@Test
	void testNoRegistration() {
		assertThat(meterRegistry.find("eureka.server.instances").gauge()).isNull();
	}
Tests for {@link EurekaInstanceMonitor} with custom tags provider.

@author Wonchul Heo
@author Olga Maciaszek-Sharma
spring-cloud-netflix-eureka-server/src/test/java/org/springframework/cloud/netflix/eureka/server/EurekaInstanceMonitorWithCustomTagsProviderTests.java