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Prometheus is a Cloud Native Computing Foundation project for systems and service monitoring. With Prometheus you can collect metrics from configured targets at given intervals, evaluates rule expressions, displays the results, and can trigger alerts when specified conditions are observed. Prometheus include features like multi-dimensional data models. PromQL, a powerful and flexible query language to leverage this dimensionality. No dependency on distributed storage. An HTTP pull model for time series collection  and much more.

Datadog is a SaaS-based monitoring service for cloud-scale applications, providing monitoring of servers, databases, tools, and services, through a unique data analytics interface. With Datadog dog you can spot problems in your applications faster, and move quickly to fix it.

As the world's most popular free and open source technology for visualizing metrics, Graphana makes it easy to create a interactive dashboard for data monitoring. Grafana's designed from the ground-up for analyzing and visualizing metrics such as system CPU, memory, disk and I/O utilization. All metrics provided by connected data sources and applications can be visualized and monitored though charts, graphs, and alerts. You can also extend the core functionality of Graphana through a built-in plug-in system. Popular companies and applications like Uber, Robinhood, Nubank and others trust Graphana and its real-time visualization and monitoring capabilities.

With Rollbar you can roactively discover, predict, and remediate application errors with real-time, AI-assisted workflows. Rollbar is an error tracking platform for JavaScript, PHP, Ruby, Python, DotNet, Java and iOS. It's loved by developer and trusted by enterprises and allows you to deploy with confidence and deliver more value to your customers, faster.

Raygun is an application monitoring and performance insight tool that helps you and your team to proactively find, diagnose and fix software errors and performance problems. Raygun is trusted by thousands of innovative organizations that use the tool to ship better experiences to their customers.

New Relic is a commercial application and website monitoring tool. If server performance matter to you, then New Relic can help you find bottle necks in your application.