Uso Spring Cloud Feign y Sleuth con un servidor Zipkin. Mi problema es que cuando habilito Sleuth, cualquier solicitud simple tarda al menos 600 ms. Tenga en cuenta que para fines de prueba, he establecido el porcentaje de muestra de Sleuth en 1.

¿Puedo hacer algo para mejorar eso?

Aquí hay un registro de una solicitud que tarda 25 ms sin Sleuth y 700 ms con Sleuth. (llamadas de usuarios / equipos que llaman / ciudades):

13:46:46.064 [http-nio-8080-exec-3] DEBUG o.s.c.s.instrument.web.TraceFilter - Received a request to uri [/teams] that should not be sampled [false]
13:46:46.064 [http-nio-8080-exec-3] DEBUG o.s.c.s.instrument.web.TraceFilter - No parent span present - creating a new span
13:46:46.065 [http-nio-8080-exec-3] DEBUG o.s.web.servlet.DispatcherServlet - DispatcherServlet with name 'dispatcherServlet' processing GET request for [/teams]
13:46:46.078 [http-nio-8080-exec-3] DEBUG o.s.c.s.i.w.TraceHandlerInterceptor - Handling span [Trace: 99b8ae8aa88157a6, Span: 99b8ae8aa88157a6, Parent: null, exportable:true]
13:46:46.078 [http-nio-8080-exec-3] DEBUG o.s.c.s.i.w.TraceHandlerInterceptor - Adding a method tag with value [getTeams] to a span [Trace: 99b8ae8aa88157a6, Span: 99b8ae8aa88157a6, Parent: null, exportable:true]
13:46:46.078 [http-nio-8080-exec-3] DEBUG o.s.c.s.i.w.TraceHandlerInterceptor - Adding a class tag with value [TeamService] to a span [Trace: 99b8ae8aa88157a6, Span: 99b8ae8aa88157a6, Parent: null, exportable:true]
13:46:46.083 [hystrix-cities-2] DEBUG o.s.c.s.i.h.SleuthHystrixConcurrencyStrategy$HystrixTraceCallable - Continuing span [Trace: 99b8ae8aa88157a6, Span: 99b8ae8aa88157a6, Parent: null, exportable:true]
13:46:46.084 [hystrix-cities-2] DEBUG o.s.c.s.i.w.c.feign.TraceFeignClient - Created new Feign span [Trace: 99b8ae8aa88157a6, Span: 4cea0c5e2e662ea3, Parent: 99b8ae8aa88157a6, exportable:true]
13:46:46.084 [hystrix-cities-2] DEBUG o.s.c.s.i.w.c.feign.TraceFeignClient - The modified request equals GET http://localhost:8080/cities HTTP/1.1
X-B3-ParentSpanId: 99b8ae8aa88157a6
X-B3-Sampled: 1
X-B3-TraceId: 99b8ae8aa88157a6
X-Span-Name: http:/cities
X-B3-SpanId: 4cea0c5e2e662ea3

