FusionReactor is a developer and DevOps focused Java application performance monitor (APM), developed by Intergral GmbH for monitoring Java application servers such as Tomcat, WildFly.

[2] Since its initial release in November 2005, FusionReactor has been used by organizations to monitor their production environments.

[3][4] As an observability platform and APM FusionReactor offers Metrics, Automatic Error Detection, JDBC|Database monitoring, Memory/Code/Thread Tracing and Log Monitoring and is used by software developers and DevOps to pinpoint application errors and application performance bottlenecks and to find exceptions in software code.

[5] The software also has a production-grade debugging tool[6] and automated route cause analysis.

FusionReactor is used to monitor monolith applications and distributed environments such as Docker and Kubernetes.