# Observability

## Logging

| Aspect | Implementation |
|--------|---------------|
| Framework | Serilog 4.1.0 |
| Sinks | Console, Rolling File (`logs/log.txt`, daily) |
| Minimum Level | Information |
| Enrichment | `FromLogContext` |

### Log Sources

| Source | Level | Content |
|--------|-------|---------|
| BusinessExceptionHandler | WARN | Business exceptions with message |
| ResourcesService | INFO | Successful file saves |
| DbFactory (linq2db trace) | INFO | SQL query text (via `Console.WriteLine`) |

## Metrics

No metrics collection configured (no Prometheus, Application Insights, or similar).

## Health Checks

No health check endpoint configured.

## Tracing

No distributed tracing configured.

## Observations

- Logging is minimal — no structured request/response logging.
- No health check endpoint for container orchestration or load balancer probes.
- SQL trace goes directly to `Console.WriteLine`, not through Serilog.
- No log correlation (request IDs, trace IDs).
- No alerting or monitoring infrastructure.