Differences between PMI and request metrics
Performance Monitoring Infrastructure (PMI) provides information about average system resource usage statistics, with no correlation between the data across different WAS components. For example, PMI provides information about average thread pool usage.
Request metrics provides data about each individual transaction, correlating this information across the various WAS components to provide an end-to-end picture of the transaction.
Related concepts
Data we can collect with request metricsPerformance Monitoring Infrastructure