# Observability
| | **Observability** is a measure of how well internal states of a system can be inferred from knowledge of its external outputs. |
| ---- | ---- |
| | wikipedia:: [Observability](https://en.wikipedia.org/wiki/Observability) |
| | url:: [What is Observability? \| IBM](https://www.ibm.com/cloud/learn/observability) |
> [!summary]- Wikipedia Synopsis
> **Observability** is a measure of how well internal states of a system can be inferred from knowledge of its external outputs.
>
> In control theory, the observability and controllability of a linear system are mathematical duals.
>
> The concept of observability was introduced by the Hungarian-American engineer Rudolf E. Kálmán for linear dynamic systems. A dynamical system designed to estimate the state of a system from measurements of the outputs is called a state observer or simply an observer for that system.
[What is Observability? A Beginner's Guide | Splunk](https://www.splunk.com/en_us/data-insider/what-is-observability.html)
> for an organization's infrastructure, this means instrumenting all compute
> resources, apps, and services with
> "sensors" that faithfully report metrics from
> those components. It also means making those metrics available on a central,
> easily accessible platform, where observers can bring them together to reconstruct
> a full picture of the system's status and operation.
> Observability dovetails with the devops movement, as it represents a cultural
> shift away from siloed, piecemeal views into critical systems toward a detailed,
> comprehensive view of the infrastructure that is shared across the organization.
## Sources
- [DevOps Observability from Code to Cloud - The New Stack](https://thenewstack.io/devops-observability-from-code-to-cloud/)
- [Observability Products & Solutions | Splunk](https://www.splunk.com/en_us/products/observability.html?301=/en_us/devops.html)
- [Observability Matters. But Are You Observing the Right Things? - DevOps.com](https://devops.com/observability-matters-but-are-you-observing-the-right-things/)
- [Observability vs Monitoring: A DevOps perspective](https://israelo.io/blog/observability-vs-monitoring/)
- [New DevOps Engineer looking for advice for monitoring and alerting : r/kubernetes](https://www.reddit.com/r/kubernetes/comments/rr24md/new_devops_engineer_looking_for_advice_for/)