A comprehensive guide to serverless monitoring and debugging

In recent years, serverless computing has become popular among developers and organizations due to its scalability, cost-efficiency, and ease of deployment. However, managing and monitoring serverless applications can be challenging.

  • Serverless computing
    • Advantages of serverless computing
    • Disadvantages of serverless computing
    • Challenges in monitoring and debugging serverless applications
    • Differences between serverless and traditional computing
  • Serverless monitoring
    • Serverless monitoring techniques
    • Best practices for serverless monitoring
  • Serverless debugging
    • Common errors in serverless applications
    • Serverless debugging techniques
    • Best practices for serverless debugging
    • Additional tips for debugging your serverless applications
  • Tools for serverless monitoring and debugging

Serverless computing

Contrary to what the term “serverless” may suggest, serverless computing does not mean no servers are involved. Instead, it refers to a cloud computing model where the cloud provider takes care of all the infrastructure management, so developers can focus on building and running their applications. In a serverless architecture, the cloud provider dynamically manages the server resources, automatically scaling them based on demand.

Serverless computing frees developers to focus on their core competencies, such as writing code, without the need to manage servers, virtual machines, or containers. As a result, it enables fast development and deployment, as developers can concentrate solely on the application logic, leaving infrastructure concerns to the cloud provider. In addition, serverless architectures are event-driven and typically execute code in stateless compute containers triggered by various events such as HTTP requests, database updates, or file uploads.

Advantages of serverless computing

Serverless computing has its advantages, which include the following:

Architecture can be easily changed and expanded

Serverless computing can help scale applications quickly and provides organizations with the flexibility to design and build scalable and modular architectures. Developers can break down applications into smaller, independent functions or microservices, which can be developed, deployed, and scaled independently. Serverless platforms often support event-driven architectures, which enable seamless integration with other services and systems. This flexibility empowers businesses to adapt and scale their applications as needed, accommodating changing requirements and future growth.

Faster Time-to-Market

In today’s digital world, speed is of the essence. To stay competitive, businesses need to continuously release new and innovative products and services. Serverless computing enables faster time-to-market by streamlining the development and deployment processes. With the simplified development model offered by serverless platforms, developers can rapidly prototype, test, and iterate their applications. The ability to focus on business logic and delegate infrastructure management tasks to the platform provider enables organizations to deliver innovative solutions to customers in record time.

Utilization of resources

Traditionally, many servers run idle or are underutilized, resulting in wasted resources and increased costs. Serverless computing optimizes resource utilization by allocating resources on demand. The resource allocation minimizes waste and ensures optimal utilization, which leads to improved system performance.

Enhanced fault tolerance and availability

By design, serverless applications are distributed across multiple availability zones, and it manages failover and replication. It ensures that even if one component or function fails, the system as a whole remains operational, minimizing downtime and maintaining service availability. Serverless architecture also removes the single point of failure that can arise from managing dedicated servers, which makes it reliable.

Cost savings

One of the most important advantages of serverless computing is cost efficiency. Businesses no longer need to invest in provisioning and maintaining dedicated servers. Instead, they only pay for the actual usage of resources. It does away with the need for upfront capital investment and reduces operational costs, making it an attractive option for startups and enterprises.


Serverless computing can be just as secure as cloud-based infrastructure. It is because the cloud provider handles all security measures, such as data encryption.

Disadvantages of serverless computing

Serverless computing is like any other technology. It has drawbacks. Some of the disadvantages of serverless computing that developers and organizations should be aware of include:

Vendor lock-in

Changing providers can be difficult once you start using serverless computing. Because cloud service providers (CSPs) offer serverless platforms, this lock-in makes migrating applications to another provider challenging. Organizations need to carefully consider the long-term implications of relying on a specific CSP.

Debugging and testing challenges

One of the disadvantages is that debugging and troubleshooting problems can be a challenge. Debugging code in a distributed environment can be problematic, especially when multiple functions and event sources are involved. Additionally, testing serverless functions locally can be equally difficult due to the reliance on cloud provider-specific APIs and services. It can increase the time for development and complicate the debugging process.

Dependency on third-party services

Serverless computing relies on integration with various third party services, such as databases, storage, queues, and authentication providers. While this integration simplifies development, it introduces a dependency on external services. If any of these services experience downtime or performance issues, it can directly impact the functioning of serverless applications.

Challenges in monitoring and debugging serverless applications

Both monitoring and debugging are important to ensure serverless applications operate smoothly. Let’s explore some of the challenges faced with these tasks.

