Software systems require continual modification to meet changing requirements, address errors, improve performance and enhance reliability. Yet, maintaining and modifying complex and distributed software systems as they change and grow can present challenges. When systems are designed with observability and explainability in mind, adapting, expanding and troubleshooting software becomes easier and more effective. Observability refers to the ability to discern and monitor software systems’ real-time behavior and performance. This allows developers to identify and fix issues before they become critical. Explainability articulates how and why the software system operates.
Both observability and explainability can contribute to the health of the software development life cycle by improving visibility and transparency, helping developers better understand the system’s overall behavior, and allowing the easy identification of errors, all of which contribute to the software system’s overall stability.
Overview and Benefits of Observability
Observability combines data from various sources, including application performance management (APM) monitoring, infrastructure monitoring, distributed tracing, third-party integrations and machine-language data. The data is then structured and presented in an accessible way. The first step to building an observable workflow is to identify which metrics best measure the behavior and performance of a software system. This will vary based on the specifics of the system. As a software system operates, logs and traces keep track of activities, requests and responses. They can be used to find the causes of errors and performance bottlenecks. Application performance monitoring (APM), infrastructure logs, machine logs and application traces are just a few examples of logs and traces. These records provide the necessary data to create dashboards and visualizations, which can then be presented to organizational stakeholders.
While observability is often compared to software monitoring, which generates data focusing on various metrics related to application performance, it differs from monitoring in several respects. Monitoring tracks raw data related to a few performance metrics. It provides information that is best used by the operations team. Observability uses a large amount of structured data to provide a more robust, accessible picture of the whole system, from front end to back end, that can be understood by employees throughout the organization—even those who do not work in development or lack a technical background entirely.
Advantages of Explainability
Explainability refers to transforming machine data into a clear articulation of how a software system works such that others outside the organization can understand it. This capability empowers developers and users alike by enabling them to understand what a software system does and how and why it does it, providing a deeper understanding of why errors occur and how to fix them. Presenting data in a visual format is often a vital part of explainability.
Explainability is especially important in artificial intelligence (AI) and machine learning (ML) systems, where it constitutes a cornerstone of ethical AI development. Model tracing, which refers to monitoring an ML model as it executes to understand its decision-making process better, is a key component of explainability in ML.
Best Practices and Common Issues With Observability and Explainability
Before adding observability or explainability to the software development life cycle, it is important to revisit software life cycle best practices and examine what kind of data is being generated. Not all data is meaningful or useful in observability and explainability. Structuring and ordering data from logs and traces is time-consuming but vital to correctly analyze and draw conclusions from the data. For optimal results, it is important for traces to be appropriately tagged and named consistently according to conventions.
Additionally, the tools used to implement observability and explainability can be complex. For organizations to achieve maximum benefits from these strategies, it’s important for employees to familiarize themselves with the tools and develop specialized knowledge and skills, which can take time. Finally, there are costs associated with implementing observability and explainability. On one hand, commercial software tools come with licensing costs, which can pose a barrier for small businesses. On the other hand, open source alternatives often do not perform well because they lack the funding and resources required to continuously update and enhance the software.
Harnessing the Power of Observability and Explainability
Observability and explainability have numerous benefits for organizations that use flexible, ever-changing and complex software systems. Any company interested in building smoother-functioning software applications stands to benefit. Though both observability and explainability require upfront investments of time and money, these investments pay off in the form of quicker and easier error correction, with resolution occurring in minutes rather than hours or days, and greater application stability. In customer-facing applications, this results in fewer crashes and a better experience for the user. Increased stability also makes it easier to scale applications without losing performance. As these benefits become more apparent, a significant number of companies will likely develop software solutions that are reliable, cost-effective and accessible. This will increase the adoption of observability and explainability, which will continue to influence the evolution of software systems.