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devops(backend): expose Prometheus metrics endpoint + OTLP trace export from Spring Boot
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- Add micrometer-registry-prometheus (BOM-managed) to expose /actuator/prometheus
- Add micrometer-tracing-bridge-otel (BOM-managed) for Micrometer → OTel tracing bridge
- Add opentelemetry-spring-boot-starter 2.27.0 (pinned — not in Spring Boot BOM)
- Move management to port 8081 so Prometheus scrapes directly inside archiv-net,
  bypassing both Caddy and Spring Security's session-authenticated filter chain
- Configure otel.service.name and OTLP endpoint (default localhost:4317 for CI safety)
- Set tracing sampling probability to 1.0 in base config; override via env var in compose
- Add OTEL_EXPORTER_OTLP_ENDPOINT + MANAGEMENT_TRACING_SAMPLING_PROBABILITY to docker-compose.yml
- Expose management port 8081 inside archiv-net for Prometheus scraping
- Disable trace export in application-test.yaml (probability: 0.0) for deterministic CI

OTLP export failures are non-fatal; app starts cleanly without Tempo running.
Closes #576

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Marcel
2026-05-15 03:24:35 +02:00
parent 2eff1ab14c
commit b3e49a9504
4 changed files with 61 additions and 0 deletions
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19
backend/pom.xml
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@@ -197,6 +197,25 @@
<artifactId>jsoup</artifactId>
<version>1.18.1</version>
</dependency>
<!-- Observability: Prometheus metrics scrape endpoint (version managed by Spring Boot BOM) -->
<dependency>
<groupId>io.micrometer</groupId>
<artifactId>micrometer-registry-prometheus</artifactId>
</dependency>
<!-- Observability: Micrometer → OpenTelemetry tracing bridge (version managed by Spring Boot BOM) -->
<dependency>
<groupId>io.micrometer</groupId>
<artifactId>micrometer-tracing-bridge-otel</artifactId>
</dependency>
<!-- Observability: OTel Spring Boot auto-instrumentation — NOT in Spring Boot BOM, pinned explicitly -->
<dependency>
<groupId>io.opentelemetry.instrumentation</groupId>
<artifactId>opentelemetry-spring-boot-starter</artifactId>
<version>2.27.0</version>
</dependency>
</dependencies>