├── .gitignore ├── HELP.md ├── README.md ├── build.gradle.kts ├── docs └── images │ └── zipkin.png ├── gradle └── wrapper │ └── gradle-wrapper.properties ├── gradlew ├── gradlew.bat ├── settings.gradle.kts └── src ├── main ├── kotlin │ └── com │ │ └── example │ │ └── tracing │ │ └── TracingApplication.kt └── resources │ ├── application.yaml │ └── schema.sql └── test └── kotlin └── com └── example └── tracing └── TracingApplicationTests.kt /.gitignore: -------------------------------------------------------------------------------- 1 | # Compiled class file 2 | *.class 3 | 4 | # Log file 5 | *.log 6 | 7 | # BlueJ files 8 | *.ctxt 9 | 10 | # Mobile Tools for Java (J2ME) 11 | .mtj.tmp/ 12 | 13 | # Package Files # 14 | *.jar 15 | *.war 16 | *.nar 17 | *.ear 18 | *.zip 19 | *.tar.gz 20 | *.rar 21 | 22 | # virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml 23 | hs_err_pid* 24 | -------------------------------------------------------------------------------- /HELP.md: -------------------------------------------------------------------------------- 1 | # Getting Started 2 | 3 | ### Reference Documentation 4 | For further reference, please consider the following sections: 5 | 6 | * [Official Gradle documentation](https://docs.gradle.org) 7 | * [Spring Boot Gradle Plugin Reference Guide](https://docs.spring.io/spring-boot/docs/3.0.1/gradle-plugin/reference/html/) 8 | * [Create an OCI image](https://docs.spring.io/spring-boot/docs/3.0.1/gradle-plugin/reference/html/#build-image) 9 | * [Coroutines section of the Spring Framework Documentation](https://docs.spring.io/spring/docs/6.0.3/spring-framework-reference/languages.html#coroutines) 10 | * [Spring Reactive Web](https://docs.spring.io/spring-boot/docs/3.0.1/reference/htmlsingle/#web.reactive) 11 | * [Prometheus](https://docs.spring.io/spring-boot/docs/3.0.1/reference/htmlsingle/#actuator.metrics.export.prometheus) 12 | 13 | ### Guides 14 | The following guides illustrate how to use some features concretely: 15 | 16 | * [Building a Reactive RESTful Web Service](https://spring.io/guides/gs/reactive-rest-service/) 17 | 18 | ### Additional Links 19 | These additional references should also help you: 20 | 21 | * [Gradle Build Scans – insights for your project's build](https://scans.gradle.com#gradle) 22 | 23 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Micrometer Tracing with Spring Boot WebFlux and Kotlin 2 | 3 | This repository contains a simple demo application showing the usage of [Micrometer Tracing](https://micrometer.io/docs/tracing). 4 | 5 | It contains the following features: 6 | - [Spring Boot 3 Webflux](https://docs.spring.io/spring-framework/docs/current/reference/html/web-reactive.html) 7 | - [Micrometer Tracing](https://micrometer.io/docs/tracing) 8 | - [Zipkin tracing export](https://github.com/open-telemetry/opentelemetry-java/tree/main/exporters/zipkin) 9 | - [R2DBC Database Tracing](https://github.com/spring-projects-experimental/r2dbc-micrometer-spring-boot) 10 | - Reactive logs with tracing data 11 | - Custom observations in reactive streams 12 | 13 | ![zipkin.png](docs%2Fimages%2Fzipkin.png) 14 | 15 | ## Requirements 16 | - JVM 1.7+ 17 | - Docker 18 | 19 | ## Run Demo 20 | 1. Start Zipkin Tracer via 21 | - `docker run -p 9411:9411 openzipkin/zipkin` 22 | 2. Start application with 23 | - ```./gradlew :bootRun ``` 24 | 4. Call test endpoint 25 | - http://localhost:8080/test 26 | 3. Open Zipkin UI and query for traces 27 | - http://localhost:9411/zipkin/ 28 | -------------------------------------------------------------------------------- /build.gradle.kts: -------------------------------------------------------------------------------- 1 | import org.jetbrains.kotlin.gradle.tasks.KotlinCompile 2 | 3 | val micrometer_tracing = "1.0.0" 4 | 5 | plugins { 6 | id("org.springframework.boot") version "3.0.1" 7 | id("io.spring.dependency-management") version "1.1.0" 8 | kotlin("jvm") version "1.7.22" 9 | kotlin("plugin.spring") version "1.7.22" 10 | } 11 | 12 | group = "com.example" 13 | version = "0.0.1-SNAPSHOT" 14 | java.sourceCompatibility = JavaVersion.VERSION_17 15 | 16 | repositories { 17 | mavenCentral() 18 | maven("https://repo.spring.io/snapshot") 19 | } 20 | 21 | dependencies { 22 | // Spring Initializr dependencies 23 | implementation("org.springframework.boot:spring-boot-starter-actuator") 24 | implementation("org.springframework.boot:spring-boot-starter-webflux") 25 | implementation("com.fasterxml.jackson.module:jackson-module-kotlin") 26 | implementation("io.projectreactor.kotlin:reactor-kotlin-extensions") 27 | implementation("org.jetbrains.kotlin:kotlin-reflect") 28 | implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8") 29 | implementation("org.jetbrains.kotlinx:kotlinx-coroutines-reactor") 30 | runtimeOnly("io.micrometer:micrometer-registry-prometheus") 31 | testImplementation("org.springframework.boot:spring-boot-starter-test") 32 | testImplementation("io.projectreactor:reactor-test") 33 | 34 | // R2DBC 35 | implementation("org.springframework.boot:spring-boot-starter-data-r2dbc") 36 | runtimeOnly("com.h2database:h2") 37 | runtimeOnly("io.r2dbc:r2dbc-h2") 38 | 39 | // force proxy version 40 | implementation("io.r2dbc:r2dbc-proxy:1.1.0.RELEASE") 41 | // R2DBC micrometer auto tracing 42 | implementation("org.springframework.experimental:r2dbc-micrometer-spring-boot:1.0.2-SNAPSHOT") 43 | 44 | // Added Micrometer Tracing dependencies 45 | implementation(platform("io.micrometer:micrometer-tracing-bom:$micrometer_tracing")) 46 | implementation("io.micrometer:micrometer-tracing") 47 | implementation("io.micrometer:micrometer-tracing-bridge-otel") 48 | implementation("io.opentelemetry:opentelemetry-exporter-zipkin") 49 | } 50 | 51 | tasks.withType { 52 | kotlinOptions { 53 | freeCompilerArgs = listOf("-Xjsr305=strict") 54 | jvmTarget = "17" 55 | } 56 | } 57 | 58 | tasks.withType { 59 | useJUnitPlatform() 60 | } 61 | -------------------------------------------------------------------------------- /docs/images/zipkin.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/jonas-tm/kotlin-spring-boot-tracing-example/975d16ed015faa8cb85e341b9f21cfe0f14fe4e9/docs/images/zipkin.png -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.properties: -------------------------------------------------------------------------------- 1 | distributionBase=GRADLE_USER_HOME 2 | distributionPath=wrapper/dists 3 | distributionUrl=https\://services.gradle.org/distributions/gradle-7.6-bin.zip 4 | zipStoreBase=GRADLE_USER_HOME 5 | zipStorePath=wrapper/dists 6 | -------------------------------------------------------------------------------- /gradlew: -------------------------------------------------------------------------------- 1 | #!/bin/sh 2 | 3 | # 4 | # Copyright © 2015-2021 the original authors. 5 | # 6 | # Licensed under the Apache License, Version 2.0 (the "License"); 7 | # you may not use this file except in compliance with the License. 8 | # You may obtain a copy of the License at 9 | # 10 | # https://www.apache.org/licenses/LICENSE-2.0 11 | # 12 | # Unless required by applicable law or agreed to in writing, software 13 | # distributed under the License is distributed on an "AS IS" BASIS, 14 | # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 | # See the License for the specific language governing permissions and 16 | # limitations under the License. 17 | # 18 | 19 | ############################################################################## 20 | # 21 | # Gradle start up script for POSIX generated by Gradle. 