Observability

It is the ability to understand and analyze what is happening inside a system based on the information available externally

Enables system operators to gain insights into how a system is functioning
Observability is not monitoring
Uses data from; logs, metrics, traces, and events.
Logs – application logs and system logs.
Logs – provide insights into system behavior to identify errors and issues
Metrics – tracks specifics aspects of the system’s performance or behavior over time
Metrics – CPU, memory, response time, error rates, health status, etc.
Traces – captures the end-to-end flow of requests through a distributed system
Traces – uses timestamps at different points
Traces – helps to identify bottlenecks and performance issues
Observability should be in every architectural design