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Better monitoring with Spring boot Actuator
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Dimitri
July 27, 2020
Programming
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Better monitoring with Spring boot Actuator
An overview of the features Spring boot actuator has to offer.
Dimitri
July 27, 2020
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Transcript
Better monitoring with Spring boot Actuator
What is Spring boot Actuator? • Spring boot library •
Adds production-ready features • Provides useful endpoints • Both over HTTP and JMX
Which endpoints are there? • Auditevents • Beans • Caches
• Conditions • Configprops • Env • Flyway • Health • Heapdump • Httptrace • Info • Integrationgraph • Jolokia • Logfile • Loggers • Liquibase • Metrics • Mappings • Prometheus • Scheduledtasks • Sessions • Shutdown • Threaddump
How do I get started?
Add a dependency... <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-actuator</artifactId> </dependency>
… and configure what you need management: endpoints: web: exposure:
include: env, info, health, metrics
And… what now?
Visit /actuator { "_links": { "self": { "href": "http://192.168.0.220:8080/actuator", "templated":
false }, "health": { "href": "http://192.168.0.220:8080/actuator/health", "templated": false } }
Exploring the conditions endpoint
What does it do? • Which autoconfigurations are in use
• Why are they (not) applied? • What can I do to make it work?
Visit /actuator/conditions { "positiveMatches": {/* ... */}, "negativeMatches": { "RabbitHealthContributorAutoConfiguration":
{ "notMatched": [ { "condition": "OnClassCondition", "message": "@ConditionalOnClass did not find required class 'org.springframework.amqp.rabbit.core.RabbitTemplate'" } ]
Exploring the env endpoint
What does it do? • Which application properties are loaded?
• Where do these properties come from?
Visit /actuator/env { "activeProfiles": [ "dev" ], "propertySources": [ {
"name": "applicationConfig: [classpath:/application-dev.yml]", "properties": { "server.port": { "value": 8080, "origin": "class path resource [application-dev.yml]:2:9"
Exploring the health endpoint
What does it do? • Is the database available? •
Is there enough disk space? • Is Eureka available? • Is Solr available? • Useful for monitoring software • ...
Visit /actuator/health { "status": "UP" }
Showing detailed health info management: endpoint: health: show-details: always
Showing detailed health info { "status": "UP", "components": { "db":
{ "status": "UP", "details": { "database": "DB2 UDB for AS/400", "validationQuery": "SELECT 1 FROM SYSIBM.SYSDUMMY1", "result": 1 } }
Creating a custom health indicator @Component @RequiredArgsConstructor public class GitHubAPIHealthIndicator
implements HealthIndicator { private final RestTemplate restTemplate; @Override public Health health() { // TODO: implement } }
Creating a custom health indicator try { var result =
restTemplate.getForEntity("https://api.github.com/", ObjectNode.class); if (result.getStatusCode().is2xxSuccessful() && result.getBody() != null) { return Health.up().build(); } else { return Health.down().withDetail("status", result.getStatusCode()).build(); } } catch (RestClientException ex) { return Health.down().withException(ex).build(); }
Creating a custom health indicator { "status": "UP", "components": {
"gitHubAPI": { "status": "UP" } } }
Useful for monitoring
Useful for Eureka
Exploring the heapdump endpoint
What does it do? • Returns *.HPROF file • Can
be imported in JVisualVM, … • Find memory leaks and other peformance issues
Open the *.HPROF file
Exploring the info endpoint
What does it do? • Returns additional information • By
default empty • Useful in combination with Maven resource filtering
Configuring info info: contributors: Dimitri Mestdagh project-version: @project-version@ build-timestamp: @maven.build.timestamp@
Visit /actuator/info { "contributors": "Dimitri Mestdagh", "project-version": "0.0.1-SNAPSHOT", "build-timestamp": "2020-06-27
11:52:30" }
Exploring the loggers endpoint
What does it do? • What logging levels are in
use? • Change runtime logging levels • Useful for debugging
Visit /actuator/loggers { "loggers": { "ROOT": { "configuredLevel": "INFO", "effectiveLevel":
"INFO" }, "be.g00glen00b": { "configuredLevel": null, "effectiveLevel": "INFO" } } }
Changing the runtime logger levels curl \ --header "Content-Type: application/json"
\ --request POST \ --data '{"configuredLevel": "DEBUG"}' \ http://localhost:8080/actuator/loggers/be.g00glen00b
Exploring the metrics endpoint
What does it do? • Application metrics • Uses micrometer
• Counters • Gauges • Distribution summaries • Percentiles • Timers
Visit /actuator/metrics { "names": [ "cache.evictions", "http.server.requests", "jvm.threads.states", "hystrix.execution", "spring.batch.chunk.write",
"spring.batch.item.process", "hystrix.latency.total", "jvm.memory.used" ] }
Visit /actuator/metrics/{metric} { "name": "jvm.memory.used", "description": "The amount of used
memory", "baseUnit": "bytes", "measurements": [{ "statistic": "VALUE", "value": 196616376 }], "availableTags": [{ "tag": "area", "values": ["heap", "nonheap"] }]
Visit /actuator/metrics/{metric}?tag=area:heap { "name": "jvm.memory.used", "description": "The amount of used
memory", "baseUnit": "bytes", "measurements": [{ "statistic": "VALUE", "value": 196616376 }], "availableTags": [] }
Creating custom counter metrics @Bean public Counter invoicesCounter(MeterRegistry registry) {
return Counter .builder("invoices.created") .description("Amount of invoices created") .register(registry); }
Creating custom counter metrics @PostMapping public CreatedInvoiceDTO create(@RequestBody InvoiceParametersDTO parameters)
{ counter.increment(); // Add this return facade.create(parameters); }
Creating custom gauge metrics @Bean public Gauge countOrdersGauge(MeterRegistry registry, OrderRepository
repository) { return Gauge .builder("order.count", repository::count) .description("Amount of registered orders”) .register(registry); }
Cool stuff… but why?
Cool stuff… but why? • Production-readiness • Better monitoring •
Better logging • Better debugging = More happy people
Resources • https://docs.spring.io/spring-boot/docs/current/reference/html/p roduction-ready-features.html • https://dimitr.im/mastering-spring-boot-actuator Shameless self-promotion
Thank you for listening!