Observability

Definitions

1. Observability is the ability to understand a system's internal state by examining its external outputs, primarily through three pillars: logs (event records), metrics (numerical measurements over time), and traces (request paths across services). While monitoring tells you something is broken, observability helps you diagnose why. Observable systems emit enough structured telemetry that engineers can ask arbitrary questions about behavior without deploying new instrumentation. OpenTelemetry has emerged as the vendor-neutral standard for collecting telemetry, while platforms like Datadog, Grafana, and Honeycomb provide storage, visualization, and alerting. Observability is critical in distributed microservice architectures where a single request may traverse dozens of services.

   In plain English: The ability to see what's happening inside a running system from the outside — like having X-ray vision for your servers.

Related Terms

• SIEM
• SLA
• Unit Test
• Integration Test
• DevOps
• SRE
• distributed tracing
• flame graph
• A/B testing
• Metrics Collection
• Performance Budget
• Pulse
• Resource Leak
• Risk Assessment Dev
• Stepper
• Time Series