22 | # 23 | # Important for running: 24 | # 25 | # (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is 26 | # noncompliant, but you have some other compliant shell such as ksh or 27 | # bash, then to run this script, type that shell name before the whole 28 | # command line, like: 29 | # 30 | # ksh Gradle 31 | # 32 | # Busybox and similar reduced shells will NOT work, because this script 33 | # requires all of these POSIX shell features: 34 | # * functions; 35 | # * expansions «$var», «${var}», «${var:-default}», «${var+SET}», 36 | # «${var#prefix}», «${var%suffix}», and «$( cmd )»; 37 | # * compound commands having a testable exit status, especially «case»; 38 | # * various built-in commands including «command», «set», and «ulimit». 39 | # 40 | # Important for patching: 41 | # 42 | # (2) This script targets any POSIX shell, so it avoids extensions provided 43 | # by Bash, Ksh, etc; in particular arrays are avoided. 44 | # 45 | # The "traditional" practice of packing multiple parameters into a 46 | # space-separated string is a well documented source of bugs and security 47 | # problems, so this is (mostly) avoided, by progressively accumulating 48 | # options in "$@", and eventually passing that to Java. 49 | # 50 | # Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS, 51 | # and GRADLE_OPTS) rely on word-splitting, this is performed explicitly; 52 | # see the in-line comments for details. 53 | # 54 | # There are tweaks for specific operating systems such as AIX, CygWin, 55 | # Darwin, MinGW, and NonStop. 56 | # 57 | # (3) This script is generated from the Groovy template 58 | # https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt 59 | # within the Gradle project. 60 | # 61 | # You can find Gradle at https://github.com/gradle/gradle/. 62 | # 63 | ############################################################################## 64 | 65 | # Attempt to set APP_HOME 66 | 67 | # Resolve links: $0 may be a link 68 | app_path=$0 69 | 70 | # Need this for daisy-chained symlinks. 71 | while 72 | APP_HOME=${app_path%"${app_path##*/}"} # leaves a trailing /; empty if no leading path 73 | [ -h "$app_path" ] 74 | do 75 | ls=$( ls -ld "$app_path" ) 76 | link=${ls#*' -> '} 77 | case $link in #( 78 | /*) app_path=$link ;; #( 79 | *) app_path=$APP_HOME$link ;; 80 | esac 81 | done 82 | 83 | APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit 84 | 85 | APP_NAME="Gradle" 86 | APP_BASE_NAME=${0##*/} 87 | 88 | # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 89 | DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"' 90 | 91 | # Use the maximum available, or set MAX_FD != -1 to use that value. 92 | MAX_FD=maximum 93 | 94 | warn () { 95 | echo "$*" 96 | } >&2 97 | 98 | die () { 99 | echo 100 | echo "$*" 101 | echo 102 | exit 1 103 | } >&2 104 | 105 | # OS specific support (must be 'true' or 'false'). 106 | cygwin=false 107 | msys=false 108 | darwin=false 109 | nonstop=false 110 | case "$( uname )" in #( 111 | CYGWIN* ) cygwin=true ;; #( 112 | Darwin* ) darwin=true ;; #( 113 | MSYS* | MINGW* ) msys=true ;; #( 114 | NONSTOP* ) nonstop=true ;; 115 | esac 116 | 117 | CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar 118 | 119 | 120 | # Determine the Java command to use to start the JVM. 121 | if [ -n "$JAVA_HOME" ] ; then 122 | if [ -x "$JAVA_HOME/jre/sh/java" ] ; then 123 | # IBM's JDK on AIX uses strange locations for the executables 124 | JAVACMD=$JAVA_HOME/jre/sh/java 125 | else 126 | JAVACMD=$JAVA_HOME/bin/java 127 | fi 128 | if [ ! -x "$JAVACMD" ] ; then 129 | die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME 130 | 131 | Please set the JAVA_HOME variable in your environment to match the 132 | location of your Java installation." 133 | fi 134 | else 135 | JAVACMD=java 136 | which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 137 | 138 | Please set the JAVA_HOME variable in your environment to match the 139 | location of your Java installation." 