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devops(backend): expose Prometheus metrics endpoint + OTLP trace export from Spring Boot #588

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marcel merged 3 commits from feat/issue-576-backend-instrumentation into main 2026-05-15 03:57:15 +02:00
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@@ -107,6 +107,8 @@ All vars are set in `.env` at the repo root (copy from `.env.example`). The back
| `MAIL_SMTP_AUTH` | SMTP auth enabled | `false` (dev) | YES (prod) | — |
| `MAIL_STARTTLS_ENABLE` | STARTTLS enabled | `false` (dev) | YES (prod) | — |
| `SPRING_PROFILES_ACTIVE` | Spring profile | `dev,e2e` (compose) | YES | — |
| `OTEL_EXPORTER_OTLP_ENDPOINT` | OTLP gRPC endpoint for distributed traces (Tempo). Set to `http://tempo:4317` via compose. | `http://localhost:4317` | — | — |
| `MANAGEMENT_TRACING_SAMPLING_PROBABILITY` | Micrometer tracing sample rate; overridden to `0.0` in test profile. | `0.1` (compose) / `1.0` (dev) | — | — |
### PostgreSQL container