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Epsilon: Java library to simplify monitoring of Java application performance and latency

Epsilon is a Java library which is designed to simplify the monitoring of Java application performance and latency. It is designed to be no more intrusive than a common logger, but yet pack capabilities to draw inferences on application performance and issue notifications where said performance breaches pre-set criterion.
Why?

Application performance commands an ever increasing importance in today's enterprise environment. It is no longer uncommon for users to mandate performance or latency requirements for applications. Such requirements are sometimes driven by legally binding agreements between business entities, covering the provision of electronic services. At other times they are driven by the need to maintain a certain qaulity of service in relation to an organization's peers or marketplace.

Monitoring performance is no longer optional for a large number of IT departments and teams in today's world; particularly in the increasingly service oriented and losely federated world of electronic commerce and communication in which we now find ourselves.
What can it do for me?

The following are amongst the numerous features of the library:

Spring(tm)/Spring(tm) AOP support: It can be configured via the Spring framework, and can easily be embedded in Spring(tm) applications either via AOP or annotations.
Statistical inferencing: Application latency can be interpreted in the context of the applications historical performance, whilst ignoring outliers introduced by abnormal terminations.
Persistent state: By default, Epsilon persists historical task durations to a configurable location. This ensures that vital statistics are not lost on application failure, and can be interrogated by other applications (e.g. spreadsheets) to provide more colour on application performance. It is also possible to specify custom persistence managers e.g. to persist durations to a relational database, or in a custom format.
Highly performant and lightweight:It does not add any additional resource or latency pressure to monitored applications and has a highly negligible footprint.
Varied notification mechanism: Epsilon supports a very simple model for issuing notifications thus making it very easy for users to add custom notification handlers. For convenience, it is also shipped with a set of notification handlers, which reduces the need for the user to implement custom functionality.
Easy to extend:In line with the "keep it simple philosophy", Epsilon is intentionally made very simple to extend and customise. Although the chances of needing to do this should be quite remote for the non-power users.
Completely free and open source:We are passionate believers in innovation through openness and collaboration. Consequently, Epsilon, like all our other products is completely free to download and use.

http://www.obix-labs.com/display/jsp/technology/epsilon.jsp

User Guide:
http://www.obix-labs.com/wiki/bin/view/Epsilon/Epsilon1_0

Filed under // java latency monitoring responsetime