Cold start latency

Serverless platforms rely on automatic scaling and resource provisioning to handle incoming requests. When a function is inactive for a certain period or experiences a sudden surge in traffic, it may incur a cold start latency. Cold starts happen when a platform needs to initialize the function execution environment, resulting in increased response time and a degraded user experience.

Lack of visibility

In a traditional application, developers have various tools that help them monitor and debug the code. However, in a serverless application, the cloud provider controls access to these tools, so developers need help getting the information they need to troubleshoot problems.

Handling asynchronous operations

Serverless apps rely mostly on asynchronous operations and event-driven architectures. Monitoring these asynchronous workflows can be difficult and complex, especially when multiple functions are involved.

Limited debugging capabilities

Serverless platforms can make it hard to debug code. You can’t use real-time debugging or interactive breakpoints, making it difficult to find and fix problems when they happen.

Distributed nature

Serverless applications are made up of different parts spread across other servers, making it challenging to see how the whole application is working and what is happening at any given time.

Differences between serverless and traditional computing

Serverless computing is a good choice for developers who want to focus on building their applications and avoid being concerned with server management tasks. Traditional computing is a good choice for developers who need more control over the underlying infrastructure. One of the differences between serverless and traditional computing models lies in infrastructure management. In traditional computing, developers manage servers to run their applications. It involves tasks such as configuring hardware, setting up operating systems, and managing network infrastructure. At the same time, serverless computing abstracts away the underlying infrastructure entirely. Developers can focus on writing code and defining functions while the cloud provider manages the servers and resources needed to run the applications.

Scalability is another area where serverless computing models excel. In traditional computing models, scaling applications to handle different workloads requires careful planning and resource allocation. Serverless computing, on the other hand, offers automatic and seamless scalability. With serverless architectures, applications can scale actively based on demand. Cloud providers handle the scaling process transparently, allocating resources as needed and automatically adjusting capacity to match workload functions.

The cost of serverless computing is different from traditional computing. Traditional computing involves fixed costs, as organizations need to invest in hardware, infrastructure, and maintenance. In serverless computing, prices are directly tied to usage, and you only pay for the actual execution time of your functions or applications.

Serverless computing models are function-oriented, while traditional computing models are more application-centric. In traditional computing, developers build and deploy entire applications consisting of multiple components and services. In serverless architectures, developers break down applications into smaller, independent functions. Each function performs a specific task or handles a particular event.

The ecosystem and availability of third-party integrations can differ between serverless and traditional computing models. Traditional has a more mature ecosystem with many tools, frameworks, and libraries for developers to leverage. Serverless computing may have a more limited ecosystem. However, major cloud providers are expanding their serverless offerings and integrating popular frameworks and services.

Here is a table that summarizes the key differences between serverless computing and traditional computing:

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Serverless monitoring

Serverless monitoring involves collecting and analyzing data about serverless applications to identify and fix performance, security, and availability issues. Its data can be collected from different sources, including logs, metrics, and traces. Serverless applications are typically deployed on cloud platforms, such as AWS Lambda, Google Cloud Functions, and Azure Functions. These platforms provide several built-in monitoring capabilities. Monitoring serverless applications is necessary for ensuring security and compliance requirements are met. By monitoring access logs, authentication mechanisms, and data transfers, organizations can identify potential security vulnerabilities and enforce compliance standards. It can provide valuable insights into the performance of serverless applications. This information can be used to make better decisions about managing serverless applications. It can also help in identifying and addressing problems before they impact users. Finally, it automatically offers the ability to scale resources based on demand. With serverless monitoring, organizations can gain visibility into resource usage and associated costs.

Serverless monitoring techniques


Logging is one of the techniques used for monitoring serverless applications. Cloud providers offer logging services that capture runtime information. It involves collecting and analyzing log files from serverless applications. Organizations can use this data by analyzing logs to gain insights into application behavior, performance, and other issues.


It involves collecting and analyzing traces from serverless applications. It complements logging by providing end-to-end visibility into distributed applications, allowing organizations to track requests as they flow through different components.

Metrics and dashboards

Monitoring metrics like CPU utilization, memory consumption, request latency, and error rates delivers valuable insights into the application's performance. Cloud providers offer built-in metrics for serverless functions, which you can visualize through dashboards. These dashboards provide a central view of the application and facilitate real-time monitoring, alerting, and troubleshooting.

Alerts and notifications

Organizations can configure thresholds for various metrics, and when those thresholds are exceeded, alerts and notifications are triggered. These alerts can be sent via email, SMS, or integrated with incident management systems, enabling prompt response to potential issues. Real-time alerts empower organizations to take immediate action and mitigate risks.

