Introduction of Monitoring a web app
- Application's Health + Metrics
- Notice unwanted behavior
- Monoliths as well as microservices
- Crucial in microservices architecture
- "To measure is to know"
We are going to integrate Prometheus monitoring with a web application based on SpringBoot
- We will use following:
- Spring Boot
- Spring Boot Actuator
- Micrometer
- We are also going to do a demo with an example.
Spring Boot Actuator
- Sub-Project of Spring boot
- Production ready endpoints
- /actuator is the common prefix of these endpoints
- Protected by default
- Adjustable in application.properties
- Expose all: management.endpoints.web.exposure.include=*
Micrometer
- Vendor-Neutral application metrics facade
- Support for Prometheus and many others:
- AWS Cloudwatch, Datadog, InfluxDB/Telegraf, New Relic, ...
- Transforms /actuator/metrics data into data your monitoring system understands
- Only a vendor-specific micrometer dependency in your application is required
- pom.xml example:
- pom.xml
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-stater-actuator</artifactId> </dependency> <dependency> <groupId>io.micrometer</groupId> <artifactId>micrometer-core</artifactId> </dependency> <dependency> <groupId>io.micrometer</groupId> <artifactId>micrometer-registry-prometheus</artifactId> </dependency>
SpringBoot
- Code example
- Code example
... import io.micrometer.core.instrument.Metrics; ... private Counter runCounter = Mitrics.counter("runCounter"); ... @GetMapping("/api/demo") @Timed public String apiUse() throws InterruptedException { runCounter.increment(); log.info("Hello world app accessed on /api/demo"); return "Hello world"; }
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