Micrometer - SLF4J but for metrics

Nice tool to try, Micrometer is - facade over the instrumentation clients for a number of popular monitoring systems. Currently, it supports the following monitoring systems: Atlas, Datadog, Graphite, Ganglia, Influx, JMX and Prometheus. More in tutorial

Syntaxis is simple and straightforward:

 Metrics.counter("objects.instance").increment();

Configuring VisualVM with tomcat + linux

VisualVM is a tool that provides a visual interface for viewing detailed information about Java applications while they are running on a Java Virtual Machine (JVM), and for troubleshooting and profiling these applications.