tracer.java

@Bean
public Tracer jaegerTracer() {
    // The following environment variables need to set
    // JAEGER_ENDPOINT="http://10.42.126.171:28019/api/traces"
    // JAEGER_PROPAGATION="b3"
    // JAEGER_TRACEID_128BIT="true" Use 128bit tracer id to be compatible with the
    // trace id generated by istio/envoy
    return Configuration.fromEnv("eshop-opentracing").getTracer();
}