Observabele

Observabele is a term used in some contexts to denote an object, data source, or data stream whose external behavior can be observed and measured. An observabele is typically described by a state space S, an observation function obs: S -> O mapping states to observable outputs, and a transition relation that describes how the state changes over time in response to inputs or events. The sequence of outputs produced by obs over time constitutes the observable behavior, which observers use to infer properties of the system. Observability is the related property that determines whether the internal state can be uniquely determined from the observable outputs.

In software engineering and data science, observabele often refers to a source that can be monitored by external components. In reactive or event-driven architectures, an observabele is a data stream or event source to which observers can subscribe to receive values. In formal modeling, an observabele can be modeled as a labeled transition system, a Moore or Mealy machine, or as a stream of observations in a temporal logic framework.

Applications include system monitoring, debugging, telemetry, and distributed tracing, where the ability to observe outputs without inspecting internal state is essential. Distinguishing from related terms: observers observe an observabele; the term obsservable might be used synonymously with observable in some texts, while observability refers to the ability to deduce state from outputs.

See also: observability, observable, reactive programming, telemetry, logging.