AWS OpenSearch Service is a fully managed service supplied by Amazon Web Services (AWS) for deploying, managing, and scaling OpenSearch clusters in the cloud. OpenSearch Service was formerly known as Amazon Elasticsearch Service (Amazon ES) but was renamed in 2021 due to changes in the open-source project it is based on. In 2022, AWS OpenSearch Serverless was announced.

Monitoring the health and performance of IT infrastructure is crucial for practically all organizations to ensure the reliability, availability, and efficiency of an organization's technology environment. By continuously tracking servers, network devices, applications, and services, organizations can promptly detect and address issues before they escalate into significant problems and impact customers.

Loki, a log aggregation system from Grafana, uses LogQL (Loki Query Language) to query logs. Whether you're just starting or need a quick reference, this cheat sheet covers the essentials. Let's dive into the syntax and functions of LogQL to make your log querying efficient and effective.

K-NN (k-nearest neighbors) is a widely used machine learning (ML) recommendation algorithm, it is used to locate nearby documents based on vector dimensions. The algorithm can be and has been applied to numerous different use cases including image recognition, fraud detection, image recognition, and ‘other songs you might like’ feature in a music application. KNN uses proximity to provide classifications and predictions regarding the grouping of an individual data point.

With the development and increased usage of cloud-native technologies, containers, and microservices-based architectures, log monitoring has become a fundamental component of effective management for organizations. Logs offer users insights into occurring issues and assist them in understanding how their software performs over time, where it excels, and where it fails.

Apache Kafka has risen as a pivotal element in modern distributed systems, transforming data processing, storage, and distribution across diverse applications. Kafka, developed by Kafka, is an open-source distributed event streaming platform. It is designed to efficiently manage high volumes of real-time data, acting as a distributed messaging system.

A vital aspect of working in IT is that you need to effectively monitor a broad range of KPIs and metrics to ensure the smooth operation of your IT infrastructure. IT dashboards streamline this process as they are specialized dashboards designed to offer insights and track key performance indicators (KPIs) related to numerous aspects of IT operations and infrastructure.

OpenSearch Alerting enables you to manage and respond to critical events and anomalies quickly in your OpenSearch environment, making it crucial for maintaining the health and performance of your system. With OpenSearch alerting you can enhance security by monitoring for suspicious activities or security breaches in real-time. This helps improve the security posture of your organization's data infrastructure.

Monitoring all of your organization’s logs can be challenging particularly when these logs are generated by various systems, applications, and devices, often in a variety of different formats. As well as this, the sheer amount of logs produced can be overwhelming, sifting through vast amounts of log data to find relevant information becomes time-consuming and inefficient. This highlights the need for a centralized log management that can alleviate these difficulties.

If you're aiming for a position that demands strong monitoring and observability skills, thorough preparation is essential. In this comprehensive guide, we will provide an extensive list of the most frequently asked interview questions about the three pillars of observability; logs, metrics and tracing. Each question is also accompanied by detailed, well-explained answers to ensure that you fully understand the concepts and can confidently demonstrate your expertise.