@Bean Executor mysqlExecutor() {
    return makeContextAware(
      new ZipkinMySQLStorageConfiguration().mysqlExecutor(),
      currentTraceContext
    );
  }
Sets up the MySQL tracing in Brave as an initialization.
zipkin-server/src/main/java/zipkin2/server/internal/mysql/ZipkinSelfTracingMySQLStorageConfiguration.java