Send traces and logs from AWS Lambda Node.js functions to SigNoz

OpenTelemetry has autoinstrumentation support for Node.js lambda functions. With autoinstrumentation you will be able to send traces and logs easily.

In this example we will create a simple Node.js lambda function and deploy it.

1. Create a new Node.js application using yarn init -y
2. Add the following packages

yarn add @opentelemetry/api

2. Add the following code to index.js

const { trace } = require("@opentelemetry/api");
const logsAPI = require('@opentelemetry/api-logs');

const provider = logsAPI.logs.getLoggerProvider()
const logger = provider.getLogger('default', '1.0.0');
const { flush } = require("./instrumentation")

const tracer = trace.getTracer("test", "0.1");

exports.handler = async (event) => {
  const parentSpan = tracer.startSpan('main');
  tracer.startActiveSpan('testSpan', (parentSpan) => {
    logger.emit({
      severityText: 'info',
      body: 'this is a log body example',
      attributes: { 'log.type': 'custom' },
    });
    parentSpan.end();
  });

  const response = {
    statusCode: 200,
    body: JSON.stringify('Hello from Lambda!'),
  };

  provider.forceFlush();
  return response;
};

Here we are creating a span, emitting a log line and then flushing the loggerProvider. Please note that it is important to flush the loggerProvider to not miss any log lines.

Here is the link to the github repository.

3. Zip the folder using zip -r deploy.zip ./
4. Upload the zip to aws lambda by going to Code and selecting Upload from .zip file.
5. Add the following environment variables by going to Configuration and selecting Environment Variables

AWS_LAMBDA_EXEC_WRAPPER=/opt/otel-handler
OTEL_EXPORTER_OTLP_ENDPOINT=<SIGNOZ_ENDPOINT>
OTEL_EXPORTER_OTLP_HEADERS=signoz-ingestion-key=<INGESTION_KEY>
OTEL_RESOURCE_ATTRIBUTES=service.name=<SERVICE_NAME>

• The value of SIGNOZ_ENDPOINT will be https://ingest.{region}.signoz.cloud:443 where depending on the choice of your region for SigNoz cloud, the otlp endpoint will vary according to this table.

• The value of INGESTION_KEY is your ingestion key.
• The value of SERVICE_NAME will be the name of the lambda function.

6. In the Layers section add a new layer, i.e the otel lambda layer

arn:aws:lambda:<region>:184161586896:layer:opentelemetry-nodejs-0_9_0:4

• replace <region> with the region where your function is running. You can find the latest version here

7. Now you can test the function and you will be able to see the corresponding logs and traces in SigNoz