13:46:46.101 [http-nio-8080-exec-5] DEBUG o.s.c.s.instrument.web.TraceFilter - Received a request to uri [/cities] that should not be sampled [false]
13:46:46.101 [http-nio-8080-exec-5] DEBUG o.s.c.s.instrument.web.TraceFilter - Found a parent span [Trace: 99b8ae8aa88157a6, Span: 4cea0c5e2e662ea3, Parent: 99b8ae8aa88157a6, exportable:true] in the request
13:46:46.101 [http-nio-8080-exec-5] DEBUG o.s.c.s.instrument.web.TraceFilter - Parent span is [Trace: 99b8ae8aa88157a6, Span: 4cea0c5e2e662ea3, Parent: 99b8ae8aa88157a6, exportable:true]
13:46:46.101 [http-nio-8080-exec-5] DEBUG o.s.b.w.f.OrderedRequestContextFilter - Bound request context to thread: org.apache.catalina.connector.RequestFacade@36324069
13:46:46.101 [http-nio-8080-exec-5] DEBUG o.s.web.servlet.DispatcherServlet - DispatcherServlet with name 'dispatcherServlet' processing GET request for [/cities]
13:46:46.105 [http-nio-8080-exec-5] DEBUG o.s.c.s.i.w.TraceHandlerInterceptor - Handling span [Trace: 99b8ae8aa88157a6, Span: 4cea0c5e2e662ea3, Parent: 99b8ae8aa88157a6, exportable:true]
13:46:46.105 [http-nio-8080-exec-5] DEBUG o.s.c.s.i.w.TraceHandlerInterceptor - Adding a method tag with value [getCities] to a span [Trace: 99b8ae8aa88157a6, Span: 4cea0c5e2e662ea3, Parent: 99b8ae8aa88157a6, exportable:true]
13:46:46.105 [http-nio-8080-exec-5] DEBUG o.s.c.s.i.w.TraceHandlerInterceptor - Adding a class tag with value [cityService] to a span [Trace: 99b8ae8aa88157a6, Span: 4cea0c5e2e662ea3, Parent: 99b8ae8aa88157a6, exportable:true]
13:46:46.106 [http-nio-8080-exec-5] DEBUG o.s.w.s.m.m.a.RequestResponseBodyMethodProcessor - Written [com.citymanager.entity.City@320dc277] as "application/json" using [org.springframework.http.converter.json.MappingJackson2HttpMessageConverter@33bb3f86]
13:46:46.107 [http-nio-8080-exec-5] DEBUG o.s.c.s.instrument.web.TraceFilter - Trying to send the parent span [Trace: 99b8ae8aa88157a6, Span: 4cea0c5e2e662ea3, Parent: 99b8ae8aa88157a6, exportable:true] to Zipkin
13:46:46.107 [http-nio-8080-exec-5] DEBUG o.s.c.s.z.ServerPropertiesEndpointLocator - Span will contain serviceName [city-manager]
13:46:46.109 [hystrix-cities-2] DEBUG o.s.c.s.i.w.c.feign.TraceFeignClient - Closing Feign span and logging CR [Trace: 99b8ae8aa88157a6, Span: 4cea0c5e2e662ea3, Parent: 99b8ae8aa88157a6, exportable:true]
13:46:46.109 [hystrix-cities-2] DEBUG o.s.c.s.i.w.c.feign.TraceFeignClient - Closing Feign span [Trace: 99b8ae8aa88157a6, Span: 4cea0c5e2e662ea3, Parent: 99b8ae8aa88157a6, exportable:true]
13:46:46.109 [hystrix-cities-2] DEBUG o.s.c.s.z.ServerPropertiesEndpointLocator - Span will contain serviceName [city-manager]
13:46:46.459 [http-nio-8080-exec-5] DEBUG o.s.c.s.instrument.web.TraceFilter - Closing the span [Trace: 99b8ae8aa88157a6, Span: 4cea0c5e2e662ea3, Parent: 99b8ae8aa88157a6, exportable:true] since the response was successful
13:46:46.464 [hystrix-cities-2] DEBUG o.s.w.c.HttpMessageConverterExtractor - Reading [class com.citymanager.entity.City] as "application/json;charset=UTF-8" using [org.springframework.http.converter.json.MappingJackson2HttpMessageConverter@33bb3f86]
13:46:46.465 [hystrix-cities-2] DEBUG o.s.c.s.i.h.SleuthHystrixConcurrencyStrategy$HystrixTraceCallable - Detaching span since it was continued [Trace: 99b8ae8aa88157a6, Span: 99b8ae8aa88157a6, Parent: null, exportable:true]
13:46:46.466 [http-nio-8080-exec-3] DEBUG o.s.w.s.m.m.a.RequestResponseBodyMethodProcessor - Written [com.citymanager.entity.Team@3c35ed9b] as "application/json" using [org.springframework.http.converter.json.MappingJackson2HttpMessageConverter@33bb3f86]
13:46:46.466 [http-nio-8080-exec-3] DEBUG o.s.web.servlet.DispatcherServlet - Successfully completed request
13:46:46.467 [http-nio-8080-exec-3] DEBUG o.s.c.s.instrument.web.TraceFilter - Closing the span [Trace: 99b8ae8aa88157a6, Span: 99b8ae8aa88157a6, Parent: null, exportable:true] since the response was successful
13:46:46.467 [http-nio-8080-exec-3] DEBUG o.s.c.s.z.ServerPropertiesEndpointLocator - Span will contain serviceName [city-manager]
13:46:46.857 [AsyncReporter(org.springframework.cloud.sleuth.zipkin.RestTemplateSender@42519b72)] DEBUG o.s.web.client.RestTemplate - Created POST request for "http://localhost:9411/api/v1/spans"
13:46:46.857 [AsyncReporter(org.springframework.cloud.sleuth.zipkin.RestTemplateSender@42519b72)] DEBUG o.s.web.client.RestTemplate - Setting request Accept header to [text/plain, application/json, application/*+json, */*]
13:46:46.857 [AsyncReporter(org.springframework.cloud.sleuth.zipkin.RestTemplateSender@42519b72)] DEBUG o.s.web.client.RestTemplate - Writing [[B@1aecb2f4] as "application/json" using [org.springframework.http.converter.ByteArrayHttpMessageConverter@4414cc2d]
13:46:46.885 [AsyncReporter(org.springframework.cloud.sleuth.zipkin.RestTemplateSender@42519b72)] DEBUG o.s.web.client.RestTemplate - POST request for "http://localhost:9411/api/v1/spans" resulted in 202 (null)