spring-boot-demo/observability/compose.yaml at 03bdf7ee87bd78ebe9b7e23150721da9f8f6317f - spring-boot-demo - Gitea: Git with a cup of tea

asmhatre/spring-boot-demo

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Claude 03bdf7ee87 Add observability: real OTLP metrics/traces to grafana/otel-lgtm, Docker Compose auto-wiring, and a dual-version (Boot 4.0 vs 4.1) proof of the new OTEL_* env var support

Companion module for the rewritten ankurm.com Prometheus/Grafana monitoring post. Verified
against a real running grafana/otel-lgtm container (not mocked): 8 real requests produce a real
orders_placed_total metric queried back from the bundled Prometheus-compatible API with zero
management.otlp.* properties, auto-wired entirely by Boot's Docker Compose service-connection
detection. Two real findings surfaced along the way and documented rather than smoothed over:
@Observed silently produces no span without an explicit ObservedAspect bean (AspectJ weaving
alone is not sufficient, despite Micrometer Tracing being active), and OTEL_EXPORTER_OTLP_ENDPOINT
already worked on Boot 4.0 via Micrometer's own OtlpConfig fallback -- what's actually new in 4.1
is the rest of the standard OTEL_* surface (verified with OTEL_METRIC_EXPORT_INTERVAL against
identical source compiled on both Boot 4.0.8 and 4.1.1).

Also fixes the root README's module table, which was missing a row for
resilience4j-circuit-breaker (added in a previous commit but never indexed here).

2026-09-18 09:32:34 +00:00

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 services:
   lgtm:
     image: grafana/otel-lgtm:latest
     ports:
       - "3000:3000"   # Grafana UI
       - "4317:4317"   # OTLP gRPC ingest
       - "4318:4318"   # OTLP HTTP ingest
       - "9090:9090"   # Prometheus-compatible query API (bundled Prometheus)
       - "3200:3200"   # Tempo query API (traces)