Starting with Nexus 2.x, we have begun to expose metrics data via JMX.
Starting Nexus 2.5, we have included more friendly 'metrics' REST endpoints which can give you greater detail about the health and performance of your Nexus instance.
Included are the following endpoints:
These endpoints can be viewed by a nexus Administrator or a user assigned the "Metrics Endpoints" role or permission.
For more information, refer to https://issues.sonatype.org/browse/NEXUS-5676 .