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2.9. Telemetry

This section outlines the top new features and changes for the Telemetry service.
To provide better performance and scalability, the ceilometer API has been replaced by gnocchi and aodh, and is now considered deprecated. The ceilometer events API and its code have been moved to a new component called panko.
The nova instance discovery, that was based on polling nova API, was very resource consuming. Newly, it has been optimized to rely on libvirt, which significantly improves the performance.
Gnocchi provides a new collectd plugin that stores metrics generated by collectd.
Panko is a new component that replaces the ceilometer events and its API.