Application Response Measurement (ARM) is an Open Group standard composed of a set of interfaces implemented by an ARM agent that provides information on elapsed time for process hops.
WebSphere Application Server does not provide an ARM agent. Contact your ARM agent provider for information on whether their ARM agent is supported with WebSphere Application Server. One product that uses ARM agents is described in Tivoli performance monitoring and management solutions
See the article Performance: Resources for learning for more information about the ARM specifications.