140 | fi 141 | 142 | # Increase the maximum file descriptors if we can. 143 | if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then 144 | case $MAX_FD in #( 145 | max*) 146 | MAX_FD=$( ulimit -H -n ) || 147 | warn "Could not query maximum file descriptor limit" 148 | esac 149 | case $MAX_FD in #( 150 | '' | soft) :;; #( 151 | *) 152 | ulimit -n "$MAX_FD" || 153 | warn "Could not set maximum file descriptor limit to $MAX_FD" 154 | esac 155 | fi 156 | 157 | # Collect all arguments for the java command, stacking in reverse order: 158 | # * args from the command line 159 | # * the main class name 160 | # * -classpath 161 | # * -D...appname settings 162 | # * --module-path (only if needed) 163 | # * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables. 164 | 165 | # For Cygwin or MSYS, switch paths to Windows format before running java 166 | if "$cygwin" || "$msys" ; then 167 | APP_HOME=$( cygpath --path --mixed "$APP_HOME" ) 168 | CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" ) 169 | 170 | JAVACMD=$( cygpath --unix "$JAVACMD" ) 171 | 172 | # Now convert the arguments - kludge to limit ourselves to /bin/sh 173 | for arg do 174 | if 175 | case $arg in #( 176 | -*) false ;; # don't mess with options #( 177 | /?*) t=${arg#/} t=/${t%%/*} # looks like a POSIX filepath 178 | [ -e "$t" ] ;; #( 179 | *) false ;; 180 | esac 181 | then 182 | arg=$( cygpath --path --ignore --mixed "$arg" ) 183 | fi 184 | # Roll the args list around exactly as many times as the number of 185 | # args, so each arg winds up back in the position where it started, but 186 | # possibly modified. 187 | # 188 | # NB: a `for` loop captures its iteration list before it begins, so 189 | # changing the positional parameters here affects neither the number of 190 | # iterations, nor the values presented in `arg`. 191 | shift # remove old arg 192 | set -- "$@" "$arg" # push replacement arg 193 | done 194 | fi 195 | 196 | # Collect all arguments for the java command; 197 | # * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of 198 | # shell script including quotes and variable substitutions, so put them in 199 | # double quotes to make sure that they get re-expanded; and 200 | # * put everything else in single quotes, so that it's not re-expanded. 201 | 202 | set -- \ 203 | "-Dorg.gradle.appname=$APP_BASE_NAME" \ 204 | -classpath "$CLASSPATH" \ 205 | org.gradle.wrapper.GradleWrapperMain \ 206 | "$@" 207 | 208 | # Stop when "xargs" is not available. 209 | if ! command -v xargs >/dev/null 2>&1 210 | then 211 | die "xargs is not available" 212 | fi 213 | 214 | # Use "xargs" to parse quoted args. 215 | # 216 | # With -n1 it outputs one arg per line, with the quotes and backslashes removed. 217 | # 218 | # In Bash we could simply go: 219 | # 220 | # readarray ARGS < <( xargs -n1 <<<"$var" ) && 221 | # set -- "${ARGS[@]}" "$@" 222 | # 223 | # but POSIX shell has neither arrays nor command substitution, so instead we 224 | # post-process each arg (as a line of input to sed) to backslash-escape any 225 | # character that might be a shell metacharacter, then use eval to reverse 226 | # that process (while maintaining the separation between arguments), and wrap 227 | # the whole thing up as a single "set" statement. 228 | # 229 | # This will of course break if any of these variables contains a newline or 230 | # an unmatched quote. 231 | # 232 | 233 | eval "set -- $( 234 | printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" | 235 | xargs -n1 | 236 | sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' | 237 | tr '\n' ' ' 238 | )" '"$@"' 239 | 240 | exec "$JAVACMD" "$@" 241 | -------------------------------------------------------------------------------- /gradlew.bat: -------------------------------------------------------------------------------- 1 | @rem 2 | @rem Copyright 2015 the original author or authors. 3 | @rem 4 | @rem Licensed under the Apache License, Version 2.0 (the "License"); 5 | @rem you may not use this file except in compliance with the License. 6 | @rem You may obtain a copy of the License at 7 | @rem 8 | @rem https://www.apache.org/licenses/LICENSE-2.0 9 | @rem 10 | @rem Unless required by applicable law or agreed to in writing, software 11 | @rem distributed under the License is distributed on an "AS IS" BASIS, 12 | @rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | @rem See the License for the specific language governing permissions and 14 | @rem limitations under the License. 