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In control theory, visible state of a system
In control theory, the observability and controllability of a linear system are mathematical duals. The concept of observability was introduced by the
Observability
Ability to collect data about software execution
of observability varies by vendor: Observability is the process of making a system’s internal state more transparent. Systems are made observable by the
Observability_(software)
Any entity that can be measured
In physics, an observable is a physical property or physical quantity that can be measured. In classical mechanics, an observable is a real-valued "function"
Observable
following section we are going to take a closer look at the Observability Gramian. The Observability Gramian can be found as the solution of the Lyapunov equation
Observability_Gramian
control theory, observability is a measure of how well the internal state of a system can be inferred from its external outputs. AI observability is often distinguished
AI_observability
All of space observable from the Earth at the present
would be about 9.2 Gpc, or about 30 billion light-years. The limit of observability in the universe is set by cosmological horizons which limit—based on
Observable_universe
American technology company
monitoring, application security, digital experience, business observability, AI observability, and cloud automation. OneAgent: Automated data collection
Dynatrace
American technology company
Datadog, Inc. is an American company that provides an observability service for cloud-scale applications, providing monitoring of servers, databases,
Datadog
Open-source analytics and visualization platform
Labs. Retrieved July 1, 2026. "Grafana Labs Previews Future of Observability at ObservabilityCON 2021" (Press release). Grafana Labs. November 9, 2021. Retrieved
Grafana
Open-source database management system
observability platform built on ClickHouse, providing a user interface and observability tooling that were integrated into ClickHouse's observability
ClickHouse
American artificial intelligence software company
artificial intelligence software company that develops evaluation and observability tools for large language model (LLM) applications and AI systems. The
Braintrust
American software company
"Software observability platform Honeycomb raises $50M". VentureBeat. Retrieved 10 October 2023. Gillin, Paul (6 April 2023). "Observability platform Honeycomb
Honeycomb_(company)
In mathematics, in the representation theory of algebraic groups, an observable subgroup is an algebraic subgroup of a linear algebraic group whose every
Observable_subgroup
Open source cloud computing software
Hubble was created as the network observability component and Tetragon was later added for security observability and runtime enforcement. Cilium runs
Cilium_(computing)
Former cloud computing service offered by Google
Operations Suite. By 2025, Google had began using the name Google Cloud Observability. Morgan, Timothy Prickett (2 May 2013). "Stackdriver fluffs up cloudy
Stackdriver
Military technology to make personnel and material less visible
United States and its Asian allies. Stealth technology (or LO for low observability) is not one technology. It is a set of technologies, used in combinations
Stealth_technology
American software company
Funding, Expands Data Observability Pipeline Lineup | CRN". www.crn.com. Retrieved 2024-06-19. "Cribl sets out to fix IT observability lock-in with $35M from
Cribl.io
Real-time observability platform
Netdata is a real-time observability platform for monitoring infrastructure and applications. The project started in 2016 as an open-source system monitoring
Netdata
Generalization of a Markov decision process
overfitting and asymptotic bias in batch reinforcement learning with partial observability. Journal of Artificial Intelligence Research. Vol. 65. pp. 1–30. arXiv:1709
Partially observable Markov decision process
Partially_observable_Markov_decision_process
Exposure level measure used in drug studies
The no-observed-adverse-effect level (NOAEL) denotes the level of exposure of an organism, found by experiment or observation, at which there is no biologically
No-observed-adverse-effect level
No-observed-adverse-effect_level
Concept in statistics
can only be inferred indirectly through a mathematical model from other observable variables that can be directly observed or measured. Such latent variable
Latent and observable variables
Latent_and_observable_variables
partially observable system is one in which the entire state of the system is not fully visible to an external sensor. In a partially observable system the
Partially_observable_system
System with an infinite-dimensional state-space
important ones are: Exact observability (also known as continuous observability), Approximate observability, Final state observability. An important role is
Distributed_parameter_system
Concept in quantum mechanics
In quantum mechanics, a complete set of commuting observables (CSCO) is a set of commuting operators whose common eigenvectors can be used as a basis
Complete set of commuting observables
Complete_set_of_commuting_observables
Mathematical model of a system in control engineering
variables. Observability is a measure for how well internal states of a system can be inferred by knowledge of its external outputs. The observability and controllability
State-space_representation
Israeli ML observability platform
Aporia is a machine learning observability platform based in Tel Aviv, Israel. The company has a US office located in San Jose, California. Aporia has
Aporia_(company)
Cloud-based data-warehousing company
bring-your-own-cloud (BYOC) deployments and provides enterprise governance, observability, and security features. Snowflake supports workloads such as machine
Snowflake_Inc.
