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@opentelemetry/instrumentation-winston

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@opentelemetry/instrumentation-winston

OpenTelemetry instrumentation for `winston` logger

  • 0.43.0
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  • npm
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What is @opentelemetry/instrumentation-winston?

@opentelemetry/instrumentation-winston is an npm package that provides automatic instrumentation for the Winston logging library, enabling the collection of telemetry data such as traces and metrics. This helps in monitoring and debugging applications by providing insights into the logging behavior.

What are @opentelemetry/instrumentation-winston's main functionalities?

Automatic Trace Context Injection

This feature automatically injects trace context into Winston log messages, allowing you to correlate logs with traces. The code sample demonstrates how to enable the instrumentation and create a Winston logger that includes trace context in its log messages.

const { WinstonInstrumentation } = require('@opentelemetry/instrumentation-winston');
const winston = require('winston');

const instrumentation = new WinstonInstrumentation();
instrumentation.enable();

const logger = winston.createLogger({
  transports: [
    new winston.transports.Console()
  ]
});

logger.info('This is an info message');

Custom Log Format with Trace Context

This feature allows you to customize the log format to include trace context information. The code sample shows how to create a custom log format that includes a timestamp and other metadata, which can be useful for detailed log analysis.

const { WinstonInstrumentation } = require('@opentelemetry/instrumentation-winston');
const winston = require('winston');

const instrumentation = new WinstonInstrumentation();
instrumentation.enable();

const logger = winston.createLogger({
  format: winston.format.combine(
    winston.format.timestamp(),
    winston.format.printf(({ level, message, timestamp, ...meta }) => {
      return `${timestamp} [${level}]: ${message} ${JSON.stringify(meta)}`;
    })
  ),
  transports: [
    new winston.transports.Console()
  ]
});

logger.info('This is an info message');

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Package last updated on 05 Dec 2024

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