el4j-observability

Event logging For Java: El4j

Setup instructions:

Groovy setup example:

repositories { 
    mavenLocal()
}

dependencies {
    implementation 'io.github.tkasozi:el4j-observability:0.0.1-SNAPSHOT'
}

Example using yaml:

elf4j.metrics.adminRole: admin
elf4j.metrics.adminPageName: adminPage
elf4j.metrics.logging.ttl: 60 # seconds, default 604800s

elf4j.metrics.logging.extra.monitoring.enabled: true # default false
elf4j.metrics.logging.extra.monitoring.ttl: 60 # seconds, default 86400s
elf4j.metrics.logging.extra.packages:
  -
    name: com.experiment.utils
    level: ALL
  -
    name: com.experiment.internal
    level: ERROR

Example using properties:

elf4j.metrics.adminRole=admin
elf4j.metrics.adminPageName=adminPage
elf4j.metrics.logging.ttl=60 # seconds, default 604800s

elf4j.metrics.logging.extra.monitoring.enabled=true # default false
elf4j.metrics.logging.extra.monitoring.ttl=60 # seconds, default 86400s

elf4j.metrics.logging.extra.packages[0]=com.experiment.utils,ALL
elf4j.metrics.logging.extra.packages[1]=com.experiment.internal,ERROR

UI metrics collection:

Add the following to your html file.

<script>
    const observer = new PerformanceObserver((list) => {
        const entries = list.getEntries();
        const lastEntry = entries[entries.length - 1]; // Use the latest LCP candidate
        const time = lastEntry.startTime;//startTime;
        const pathname = window.location.pathname;
        window.fetch(`/observer/v1/ui/performance?pathname=${pathname}&time=${time}`);
    });
    window.addEventListener("load", () => observer.observe({type: "largest-contentful-paint", buffered: true}));
</script>