https://github.com/spring-projects/spring-framework: Spring Core (Spring IO)
  • Juergen Hoeller 
Support package for recording metrics during application startup.

/**
 * Support package for recording metrics during application startup.
 */
@NonNullApi
@NonNullFields
package org.springframework.core.metrics;

import org.springframework.lang.NonNullApi;
import org.springframework.lang.NonNullFields;