15 | @rem 16 | 17 | @if "%DEBUG%"=="" @echo off 18 | @rem ########################################################################## 19 | @rem 20 | @rem Gradle startup script for Windows 21 | @rem 22 | @rem ########################################################################## 23 | 24 | @rem Set local scope for the variables with windows NT shell 25 | if "%OS%"=="Windows_NT" setlocal 26 | 27 | set DIRNAME=%~dp0 28 | if "%DIRNAME%"=="" set DIRNAME=. 29 | set APP_BASE_NAME=%~n0 30 | set APP_HOME=%DIRNAME% 31 | 32 | @rem Resolve any "." and ".." in APP_HOME to make it shorter. 33 | for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi 34 | 35 | @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 36 | set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m" 37 | 38 | @rem Find java.exe 39 | if defined JAVA_HOME goto findJavaFromJavaHome 40 | 41 | set JAVA_EXE=java.exe 42 | %JAVA_EXE% -version >NUL 2>&1 43 | if %ERRORLEVEL% equ 0 goto execute 44 | 45 | echo. 46 | echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 47 | echo. 48 | echo Please set the JAVA_HOME variable in your environment to match the 49 | echo location of your Java installation. 50 | 51 | goto fail 52 | 53 | :findJavaFromJavaHome 54 | set JAVA_HOME=%JAVA_HOME:"=% 55 | set JAVA_EXE=%JAVA_HOME%/bin/java.exe 56 | 57 | if exist "%JAVA_EXE%" goto execute 58 | 59 | echo. 60 | echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 61 | echo. 62 | echo Please set the JAVA_HOME variable in your environment to match the 63 | echo location of your Java installation. 64 | 65 | goto fail 66 | 67 | :execute 68 | @rem Setup the command line 69 | 70 | set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar 71 | 72 | 73 | @rem Execute Gradle 74 | "%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %* 75 | 76 | :end 77 | @rem End local scope for the variables with windows NT shell 78 | if %ERRORLEVEL% equ 0 goto mainEnd 79 | 80 | :fail 81 | rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of 82 | rem the _cmd.exe /c_ return code! 83 | set EXIT_CODE=%ERRORLEVEL% 84 | if %EXIT_CODE% equ 0 set EXIT_CODE=1 85 | if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE% 86 | exit /b %EXIT_CODE% 87 | 88 | :mainEnd 89 | if "%OS%"=="Windows_NT" endlocal 90 | 91 | :omega 92 | -------------------------------------------------------------------------------- /settings.gradle.kts: -------------------------------------------------------------------------------- 1 | rootProject.name = "tracing" 2 | -------------------------------------------------------------------------------- /src/main/kotlin/com/example/tracing/TracingApplication.kt: -------------------------------------------------------------------------------- 1 | package com.example.tracing 2 | 3 | import io.micrometer.context.ContextSnapshot 4 | import io.micrometer.observation.Observation 5 | import io.micrometer.observation.ObservationRegistry 6 | import io.micrometer.observation.contextpropagation.ObservationThreadLocalAccessor 7 | import kotlinx.coroutines.* 8 | import kotlinx.coroutines.flow.* 9 | import kotlinx.coroutines.reactor.awaitSingle 10 | import kotlinx.coroutines.reactor.awaitSingleOrNull 11 | import kotlinx.coroutines.reactor.mono 12 | import org.slf4j.LoggerFactory 13 | import org.springframework.boot.autoconfigure.SpringBootApplication 14 | import org.springframework.boot.runApplication 15 | import org.springframework.data.annotation.Id 16 | import org.springframework.data.relational.core.mapping.Table 17 | import org.springframework.data.repository.kotlin.CoroutineCrudRepository 18 | import org.springframework.web.bind.annotation.GetMapping 19 | import org.springframework.web.bind.annotation.RestController 