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OpenStack Ceilometer

OpenStack Ceilometer is the OpenStack telemetry (observability and metering) service that collects, normalizes, and exposes usage and performance data from an OpenStack cloud for billing, monitoring, and analytics.

  • Telemetry collection framework for OpenStack services (observability)
  • Resource and usage metering for compute, storage, and networking components (usage metering)
  • Normalization and publication of metrics and events to external data stores and processing pipelines (data integration)
  • Support for rating and billing workflows based on collected cloud usage data (cost management)
  • Extensible architecture for adding new meters, event sources, and dispatch targets (platform extensibility)

More About OpenStack Ceilometer

OpenStack Ceilometer is the telemetry component of OpenStack (cloud infrastructure platform), designed to collect, aggregate, and expose metrics and event data from an OpenStack cloud. It addresses the problem of obtaining consistent, queryable information about resource consumption and operational status across distributed OpenStack services, which is necessary for billing, capacity planning, monitoring, and audit use cases.

Ceilometer focuses on two main domains: (metering and usage accounting) and (events and notifications). In the metering domain (usage metering), Ceilometer gathers measurements such as Central Processing Unit (CPU) utilization, instance uptime, storage volumes usage, and network traffic for resources managed by services like Nova (compute), Cinder (block storage), Neutron (networking), and others. In the events domain (event telemetry), Ceilometer consumes notifications emitted by OpenStack services over the message bus, turning them into structured events that can be stored, queried, and forwarded to other components.

The project uses a pluggable collection and dispatch model (telemetry framework). Data can be collected through multiple mechanisms, including polling OpenStack APIs and listening to notifications on the messaging system used by an OpenStack deployment. Collected samples and events are then dispatched to one or more back-end systems, such as time-series databases or message queues, depending on operator configuration. This design allows operators to integrate Ceilometer with external monitoring, analytics, and billing platforms without tightly coupling those tools to individual OpenStack services.

In enterprise environments, Ceilometer is commonly deployed as part of a broader OpenStack telemetry stack (cloud observability), working with components such as Aodh for alarming and Gnocchi or other data stores for metrics persistence and retrieval, as described in OpenStack documentation. Enterprises use Ceilometer data to support chargeback and showback models, usage-based reporting, Service Level Agreement (SLA) monitoring, and trend analysis. Because it draws on standardized notifications and APIs across OpenStack services, Ceilometer provides a single telemetry entry point instead of multiple service-specific integrations.

From an architectural perspective, Ceilometer consists of agents and central services (distributed telemetry collection). Agents run on compute nodes or centrally to poll metrics and consume notifications, while the central services manage data processing and dispatch. The project integrates with the OpenStack identity service for authentication (identity and access management) and uses the OpenStack message bus and configuration frameworks for coordination. Its plugin-based meter definitions and publishers enable operators and integrators to extend telemetry coverage and route data into different observability stacks, financial systems, or custom applications.

Within an enterprise technology directory, OpenStack Ceilometer fits under cloud infrastructure observability, telemetry, and usage metering for OpenStack-based private and public clouds, with roles in billing support, monitoring data collection, and integration into external analytics pipelines.