L-osservabbilità hija l-abbilità li tifhem l-istat intern ta' sistema mill-outputs esterni tagħha — permezz ta' logs, metrics, u traces. Hija essenzjali għall-operazzjoni, debug, u manteniment tas-sistemi (speċjalment dawk distribwiti), fejn ma tistax timmaniġġja x'ma tistax taraw.
It-tliet pilastri tal-osservabbilità
LOGS → timestamped records of events (what happened) → detailed, for debugging specific issues
METRICS → numerical measurements over time (CPU, latency, request rate, error rate) →
aggregate health/performance; dashboards; alerting
TRACES → follow a request's path through the system (across services) → understand flows,
find bottlenecks/failures in DISTRIBUTED systems (which service was slow?)
→ together: understand WHAT happened, the OVERALL state, and the PATH of requests.
