4.1 Series Release Notes¶

4.1.2¶

Metricd exposes a new option called greedy (true by default) that allows to control whether eager processing of new measures is enabled when available.

Aggregates API output introduced in 4.1.0 doesn’t allow for easy identification of which timeseries is associated with what metrics/resources that have been queried. This have been fixed, but the new output format is not backwards compatible with the format released in 4.1.0.

New API endpoint allows to retrieve, transform, aggregates measurements on the fly in an flexible way. The endpoint location is /v1/aggregates. This endpoint allows to describe operations to be done on a metrics list. Example: (* 5 (rolling mean 3 (aggregate sum (metric (metric1 mean) (metric2 mean))))). The metrics list can be retrieved by searching in resources by setting ‘resource_type’ and ‘search’. More details are available in the documentation.

Aggregates API and cross metrics aggregation API can take dropna for the fill parameter. This acts like null, but NaN values are removed from the result.

The gnocchi-api script is now a wrapper around uWSGI. Using a WSGI-compliant HTTP server always have been recommended, but since most users want to just run gnocchi-api, it’ll now be fast and efficient by default.

All listing endpoints (/v1/metric, /v1/resource/<type>, /v1/search/resource, …) now returns a Link header as described by the RFC5988. For now, only the next page link is provided.

New aggregation methods are available for archive policy; rate:mean, rate:last, …. These new methods allow to compute the timeseries rate of change before applying the selected aggregation method.

The storage.aggregation_workers_number parameter has been replaced by a more general parallel_operations option. It controls the number of parallel jobs that can be run by a worker using threads in various code paths.

When specifying needed_overlap while aggregating across metrics without bounds, the result did not necessarily honour the required overlap provided. Aggregation without bounds now requires 100% overlap; an error is raised otherwise