American technology company
respond to issues in real time. With a focus on cyber security and observability, Splunk describes its on-premises software and SaaS products as SIEM
Splunk
Branch of artificial intelligence
probabilities, full observability, maximization of a reward function, and a single agent. When full observability is replaced by partial observability, planning
Automated planning and scheduling
Automated_planning_and_scheduling
Totality of psychological phenomena
conduct, understanding mental phenomena as dispositions to engage in observable behavior. The mind–body problem is the challenge of explaining the relation
Mind
American information technology company
consistent software architecture, automation framework, telemetry, observability, and operational model across data center, campus, WAN, and cloud deployments
Arista_Networks
Country in Southeastern Europe and West Asia
persistence of these former inhabitants' genes among the modern Uyghurs is both observable and scientifically demonstrable.32 Early Chinese sources describe the
Turkey
In high energy physics, event shapes observables are quantities used to characterize the geometry of the outcome of a collision between high energy particles
Event_shape_observables
Construct in the philosophy of science
metaphysics. A Ramsey sentence aims at rendering propositions containing non-observable theoretical terms (terms employed by a theoretical language) clear by
Ramsey_sentence
Aspect of relativity in physics
systems by rephrasing the gravitational waves in terms of the manifestly observable Riemann curvature tensor. At the time, Pirani's work was overshadowed
Gravitational_wave
American Internet measurement company
Kentik is an American network observability, network monitoring and anomaly detection company headquartered in San Francisco, California. Kentik was founded
Kentik
Country in northwestern Europe
in the Anglosphere and the Commonwealth; its soft power influence is observable in the legal and political systems of many former colonies, and in its
United_Kingdom
Program library
programming languages. ReactiveX is an API for asynchronous programming with observable streams. Asynchronous programming allows programmers to call functions
ReactiveX
Natural satellite orbiting Earth
phases, and when the Moon passes through Earth's shadow a lunar eclipse is observable. The Moon's apparent size in Earth's sky is about the same as that of
Moon
Void between celestial bodies
almost entirely of empty space. Most of the remaining mass-energy in the observable universe is made up of an unknown form, dubbed dark matter and dark energy
Outer_space
Hypothetical invisible cosmic material
context of formation and evolution of galaxies, gravitational lensing, the observable universe's current structure, mass position in galactic collisions, the
Dark_matter
Scale for measuring the brightness of the night sky
night sky's brightness of a particular location. It characterizes the observability of celestial objects, taking into account the interference caused by
Bortle_scale
Monitoring and management of performance and availability of software applications
vendors by the term Observability. Often, monitoring is seen as the technical process of data collection, whereas observability is seen as the capability
Application performance management
Application_performance_management
American technology company
Larry (May 10, 2021). "ServiceNow acquires Lightstep, aims to leverage observability across enterprises". ZDNet. Retrieved July 31, 2026. Dignan, Larry (August
ServiceNow
Description of physical properties at the atomic and subatomic scale
eigenvector of an observable, in which case it is called an eigenstate, and the associated eigenvalue corresponds to the value of the observable in that eigenstate
Quantum_mechanics
American information technology company
company. Its products consist of software and hardware focused on Unified Observability, Network Visibility, End User Experience Management,[clarification needed]
Riverbed_Technology
Second planet from the Sun
Venus is the second planet from the Sun. Similar in size and mass to Earth, Venus has no liquid water, and its atmosphere is far thicker and denser than
Venus
Most populous city in Canada
mouth of Highland Creek, where they form the Scarborough Bluffs. Other observable sections include the area near St. Clair Avenue West between Bathurst
Toronto
Mathematician and physicist
James Alan Yorke (born August 3, 1941) is an American mathematician who is a Distinguished University Research Professor of Mathematics and Physics and
James_A._Yorke
Notation for conserved quantities in physics and chemistry
Quantum numbers are closely related to eigenvalues of observables. When the corresponding observable commutes with the Hamiltonian of the system, the quantum
Quantum_number
Country in South Asia
stone sculptures of conventional figures. Bronze and copper craftsmanship observable in the sculpture of deities and beasts, decorations of doors and windows
Nepal
Cloud infrastructure monitoring platform acquired by Splunk for $1.05 billion in 2019
to enhance Splunk's cloud-native observability and APM capabilities, integrating SignalFx into Splunk’s Observability Suite. The acquisition consisted
