What is observability?

Question

Accepted Answer

**Observability** — system observability.

**Three pillars:**
1. **Metrics** — numerical data (Prometheus).
2. **Logs** — text logs (ELK, Loki).
3. **Traces** — distributed traces (Jaeger, Zipkin).

```yaml
# OpenTelemetry Collector
apiVersion: v1
kind: ConfigMap
metadata:
  name: otel-collector-config
data:
  config.yaml: |
    receivers:
      otlp:
        protocols:
          grpc:
            endpoint: 0.0.0.0:4317
    exporters:
      prometheus:
        endpoint: 0.0.0.0:8889
      jaeger:
        endpoint: jaeger:14250
    service:
      pipelines:
        metrics:
          receivers: [otlp]
          exporters: [prometheus]
        traces:
          receivers: [otlp]
          exporters: [jaeger]
```

**Tools:**
- Prometheus + Grafana (metrics).
- ELK/Loki (logs).
- Jaeger/Zipkin (traces).
- OpenTelemetry (universal).

DevOps: What is observability?