Marcel 45a992f5a8 fix(obs): fix OTLP transport port and add application metrics tag ...

- Change OTEL default endpoint from port 4317 (gRPC) to 4318 (HTTP) to
  match Spring Boot's HttpExporter; sending HTTP/1.1 to a gRPC listener
  caused "Connection reset" errors
- Add otel.logs.exporter=none: Promtail captures Docker logs via the
  logging driver; sending logs to Tempo's OTLP endpoint (which only
  handles traces) produced 404 errors
- Add management.metrics.tags.application to every metric so Grafana's
  Spring Boot Observability dashboard (ID 17175) can filter by the
  application label_values() template variable
- Add MANAGEMENT_METRICS_TAGS_APPLICATION and OTEL_LOGS_EXPORTER env
  vars to docker-compose.prod.yml; production Tempo endpoint already
  uses 4318
- Add MANAGEMENT_TRACING_SAMPLING_PROBABILITY to prod compose with
  0.1 default to avoid 100% trace sampling in production

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-05-16 15:46:45 +02:00

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