Watcher
OpenStack Watcher is an open source resource optimization service for OpenStack clouds that provides model-driven infrastructure monitoring, analysis, and actionable optimization plans.
- Optimization service for OpenStack infrastructure resources (infrastructure optimization)
- Continuous data collection and monitoring of cloud resources and workloads (observability)
- Analysis and scoring of infrastructure efficiency using pluggable strategies (capacity and efficiency management)
- Generation of optimization action plans, including workload rebalancing and power management (orchestration and automation)
- Extensible framework with strategies, audits, and actions integrated with other OpenStack services (cloud management)
More About Watcher
OpenStack Watcher is the optimization service within the OpenStack ecosystem that targets energy, performance, and resource utilization efficiency across cloud infrastructures. It focuses on identifying suboptimal usage patterns in compute, storage, and networking resources and then proposing or executing actions to improve efficiency according to operator-defined goals and strategies.
Watcher operates as a closed-loop optimization framework (infrastructure optimization) that collects metrics and state from underlying OpenStack services and monitoring systems, evaluates this data against configured optimization strategies, and produces action plans. These strategies can address scenarios such as consolidating workloads to reduce power consumption, balancing resource usage across hosts, or aligning placement with performance or policy constraints.
The service is built around several core concepts: goals, strategies, audits, audit templates, action plans, and actions. Goals describe high-level optimization objectives, such as energy or resource optimization. Strategies (policy and decision logic) implement algorithms to achieve those goals, using the current infrastructure state as input. Audits and audit templates define when and how strategies are applied to a given scope of resources. Action plans are the computed sequences of operations that Watcher recommends, and actions are the individual operations that can be executed, for example by interacting with compute or orchestration services.
In enterprise environments, Watcher is used as part of OpenStack-based private or public clouds to improve infrastructure efficiency and support capacity planning. Cloud operators can run audits periodically or on demand to assess current utilization and obtain optimization plans. Depending on configuration, these plans can either be executed automatically or reviewed and applied manually, enabling different operational models and governance practices.
Watcher integrates with core OpenStack components (cloud management) through well-defined APIs and plugins. It relies on OpenStack services for inventory and control of resources and can consume metrics from telemetry or monitoring backends. Its modular architecture allows operators and integrators to develop custom strategies, goals, and actions tailored to domain-specific constraints, regulatory requirements, or internal policies.
From a technical categorization perspective, Watcher falls into infrastructure optimization and cloud operations automation for OpenStack environments. It provides a programmable framework for energy and capacity optimization, workload consolidation, and policy-aware placement, and it exposes Representational State Transfer (REST) APIs that enable integration with higher-level management tools, dashboards, or automation pipelines used in enterprise IT operations.