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spring boot samples - sdk metrics (#480)
* spring boot samples - sdk metrics Signed-off-by: Tihomir Surdilovic <tihomir@temporal.io> * spelling Signed-off-by: Tihomir Surdilovic <tihomir@temporal.io> * update Signed-off-by: Tihomir Surdilovic <tihomir@temporal.io> * fix numbering Signed-off-by: Tihomir Surdilovic <tihomir@temporal.io> * update readme Signed-off-by: Tihomir Surdilovic <tihomir@temporal.io> --------- Signed-off-by: Tihomir Surdilovic <tihomir@temporal.io>
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‎README.md‎

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@@ -140,4 +140,5 @@ See the README.md file in each main sample directory for cut/paste Gradle comman
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More info on each sample:
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- [**Hello**](/springboot/src/main/java/io/temporal/samples/springboot/hello): Invoke simple "Hello" workflow from a GET endpoint
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- [**SDK Metrics**](/springboot/src/main/java/io/temporal/samples/springboot/metrics): Learn how to set up SDK Metrics
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‎springboot/build.gradle‎

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implementation "org.springframework.boot:spring-boot-starter-thymeleaf"
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implementation "org.springframework.boot:spring-boot-starter-actuator"
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implementation "io.temporal:temporal-spring-boot-starter-alpha:$javaSDKVersion"
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runtimeOnly "io.micrometer:micrometer-registry-prometheus"
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testImplementation "org.springframework.boot:spring-boot-starter-test"
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dependencies {
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errorproneJavac('com.google.errorprone:javac:9+181-r4173-1')

‎springboot/src/main/java/io/temporal/samples/springboot/SamplesController.java‎

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// bypass thymeleaf, don't return template name just result
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return new ResponseEntity("\"" + workflow.sayHello(person) + "\"", HttpStatus.OK);
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}
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@GetMapping("/metrics")
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public String metrics(Model model) {
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model.addAttribute("sample", "SDK Metrics");
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return "metrics";
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}
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}

‎springboot/src/main/java/io/temporal/samples/springboot/metrics/README.md‎

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# SpringBoot Metrics Sample
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1. Start SpringBoot from main samples repo directory:
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./gradlew bootRun
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2. In your browser navigate to:
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http://localhost:3030/metrics
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This sample involves just SpringBoot and Actuator configurations which are
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included in the samples already. The page shows information on how to set up
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SDK metrics in your SpringBoot applications.

‎springboot/src/main/resources/application.yaml‎

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spring:
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application:
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name: temporal-samples
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# temporal specific configs
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temporal:
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connection:
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target: 127.0.0.1:7233
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# max-threads: 10
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workersAutoDiscovery:
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packages: io.temporal.samples.springboot
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# actuator (sdk metrics)
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management:
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endpoints:
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web:
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exposure:
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include: prometheus
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# specific for samples
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samples:
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data:
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language: english
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language: english

‎springboot/src/main/resources/templates/index.html‎

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<div class="list-group">
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<a href="/hello" class="list-group-item list-group-item-action">Say Hello</a>
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</div>
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<div class="list-group">
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<a href="/metrics" class="list-group-item list-group-item-action">SDK Metrics</a>
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</div>
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</div>
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</div>
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‎springboot/src/main/resources/templates/metrics.html‎

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<!DOCTYPE html>
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<html lang="en" xmlns:th="http://www.thymeleaf.org" xmlns="http://www.w3.org/1999/html">
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<head>
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<link rel="stylesheet"
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href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css"/>
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<link rel="stylesheet"
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href="https://cdnjs.cloudflare.com/ajax/libs/prism/9000.0.1/themes/prism.min.css"/>
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<link href="https://fonts.googleapis.com/css2?family=Lato:ital,wght@1,400;1,700&display=swap" rel="stylesheet">
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<script src="https://code.jquery.com/jquery-3.3.1.min.js"></script>
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<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.11.0/umd/popper.min.js"></script>
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<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>
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<script src="https://cdnjs.cloudflare.com/ajax/libs/prism/9000.0.1/prism.min.js"></script>
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</head>
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<body>
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<div class="container">
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<div class="card">
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<div class="card-body">
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<h4 class="card-title" th:text="'Temporal Java SDK Samples: ' + ${sample}">Temporal Java SDK Samples</h4>
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<h6>In this sample we show how to set up and consume SDK metrics.</h6>
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<br/><br/><br/>
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<div>
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<h6>Configuring SDK metrics is super easy using <a href="https://docs.spring.io/spring-boot/docs/current/reference/html/actuator.html" target="_blank">Spring Actuator</a></h6><br/>
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<div class="list-group">
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<a href="#" class="list-group-item list-group-item-action flex-column align-items-start">
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<div class="d-flex w-100 justify-content-between">
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<h5 class="mb-1">1. Add spring-boot-starter-actuator to project dependencies</h5>
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</div>
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<p class="mb-1">
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<pre><code>Gradle:
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<br/> implementation "org.springframework.boot:spring-boot-starter-actuator"
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</code></pre>
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<pre><code>Maven:
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<br/> &lt;dependency&gt;
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&lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;
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&lt;artifactId&gt;spring-boot-starter-actuator&lt;/artifactId&gt;
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&lt;/dependency&gt;
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</code></pre>
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</p>
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</a>
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<a href="#" class="list-group-item list-group-item-action flex-column align-items-start">
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<div class="d-flex w-100 justify-content-between">
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<h5 class="mb-1">2. Add micrometer-registry-prometheus as runtime dependency</h5>
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</div>
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<p class="mb-1">
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<pre><code>Gradle:
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<br/> runtimeOnly "io.micrometer:micrometer-registry-prometheus"
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</code></pre>
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<pre><code>Maven:
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<br/> &lt;dependency&gt;
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&lt;groupId>io.micrometer&lt;/groupId&gt;
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&lt;artifactId>micrometer-registry-prometheus&lt;/artifactId&gt;
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&lt;scope>runtime&lt;/scope&gt;
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&lt;/dependency>
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</code></pre>
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</p>
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</a>
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<a href="#" class="list-group-item list-group-item-action flex-column align-items-start">
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<div class="d-flex w-100 justify-content-between">
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<h5 class="mb-1">3. Configure Actuator in application properties/yaml</h5>
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</div>
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<p class="mb-1">
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<pre><code>management:
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endpoints:
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web:
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exposure:
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include: prometheus
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</code></pre>
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<small class="text-muted">Alternatively, you can define a custom io.micrometer.core.instrument.MeterRegistry bean in the application context.</small>
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</a>
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<a href="#" class="list-group-item list-group-item-action flex-column align-items-start">
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<div class="d-flex w-100 justify-content-between">
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<h5 class="mb-1">4. View metrics (Prometheus format)</h5>
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</div>
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<p>Actuator will expose SDK metrics automatically.<br/>
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You can access raw metrics at "localhost:3030/actuator/prometheus".<br/>
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This is already set up for the samples project.
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</p>
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<small class="text-muted">You can set up Prometheus config to scrape SDK metrics from this endpoint.</small>
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</a>
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</div>
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</div>
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</div>
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</div>
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</div>
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</body>
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</html>

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