Integration with DevOps pipelines

Monitoring serverless applications should be integral to the DevOps lifecycle. Integration with the existing CI/CD pipeline allows organizations to automate monitoring setup and configuration, ensuring monitoring is in place from the early stages of development. By incorporating monitoring as code, organizations can easily manage monitoring configurations, version control them, and seamlessly integrate monitoring practices into their deployment processes.

Performance testing and load simulation

Performance testing and load simulation ensure serverless applications can efficiently handle peak loads and scale. Organizations can evaluate autoscaling configurations and optimize resource allocation by simulating high loads and monitoring the application's behavior. Load testing also helps organizations understand the limits of their serverless architecture and ensure it meets the desired performance requirements.

Best practices for serverless monitoring

Here are some best practices for serverless monitoring:

Choose the correct monitoring tools and establish clear objectives

Different monitoring tools are available for serverless computing. When choosing a monitoring tool, consider your specific needs and requirements and explore the features and functionalities of these tools to leverage their full potential. Before you implement any monitoring solution, it is necessary to define your objectives. Understand what metrics and insights are most important for your serverless application and identify key performance indicators (KPIs) such as response time, error rates, and resource utilization that align with your application's goals.

Monitor third-party dependencies

Serverless applications rely on various third-party services and APIs. Monitoring the performance and availability of these dependencies is important. Utilize synthetic monitoring tools to test the accessibility and responsiveness of external services regularly. Configure alerts to notify you when a dependency experiences issues so you can take proactive measures to mitigate the impact on your serverless application.

Log aggregation and analysis

Centralized log aggregation is essential for serverless monitoring. Capture and analyze logs from different components of your serverless application to identify errors, exceptions, and other important events. Leverage log management platforms like ELK Stack (Elasticsearch, Logstash, and Kibana), Splunk, or CloudWatch Logs to effectively store, search, and analyze logs. Implement structured logging practices to facilitate easy querying and correlation of records across different functions and services.

Implement automated alerts and notifications

Configuring automated alerts and notifications is important for proactive monitoring. Set up alerting rules based on predefined thresholds for necessary metrics. When a metric exceeds the threshold, the monitoring system should trigger alerts via email, SMS, or integrated chat platforms like Slack. It ensures that the response teams are promptly notified of any anomalies or performance issues, enabling them to take immediate action and minimize potential downtime.

Perform regular load testing

Load testing of serverless applications is essential to understand their performance limits and identify potential scalability issues. Simulate realistic workloads by generating many requests and monitoring the system's response. By analyzing the metrics collected during load testing, you can determine the application's behavior under different loads and optimize its performance accordingly. Continuous load testing helps proactively address scalability concerns and ensure smooth operations during peak usage.

Implement security monitoring

Serverless monitoring should not be limited to performance and availability; it should also include security considerations. Monitor your serverless application for potential security vulnerabilities, unauthorized access attempts, and suspicious activities. Implement security monitoring tools and techniques to detect anomalies such as excessive resource consumption, unexpected file access, or unauthorized function invocations. Security monitoring ensures the integrity and confidentiality of your serverless infrastructure and protects against potential threats.

Serverless debugging

Serverless debugging is the process of identifying and fixing errors in serverless applications. It involves troubleshooting errors and unexpected behavior to ensure smooth application execution. Serverless debugging involves examining both the application code and the underlying serverless infrastructure. It requires a thorough understanding of the event-driven nature of serverless architecture and the interactions between different components. It helps identify and resolve problems that can lead to poor performance in the application. By proactively addressing bugs and errors, developers can improve their serverless applications' overall reliability and stability. In addition, swift and accurate debugging processes reduce the time spent on troubleshooting, allowing developers to focus on building new features and enhancing application functionality.

Common errors in serverless applications

Some common errors occur in serverless applications. They include:

API throttling

It occurs when you make too many requests to an API in a short period. It can cause your application to fail to make requests. The error occurs when an application exceeds the allowed rate limit of API calls. As a result, the provider may respond with HTTP status codes such as 429 (Too Many Requests) or 503 (Service Unavailable).

Invocation and event payload issues

Errors related to incorrect invocation or event payloads are expected in serverless applications. Ensuring that the function's input parameters match the desired event structure is necessary. Mismatched payloads can lead to parsing errors, function failures, or undesired behavior. Proper validation and testing of event payloads can help identify and resolve these issues.

Insufficient resource allocation

Serverless functions are allocated a limited amount of resources, such as memory and CPU, by the cloud provider. Inadequate resource allocation can result in function timeouts, out-of-memory errors, or reduced performance.