SignalFx
Cloud computing model
fallacies: Versioning is simple Compensating transactions always work Observability is optional Monitoring and debugging serverless applications can present
Serverless_computing
Observable event
A phenomenon (pl. phenomena), sometimes spelled phaenomenon, is an observable event. The term came into its modern philosophical usage through Immanuel
Phenomenon
American computer scientist
scientist and data visualization specialist. He is one of the co-creators of Observable and a key developer of D3.js, a JavaScript library used to produce dynamic
Mike_Bostock
Country in Southeast Asia
Li Fangkuei). Ferlus work is based on simple rules of phonetic change observable in the Sinosphere and studied for the most part by William H. Baxter (1992)
Thailand
Knowledge acquired by means of the senses
theories. For this role, evidence must be public and uncontroversial, like observable physical objects or events and unlike private mental states, so that evidence
Empirical_evidence
Entity not directly observable by humans
empirically adequate theory. Van Fraassen characterizes observability counterfactually: "X is observable if there are circumstances which are such that, if
Unobservable
Only experiencing secondary sexual attraction
rarely or never experience sexual attraction solely based on immediately observable characteristics such as appearance or smell, and do not typically experience
Demisexuality
Excessive preoccupation with oneself
narcissism is normal and healthy in humans, there are also more extreme forms, observable particularly in people who have narcissistic personality disorder (NPD)
Narcissism
Island country in the central Pacific
international cooperation and multilateral solutions. This is notably observable during the current negotiations of the Global Plastic Pollution Treaty
Kiribati
English polymath (1642–1727)
true scientific inquiry requires grounding explanations strictly on observable data rather than speculative reasoning. Thus, for Newton, proposing hypotheses
Isaac_Newton
Region of the observable universe
sphere, causal sphere and sphere of causality is a spherical region of the observable universe surrounding an observer beyond which objects recede from that
Hubble_volume
American stealth multirole fighter aircraft
can be shared via MADL to other platforms without compromising low observability, while Link 16 enables communication with older systems. The F-35 was
Lockheed Martin F-35 Lightning II
Lockheed_Martin_F-35_Lightning_II
Progressive neurodegenerative disease
theories exist, as mentioned in the section on causes above. There are also observable differences in the disease course, as tau protein accumulates faster in
Alzheimer's_disease
Iranian religion founded by Zoroaster
the ancient Indo-Iranians. For these, asha was the course of everything observable—the motion of the planets and astral bodies; the progression of the seasons;
Zoroastrianism
Provider of application and network performance management products
NETSCOUT) is an American technology company that specializes in software observability, deep packet inspection, DDoS mitigation and AIOps. Headquartered in
NetScout_Systems
Input where a function output does not matter
In computer science and integrated circuit design, a don't-care term (abbreviated DC, historically also known as redundancies, irrelevancies, optional
Don't-care_term
Idea of connecting all of physics into one set of equations
Unification of theories about observable fundamental phenomena of nature is one of the primary goals of physics. Isaac Newton’s unification of terrestrial
Unification of theories in physics
Unification_of_theories_in_physics
Extent of the observable world seen at any given moment
The field of view (FOV) is the angular extent of the observable world that is seen at any given moment. In the case of optical instruments or sensors,
Field_of_view
Horizon appearing on a cosmological scale
between the observable and the unobservable regions of the universe, so its distance at the present epoch defines the size of the observable universe. When
Cosmological_horizon
Systematic approach to understanding the behavior of humans and other animals
unlike behaviorism, views internal mental states as explanations for observable behavior. Behaviorism emerged in the early 1900s as a reaction to depth
Behaviorism
View in philosophy of science
philosophical view that the universe described by science (including both observable and unobservable aspects) exists independently of perception, and that
Scientific_realism
Runtime system for operating systems
protection and security enforcement Netflix uses eBPF for fleet-wide network observability and performance diagnosis Dropbox uses eBPF through Katran for layer
EBPF
American web tracking and analytics company
The Oregonian. Retrieved May 4, 2022. "New Relic acquires Kubernetes observability platform Pixie Labs". TechCrunch. December 10, 2020. Retrieved August
New_Relic
1994 multi-role combat aircraft family by Eurofighter
carried out tests on the early Eurofighter prototypes to optimise the low observability characteristics of the aircraft from the early 1990s. Testing at Warton
