The use of distributed systems is increasing day by day. This makes communication between systems important more than ever. In this article, we examine event-based communication between these systems. And we present a basic event-driven architecture (EDA) for basic use cases.

In this article, we will cover the basics of a Lambda function and its functionality in our every day digital lives. AWS Lambda, as we already know, is a compute service that allows you to run code without managing servers. AWS Lambda runs the code when it is needed, and it is automatically scaled. The code you execute on AWS Lambda is called Lambda function, and it can be considered, for better understanding, as a formula in a spreadsheet.

Imagine a complex distributed system with lots of API calls, messaging transactions, and database operations. Having a complex system brings its own complex problems on observing the overall performance of resources used by the system. Resource usage monitoring is a challenge in serverless applications. Unexpected time-consuming resources may affect your application’s performance, and time has never been so important on a single function call as ever.

In this article, we’ll guide you through how to develop and deploy a small serverless Ruby application using the Serverless Framework and AWS Lambda. We’ll show you how to create the resources, deploy the code, and troubleshoot scenarios. Most importantly, we’ll highlight the importance of observability by having you integrate your finished app into Epsagon to achieve full monitoring. Sample code for this article is available here

AWS Lambda is a serverless compute service that allows you to run code without having to manage servers. Lambda provides autoscaling and bills only on compute time, so you aren’t paying for unused resources. Some common use cases are file processing, stream processing, and acting as a backend for web and mobile applications. AWS Lambda functions can be invoked with external HTTP requests as well as by events triggered by over 200 different AWS services.

Our motto is “Observability for all!”. This has multiple meanings. We provide observability products for all the phases of the software development life cycle from development to post production. And we believe that observability is a basic need so we provide our products and services forever for free up to a pretty generous level of usage.