#Loki Logging Plugin

#Setup

The Loki Log plugin enables pushing logs to your Loki server.

To add the Loki logging plugin to your Zuplo project, add the following code to your zuplo.runtime.ts file. Replace my-username with your Grafana username and my-password with your Grafana password. Set the url option to the value of your Loki host.

Optionally, you can set the job value to set the name of your log stream job. This defaults to zuplo if not set.

Setting the version option to 2 changes the log stream to not include the requestId value in the stream, but rather include it as a log value.

import {
  RuntimeExtensions,
  LokiLoggingPlugin,
  environment,
} from "@zuplo/runtime";

export function runtimeInit(runtime: RuntimeExtensions) {
  runtime.addPlugin(
    new LokiLoggingPlugin({
      url: "https://logs-prod-us-central1.grafana.net/loki/api/v1/push",
      username: "my-username",
      job: "my-api",
      password: environment.LOKI_PASSWORD,
      version: 2,
    }),
  );
}

#Standard Fields

Every log entry will have a timestamp and a jsonPayload object. The value of the jsonPayload contains the text or objects passed into the log.

Steam fields are:

• job - The name of the log stream job. Defaults to zuplo.
• level - The level of the log, i.e. ERROR, INFO, etc.
• environmentType - Where the Zuplo API is running. Values are edge, working-copy, or local
• environmentStage - If the environment is working-copy, preview, or production

Log trace fields are:

• requestId - The UUID of the request (the value of the zp-rid header)
• atomicCounter - An atomic number that is used to order logs that have the same timestamp
• rayId - The Cloudflare RayID of the request

Note, log trace fields are only included if the version option is set to 2 or later.

#Log Format

The shape of the logs sent from Zuplo will be in the following format. If using version 2, tracing info (requestId, etc.) will be included in the log values.

{
  "streams": [
    {
      "stream": {
        "job": "zuplo",
        "level": "debug",
        "environmentType": "local",
        "environmentStage": "local"
      },
      "values": [
        [
          "1712254635666000000",
          "Request received '/hello-world'",
          {
            "requestId": "9b9cd3fd-b0fa-455f-b894-4a5c2c9d131b",
            "rayId": "1235567",
            "atomicCounter": 123435346
          }
        ],
        [
          "1712254635666000000",
          "{\"method\":\"GET\",\"url\":\"/hello-world\",\"hostname\":\"localhost\",\"route\":\"/hello-world\"}",
          {
            "requestId": "9b9cd3fd-b0fa-455f-b894-4a5c2c9d131b",
            "rayId": "1235567",
            "atomicCounter": 123435347
          }
        ]
      ]
    }
  ]
}