Remove unnecessary sampler

zipkin/src/main/java/demo/ZipkinApplication.java

@@ -5,9 +5,9 @@ import org.slf4j.LoggerFactory;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
-import org.springframework.cloud.sleuth.sampler.AlwaysSampler;
 import org.springframework.cloud.sleuth.zipkin.ZipkinSpanReporter;
 import org.springframework.context.annotation.Bean;
+
 import zipkin.Span;
 
 @SpringBootApplication
@@ -15,11 +15,6 @@ public class ZipkinApplication {
 
 	private static Logger log = LoggerFactory.getLogger(ZipkinApplication.class);
 
-	@Bean
-	public AlwaysSampler alwaysSampler() {
-		return new AlwaysSampler();
-	}
-
 	// Use this for debugging (or if there is no Zipkin server running on port 9411)
 	@Bean
 	@ConditionalOnProperty(value="sample.zipkin.enabled", havingValue="false")