traefik accesslog Duration字段说明
有访问日志如下：
{
"ClientAddr": "10.6.36.11:29084",
"ClientHost": "10.6.36.11",
"ClientPort": "29084",
"ClientUsername": "-",
"DownstreamContentSize": 19,
"DownstreamStatus": 404,
"Duration": 195982,
"OriginContentSize": 19,
"OriginDuration": 14847,
"OriginStatus": 404,
"Overhead": 181135,
"RequestAddr": "api.by.com",
"RequestContentSize": 0,
"RequestCount": 74869,
"RequestHost": "api.by.com",
"RequestMethod": "GET",
"RequestPath": "/",
"RequestPort": "-",
"RequestProtocol": "HTTP/1.1",
"RequestScheme": "http",
"RetryAttempts": 0,
"StartLocal": "2021-09-10T16:34:24.142707156+08:00",
"StartUTC": "2021-09-10T08:34:24.142707156Z",
"downstream_Content-Type": "text/plain; charset=utf-8",
"downstream_X-Content-Type-Options": "nosniff",
"entryPointName": "web",
"level": "info",
"msg": "",
"origin_Content-Type": "text/plain; charset=utf-8",
"origin_X-Content-Type-Options": "nosniff",
"request_Accept": "*/*",
"request_My_name": "haifeng",
"request_User-Agent": "curl/7.29.0",
"request_X-Forwarded-Host": "api.by.com",
"request_X-Forwarded-Port": "80",
"request_X-Forwarded-Proto": "http",
"request_X-Forwarded-Server": "k8s-node-56-161.by.com",
"request_X-Real-Ip": "10.6.36.11",
"time": "2021-09-10T16:34:24+08:00"
}
观察"Duration": 195982和"OriginDuration": 14847，这两个值的单位是什么呢？
在官方文档中没有查到，源码中搜索了下，解释如下。
各字段说明
| Field | Description |
|-------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `StartUTC` | The time at which request processing started. |
| `StartLocal` | The local time at which request processing started. |
| `Duration` | The total time taken (in nanoseconds) by processing the response, including the origin server's time but not the log writing time. |
| `RouterName` | The name of the Traefik router. |
| `ServiceName` | The name of the Traefik backend. |
| `ServiceURL` | The URL of the Traefik backend. |
| `ServiceAddr` | The IP:port of the Traefik backend (extracted from `ServiceURL`) |
| `ClientAddr` | The remote address in its original form (usually IP:port). |
| `ClientHost` | The remote IP address from which the client request was received. |
| `ClientPort` | The remote TCP port from which the client request was received. |
| `ClientUsername` | The username provided in the URL, if present. |
| `RequestAddr` | The HTTP Host header (usually IP:port). This is treated as not a header by the Go API. |
| `RequestHost` | The HTTP Host server name (not including port). |
| `RequestPort` | The TCP port from the HTTP Host. |
| `RequestMethod` | The HTTP method. |
| `RequestPath` | The HTTP request URI, not including the scheme, host or port. |
| `RequestProtocol` | The version of HTTP requested. |
| `RequestScheme` | The HTTP scheme requested `http` or `https`. |
| `RequestLine` | `RequestMethod` + `RequestPath` + `RequestProtocol` |
| `RequestContentSize` | The number of bytes in the request entity (a.k.a. body) sent by the client. |
| `OriginDuration` | The time taken (in nanoseconds) by the origin server ('upstream') to return its response. |
| `OriginContentSize` | The content length specified by the origin server, or 0 if unspecified. |
| `OriginStatus` | The HTTP status code returned by the origin server. If the request was handled by this Traefik instance (e.g. with a redirect), then this value will be absent. |
| `OriginStatusLine` | `OriginStatus` + Status code explanation |
| `DownstreamStatus` | The HTTP status code returned to the client. |
| `DownstreamStatusLine` | `DownstreamStatus` + Status code explanation |
| `DownstreamContentSize` | The number of bytes in the response entity returned to the client. This is in addition to the "Content-Length" header, which may be present in the origin response. |
| `RequestCount` | The number of requests received since the Traefik instance started. |
| `GzipRatio` | The response body compression ratio achieved. |
| `Overhead` | The processing time overhead (in nanoseconds) caused by Traefik. |
| `RetryAttempts` | The amount of attempts the request was retried. |
| `TLSVersion` | The TLS version used by the connection (e.g. `1.2`) (if connection is TLS). |
| `TLSCipher` | The TLS cipher used by the connection (e.g. `TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA`) (if connection is TLS) |
可以看到Duration和OriginDuration的单位是nanoseconds。如果想让其在日志系统中显示得友好一些，可以在收集日志时将其转换为秒。
参考
- https://github.com/traefik/traefik/blob/master/docs/content/observability/access-logs.md
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