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Implement observability

Add logging, metrics, and tracing to monitor application health.

Logging​

Frontend logging​

Use structured logging:

import { logger } from "@/lib/logger";

logger.info("Dataset fetched", { datasetId, userId });
logger.error("Fetch failed", { error, context });

Backend logging​

Use SLF4J with Quarkus:

@Inject
Logger log;

public Dataset findById(Long id) {
    log.info("Fetching dataset {}", id);
    Dataset dataset = repository.findById(id);
    log.debug("Found dataset: {}", dataset);
    return dataset;
}

Metrics​

Quarkus metrics​

Enable Micrometer metrics in application.properties:

quarkus.micrometer.enabled=true
quarkus.micrometer.export.prometheus.enabled=true

Access metrics at /q/metrics.

Custom metrics​

Track business metrics:

@Inject
MeterRegistry registry;

public void recordDatasetCreation() {
    registry.counter("datasets.created").increment();
}

Distributed tracing​

Enable OpenTelemetry for request tracing across services:

quarkus.opentelemetry.enabled=true
quarkus.opentelemetry.tracer.exporter.otlp.endpoint=http://jaeger:4317

View traces in Jaeger UI to debug cross-service issues.