Graphite

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Datadog

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.

With Kibana you can visualize your Elasticsearch data and navigate the Elsatic Stack. The Kibana user interface is released free and open-source and allows you to visualize anything from query load to understanding request flows throughout your application. Kibana also integrates with popular third-party technologies such as Apache Flue, Fluentd and many more.

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.

Sqreen is an application security management platform that is changing the way that development, security and operation teams protect, observe and and test their applications. With Sqreen it's easy to get started, to deploy screen you only need to add a library to your applications. The platform supports a vide variety of languages and runtimes including Node.js, Go, Java, Python, PHP, Ruby and .NET.

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.

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.