Lack of error handling

Proper error handling is important in serverless applications to ensure graceful degradation and fault tolerance. Failing to handle errors appropriately can result in unhandled exceptions, incomplete processing of events, or silent failures. Implementing robust error-handling mechanisms, including structured error messages, logging, and exception management, is important to identify and address errors effectively.

Socket timeouts

A socket timeout occurs when a connection to the remote server times out. If the response is not received within the specified timeout period, the application assumes a failure and throws a socket timeout error. It can occur due to network latency, backend service unavailability, or inefficiencies in the application's code.

Security vulnerabilities

Serverless applications are not exempt from security vulnerabilities, and errors in security configurations can have severe consequences. Common security errors include misconfigured access controls, insecure function permissions, or insufficient data sanitization. For additional insights on serverless security, refer to our blog post on "Best practices for serverless security."

Serverless debugging techniques

Here are some techniques for debugging serverless applications:

Continuous integration/continuous delivery (CI/CD) pipeline

A CI/CD pipeline can help you automate the deployment of your serverless applications. It can help you keep your applications up-to-date and ensure that any changes are thoroughly tested before deployment.

A/B testing

A/B testing is a technique for testing changes and identifying potential issues before rolling them out to a broader audience. You can closely monitor their behavior and performance by gradually deploying new versions of serverless functions to a subset of users. You can quickly detect anomalies or regressions and roll back changes if necessary by comparing metrics and logs between the old and new versions.

End-to-end testing

It is the process of testing your entire application from start to finish. It helps ensure that all components work together seamlessly and deliver the expected outcomes. By automating end-to-end tests, developers can continuously validate the system's behavior and catch regressions as new features are added or modified. End-to-end testing can be performed using frameworks like Selenium or Puppeteer for web interfaces or API testing tools like Postman or Newman for testing RESTful APIs.

Remote debugging

It allows developers to attach a debugger to a running serverless function and inspect its execution in real time. This technique is particularly useful when troubleshooting complex issues that are difficult to reproduce in local environments. With remote debugging, you can set breakpoints, step through the code, and examine variables and states to find the cause of the problem. Many serverless platforms, including AWS Lambda, Azure Functions, and Google Cloud Functions, support remote debugging through various integrated development environments (IDEs) and tools.

Local debugging

This technique involves running and debugging serverless functions locally on your development machine. It allows you to simulate the serverless environment, and developers can test their code before deploying it to a cloud platform. Local debugging tools and frameworks like AWS SAM (Serverless Application Model) and Azure Functions Core Tools can help you with this process.

Code review and pair programming

While not strictly a debugging technique, code review and pair programming can greatly contribute to reducing the occurrence of bugs in serverless applications. By having peers review your code, you can leverage their expertise and identify potential issues before they manifest in production. Two developers work together to program the same code, promoting knowledge sharing, problem-solving, and immediate bug detection. Collaboration tools like GitHub, GitLab, and Bitbucket provide features to facilitate code reviews and foster effective teamwork.

Best practices for serverless debugging

Remember that debugging serverless applications can sometimes be more challenging than traditional architectures due to their distributed and event-driven nature. Some best practices for debugging serverless applications include:

Leverage debugging tools

Serverless platforms often provide debugging tools that allow you to set breakpoints, step through code, and inspect variables. Familiarize yourself with the debugging tools.

Use mock data and local testing

During development, use mock data or local testing frameworks to simulate the serverless environment locally. It allows you to catch issues earlier in the development cycle and decreases the need for constant deployment to the cloud.

Implement error handling

Catch and handle errors appropriately within your serverless functions. Consider using try-catch blocks to capture and handle exceptions gracefully. Ensure to include useful error messages or codes in your error responses to aid troubleshooting.

Enable logging

Make sure your serverless application logs relevant information, including error messages, stack traces, and other useful data. Use a centralized logging service to aggregate logs from all your functions. Logging can help you understand the flow of execution and identify potential issues.

Use environment variables

Store configuration values in environment variables, such as API keys or database connection strings. It allows you to change these values without modifying your code.

Version your functions

Implement version control for your serverless functions to manage updates and rollbacks effectively. Versioning allows you to trace changes and quickly return to a known working version if necessary.

Additional tips for debugging your serverless applications

  • Use a debugger to step through your code line by line. It can help you identify the source of an error.
  • Set breakpoints in your code. It will allow you to stop the execution of your code at a specific point.
  • Use the debugger to view the values of variables. It can help you track the flow of your code and identify where an error is occurring.
  • Use a monitoring tool to track the performance of your applications. It can help you identify problems that may be causing errors.
  • Use a logging tool to log errors and other important information. It can help you track down errors and troubleshoot problems.
  • Ask for help from the community. There are a number of online forums and communities where you can ask for help debugging and monitoring your software.