Eurofighter_Typhoon
British software engineer and open-source technologist
Liz leads open-source initiatives, advocating for the use of eBPF for observability, security, and networking in cloud-native environments. She has played
Liz_Rice
Foundational principle in quantum physics
observable A is performed, then the system is in a particular eigenstate Ψ of that observable. However, the particular eigenstate of the observable A
Uncertainty_principle
Formulation of quantum mechanics
(largely due to Werner Heisenberg in 1925) of quantum mechanics in which observables incorporate a dependency on time, but the states are time-independent
Heisenberg_picture
Facts provided or learned about something or someone
abstractions. Any natural process that is not completely random and any observable pattern in any medium can be said to convey some amount of information
Information
Everything in space and time
starting from a dense fireball in an event called the Big Bang. The observable portion of the universe is approximately 93 billion light-years in diameter
Universe
Anglo-French missile programme
Air Force. The Stratus family comprises two missiles, Stratus LO (Low Observable) and Stratus RS (Rapid Strike). In 2017, an agreement for the launch of
Stratus_(missile_family)
Light from the stars
radiation from stars other than the Sun, observable from Earth at night, although a component of starlight is observable from Earth during daytime. Sunlight
Starlight
Branch of engineering and mathematics
point. Other aspects which are also studied are controllability and observability. Control theory is used in control system engineering to design automation
Control_theory
Process by which a quantum system takes on a definitive state
mechanics each measurable physical quantity of a quantum system is called an observable which, for example, could be the position r {\displaystyle r} and the
Wave_function_collapse
Service networking platform
DNS interface or an HTTP interface. Envoy proxy provides security, observability, and resilience for all application traffic. HashiCorp announced on
Consul_(software)
Indications of a specific illness, including psychiatric
illness, injury, or condition. While signs are objective and externally observable, symptoms are a person's reported subjective experiences. A sign, for
Signs_and_symptoms
Sifflet is a French data observability platform based in Paris. Sifflet was founded in 2021 in Paris by Salma Bakouk, Wissem, and Wajdi Fathallah to identify
Sifflet
Range of Indian religious traditions
divine in everything, human beings, animals, trees and rivers. It is observable in offerings to rivers, trees, tools of one's work, animals and birds
Hinduism
Global software company
Opstrace, Inc., developers of an open-source software monitoring and observability platform. In March 2024, GitLab Inc. acquired Oxeye, a provider of cloud-native
GitLab_Inc.
Physical quantity conserved throughout a motion
energy of the system is a constant of motion (a conserved quantity). An observable quantity Q will be a constant of motion if it commutes with the Hamiltonian
Constant_of_motion
Hungarian and American mathematician and physicist (1903–1957)
infinite-dimensional even for a single particle. In this formalism of quantum mechanics, observable quantities such as position or momentum are represented as linear operators
John_von_Neumann
Physics generalization
The generalized uncertainty principle (GUP) is a proposed extension of the Heisenberg uncertainty principle that incorporates potential effects of gravitational
Generalized uncertainty principle
Generalized_uncertainty_principle
Interstellar comet in 2025
continued observing 3I/ATLAS until 20 July 2025, when the comet was no longer observable from Chile while the Sun was below the horizon; the observatory's 3200-megapixel
3I/ATLAS
Mythical creature
any other known great apes, and so proposed explanations for elevated observable eyeshine in the forest include owls, raccoons, or opossums perched in
Bigfoot
American heavy strategic bomber
bombers due to its blend of low-observable technologies with high aerodynamic efficiency and a large payload. Low observability provides greater freedom of
Northrop_B-2_Spirit
Systematic endeavour to gain knowledge
for the success of a scientific theory is whether what it says about observable entities is true. Thomas Kuhn argued that the process of observation and
Science
Linux Foundation project
level on September 29, 2024. Cilium provides networking, security, and observability for Kubernetes deployments using eBPF technology. It joined the CNCF
Cloud Native Computing Foundation
Cloud_Native_Computing_Foundation
Diplomatic crisis over US annexation threats
about imminent Chinese and Russian threats to Greenland as detached from observable reality and emblematic of information manipulation rather than genuine
Greenland_crisis
Military aircraft
attribute of the conceptualised aircraft was the integration of low observability features, which were intended to achieve a balance between reduced detectability
BAE_Systems_Replica
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