain the new database statistics in log lines

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Quentin Gliech
2026-06-22 14:43:05 +02:00
parent d84fd87517
commit e913ddbc9e
1 changed files with 16 additions and 2 deletions
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docs/reference/request-log.md
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@@ -18,7 +18,7 @@ made it.
## Example
```
2026-06-17T10:49:22.419912Z INFO http.server.response POST-71 - "POST /login HTTP/2.0" 303 See Other "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.5 Safari/605.1.15" [polls: 12, cpu: 5.5ms, elapsed: 57.9ms] requester=user:01H8VZ…(alice) client.address=2a01:e0a:f5c:5b02:85c9:3849:4811:4383 trace.id=c8c8fc32288a76693e028ee97a6030a0
2026-06-17T10:49:22.419912Z INFO http.server.response POST-71 - "POST /login HTTP/2.0" 303 See Other "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.5 Safari/605.1.15" [polls: 12, cpu: 4.7ms, db: 10.9ms, elapsed: 46.9ms, queries: 4, fetched: 2] requester=user:01H8VZ…(alice) client.address=2a01:e0a:f5c:5b02:85c9:3849:4811:4383 trace.id=c8c8fc32288a76693e028ee97a6030a0
```
Broken down:
@@ -32,7 +32,21 @@ Broken down:
| Request line | `"POST /login HTTP/2.0"` | The HTTP method, path and protocol version. The path does **not** include the query string. |
| Status | `303 See Other` | The response status code and its reason phrase. |
| User agent | `"Mozilla/5.0 …"` | The `User-Agent` header, or `"-"` if absent. |
| Stats | `[polls: 12, cpu: 5.5ms, elapsed: 57.9ms]` | How many times the request task was polled, the CPU time it used, and the wall-clock time elapsed handling it. |
| Stats | `[polls: 12, …]` | Log context statistics, see below. |
## Log context statistics
Each request log line includes statistics about the request task in brackets,
such as the number of polls, CPU time used, and wall-clock time elapsed.
| Field | Example | Meaning |
| --- | --- | --- |
| `polls` | `12` | The number of times the request task was polled. |
| `cpu` | `0.5ms` | The CPU time used by the request task, in milliseconds. |
| `db` | `0.3ms` | The time spent querying the database, in milliseconds. |
| `elapsed` | `1.2ms` | The wall-clock time elapsed handling the request, in milliseconds. |
| `queries` | `3` | The number of database queries executed. |
| `fetched` | `2` | The number of rows fetched from the database. |
## Fields