20 | import org.springframework.web.reactive.function.client.WebClient 21 | import reactor.core.publisher.Mono 22 | import kotlin.time.Duration.Companion.seconds 23 | 24 | @SpringBootApplication 25 | class TracingApplication 26 | 27 | fun main(args: Array) { 28 | runApplication(*args) 29 | } 30 | 31 | @RestController 32 | class Controller( 33 | val observationRegistry: ObservationRegistry, 34 | val todoRepo: ToDoRepository, 35 | webClientBuilder: WebClient.Builder 36 | ) { 37 | 38 | val webClient = webClientBuilder 39 | .baseUrl("https://jsonplaceholder.typicode.com") 40 | .build() 41 | 42 | val log = LoggerFactory.getLogger(javaClass) 43 | 44 | @GetMapping("/test") 45 | suspend fun test(): String { 46 | observeCtx { 47 | val currentObservation = observationRegistry.currentObservation 48 | currentObservation?.highCardinalityKeyValue("test_key", "test sample value") 49 | log.info("test log with tracing info") 50 | } 51 | 52 | runObserved("delay", observationRegistry) { 53 | delay(1.seconds) 54 | } 55 | 56 | // Sample traced DB call 57 | val dbTodos = todoRepo.findAll().toList() 58 | 59 | // make web client call and return response 60 | val externalTodos = webClient.get() 61 | .uri("/todos/1") 62 | .retrieve() 63 | .bodyToMono(String::class.java) 64 | .awaitSingle() 65 | 66 | return "${dbTodos.size} $externalTodos" 67 | } 68 | } 69 | 70 | @Table("todo") 71 | data class ToDo( 72 | @Id 73 | val id: Long = 0, 74 | val title: String, 75 | ) 76 | 77 | interface ToDoRepository : CoroutineCrudRepository 78 | 79 | suspend inline fun observeCtx(crossinline f: () -> Unit) { 80 | Mono.deferContextual { contextView -> 81 | ContextSnapshot.setThreadLocalsFrom( 82 | contextView, 83 | ObservationThreadLocalAccessor.KEY 84 | ).use { 85 | f() 86 | Mono.empty() 87 | } 88 | }.awaitSingleOrNull() 89 | } 90 | 91 | suspend fun runObserved(name: String, observationRegistry: ObservationRegistry, f: suspend () -> Unit) { 92 | Mono.deferContextual { contextView -> 93 | ContextSnapshot.setThreadLocalsFrom( 94 | contextView, 95 | ObservationThreadLocalAccessor.KEY 96 | ).use { 97 | val observation = Observation.start(name, observationRegistry) 98 | Mono.just(observation).flatMap { 99 | mono { f() } 100 | }.doOnError { 101 | observation.error(it) 102 | observation.stop() 103 | }.doOnSuccess { 104 | observation.stop() 105 | } 106 | } 107 | }.awaitSingleOrNull() 108 | } 109 | -------------------------------------------------------------------------------- /src/main/resources/application.yaml: -------------------------------------------------------------------------------- 1 | spring.output.ansi.enabled: always 2 | 3 | management: 4 | endpoints.web.exposure.include: '*' # health,info,prometheus 5 | metrics.distribution.percentiles-histogram.http.server.requests: true 6 | 7 | tracing: 8 | enabled: true 9 | sampling.probability: 1.0 10 | 11 | zipkin.tracing.endpoint: http://localhost:9411/api/v2/spans 12 | 13 | logging.pattern.level: "trace_id=%mdc{traceId} span_id=%mdc{spanId} trace_flags=%mdc{traceFlags} %p" 14 | -------------------------------------------------------------------------------- /src/main/resources/schema.sql: -------------------------------------------------------------------------------- 1 | CREATE TABLE IF NOT EXISTS todo( 2 | id BIGINT NOT NULL AUTO_INCREMENT PRIMARY KEY, 3 | title VARCHAR(255) NOT NULL 4 | ); 5 | -------------------------------------------------------------------------------- /src/test/kotlin/com/example/tracing/TracingApplicationTests.kt: -------------------------------------------------------------------------------- 1 | package com.example.tracing 2 | 3 | import org.junit.jupiter.api.Test 4 | import org.springframework.boot.test.context.SpringBootTest 5 | 6 | @SpringBootTest 7 | class TracingApplicationTests { 8 | 9 | @Test 10 | fun contextLoads() { 11 | } 12 | 13 | } 14 | --------------------------------------------------------------------------------