AWS Lambda structured event monitoring

Test the integration

Send and verify events with AWS Lambda structured event monitoring

Use AWS Lambda structured event monitoring where your app knows the final result. Collect only the fields you need, then verify a test event before building charts.

1
Choose the outcome
Serverless function reliability
2
Define the contract
function_name, invocation_type, and cold_start
3
Log the final result
Initialize reusable clients outside the handler and emit only one final outcome per invocation.
4
Check the stored event
Exercise a known fixture, then inspect lambda_invocation_completed for one correctly typed terminal row.

Before you start

A TELEMETRY_API_KEY configured as an encrypted Lambda environment variable
The telemetry-sh client initialized outside the handler when the runtime is reused
An explicit decision about ingestion failure and function completion

Delivery setup

Install and initialize server-side

Import telemetry-sh in server-only code and initialize it once with process.env.TELEMETRY_API_KEY. Keep ingestion credentials out of browser bundles, client-visible environment variables, source control, logs, and exception messages.

aws-lambda-install

npm installation

bash

npm install telemetry-sh

1Create one reusable server-side client. Set its timeout and retry limit.
2Log an event when the operation succeeds, fails, retries, or times out.
3Send test events with known results and inspect the stored rows before enabling an alert.

Snippet

Start with one structured event

Add this shape where the workflow completes, fails, or retries. Then build the dashboard from real fields.

aws-lambda

AWS Lambda structured event monitoring event

javascript

let coldStart = true;

export const handler = async (event, context) => {
  const startedAt = performance.now();
  const result = await processBatch(event);

  await telemetry.log("lambda_invocation_completed", {
    function_name: context.functionName,
    aws_request_id: context.awsRequestId,
    status: "success",
    duration_ms: Math.round(performance.now() - startedAt),
    item_count: result.itemCount,
    cold_start: coldStart,
  });

  coldStart = false;
  return result;
};

Event schema

function_name, invocation_type, and cold_start

status, duration_ms, attempt, and error_type

aws_request_id, release, and safe workflow identifiers

Check your setup

Checkpoint 1

Initialize reusable clients outside the handler and emit only one final outcome per invocation.

Checkpoint 2

Await ingestion before returning unless a tested delivery mechanism handles flushing.

Checkpoint 3

Do not log the raw Lambda event because it may contain credentials or customer payloads.

Verification

Prove the event arrived

Run this after exercising known success and failure cases. Replace the fallback table name if your final event contract differs from the snippet.

aws-lambda-verification

AWS Lambda structured event monitoring verification query

sql

SELECT *
FROM lambda_invocation_completed
ORDER BY timestamp_utc DESC
LIMIT 20;

Confirm one terminal row per logical outcome, with the expected status, identifiers, units, and UTC time.

Inspect the inferred schema and verify that retries do not change field types or generate a new logical event ID.

Search the stored fields for credentials, raw payloads, prompts, private content, and unbounded error messages.

Exercise a provider timeout, ingestion rejection, and process shutdown before treating the dashboard as complete.

Implementation references

Review the event contract, data-safety guidance, and upstream primary documentation before enabling a new production path.

Background job monitoring Missing heartbeat SQL AWS Lambda Node.js logging

Where to log

Keep the outcome event small and recoverable

This pattern provides

Record the outcome as an event you can query with SQL.
Stable fields for dashboards, alerts, and cross-event correlation.
Test events for checking success, failure, retries, and timeouts.

This pattern does not provide

An OTLP exporter, automatic collection pipeline, or replacement for detailed traces and diagnostic logs.
Exactly-once delivery merely because the payload contains an event ID.
Permission to collect raw provider payloads, user content, credentials, or regulated data.

Delivery and idempotency Batching and shutdown Troubleshoot ingestion

Example event schemas

Check what each event records, when to send it, and which field types it needs. Review the example payload and privacy checklist before using it in production.

Async reliability11 fields