Tools for serverless monitoring and debugging

There are tools available to help developers monitor and debug their serverless applications. Here are some of the tools for serverless monitoring and debugging:

Amazon CloudWatch

Amazon offers CloudWatch, an Amazon Web Services (AWS) monitoring service. CloudWatch is a popular choice for serverless monitoring and debugging due to its integration with AWS Lambda. It enables users to collect and track metrics, logs, and events from various AWS resources and applications, allowing them to gain insights into the performance of their applications. CloudWatch can collect data from a wide range of sources, aggregates the collected data into meaningful metrics and statistics, and then stores the collected metrics and logs in a durable storage backend. Depending on their needs, users can retain the data for a specific period, ranging from a few days to several years. It also provides a web-based console where users can create custom dashboards to visualize their metrics and logs.


Datadog is used to monitor both serverless and traditional applications. It is a monitoring platform that offers different features and integrations to collect, analyze, and visualize data, helping you identify and resolve issues quickly. It collects data from various sources, including servers, containers, cloud providers, databases, and applications. It supports multiple data types. Datadog allows you to centralize and analyze logs from various sources. It provides distributed tracing capabilities to monitor the performance and behavior of your application. It can automatically instrument your code or integrate with existing tracing libraries to capture trace data. It also supports event monitoring and alerting.

New Relic

New Relic is another monitoring platform that is used to monitor serverless applications. It offers extensive features and capabilities to collect, analyze, and visualize data, enabling you to optimize your systems and resolve issues. New Relic provides agents or libraries that can be integrated into your applications and infrastructure components. The instrumentation process is designed to be lightweight and low-impact to minimize performance overhead. Once the agents are deployed, they start collecting data and sending it to the New Relic platform. It provides powerful analytic capabilities to analyze your monitoring data. It aligns with various technologies and services, including cloud platforms, messaging queues, etc.


Lumingo is a cloud-native serverless monitoring and debugging tool that offers a deep dive into your serverless applications. It captures and visualizes the entire flow of a request. Lumingo’s debugging features provide detailed insights into request payloads, error stacks, and execution durations, enabling you to pinpoint and resolve issues. It also supports tracing. Integrating Lumigo into your serverless applications using the provided SDK or instrumentation automatically collects and monitors various metrics, logs, and traces. The collected data is displayed on the dashboard.


Dashbird is a serverless monitoring and debugging tool that provides a view of a serverless application. It has different features for serverless monitoring, including real-time metrics, custom dashboards, and alerts. Dashbird's dashboard highlights error occurrences, stack traces, and associated logs, allowing you to identify and investigate errors within the application quickly.


AWS X-Ray is an Amazon Web Services (AWS) debugging tool. It enables you to analyze and debug distributed applications, including serverless architectures. With X-Ray, you can understand how your serverless functions and services are performing, identify any errors or latency issues, and optimize their performance. AWS X-Ray provides end-to-end tracing capabilities, allowing you to visualize the path of a request as it flows through various components of your serverless application. It helps you identify areas for improvement. The X-Ray also offers integration with other AWS services, such as CloudWatch and Lambda, to provide a comprehensive monitoring and debugging solution.


Thundra is a monitoring and debugging tool designed specifically for serverless applications. It supports various serverless platforms, including AWS Lambda, Azure Functions, and Google Cloud Functions. It offers advanced debugging capabilities, distributed tracing, logging, error monitoring, and insights into function invocations, error rates, and associated logs for efficient troubleshooting. It also provides detailed metrics, logs, and error monitoring, allowing you to identify and resolve issues in your serverless applications proactively.

Here are some factors to consider when choosing a serverless monitoring tool:

  • Features - the tool should provide the features you need to monitor your serverless applications; it includes metrics, logs, traces, and debugging capabilities
  • Ease of use - the tool should be easy to use, so you can quickly start monitoring your applications
  • Cost - the tool should be affordable, so you can monitor your applications without breaking the bank


In conclusion, the different techniques that can be used for monitoring and debugging serverless applications and the best practices for serverless debugging and monitoring have been covered in this article. Serverless computing and traditional computing models have significant differences in various aspects. The developers and the application will determine the best choice based on their needs. Nevertheless, organizations can promptly identify and resolve issues by adopting an active approach to monitoring and debugging, ensuring the optimal performance of their serverless architectures.