1573441 - Create a `CustomDistributionMetricType` in glean-core

Status: RESOLVED FIXED

(Data Platform and Tools :: Glean: SDK, task, P1)

Description

[Jan-Erik Rediger [:janerik]]

Some GeckoView histograms require a fairly custom shape of the distribution, which doesn't directly fit into the concept of "infinite binning". Additionally, some distributions do not have units or have custom units (e.g. "pixels" or "% of vsync").

We should introduce a new metric type, only usable for mapping to Gecko histograms, which allows for specifying:

• either linear or exponential bucketing;
• min/max range;
• time_unit (only in the metrics.yaml, for metadata)
• number of buckets.

Glean AC PR: https://github.com/mozilla-mobile/android-components/pull/4041

Comment 2

[Jan-Erik Rediger [:janerik]]

I got a half-finished Rust implementation up here: https://github.com/mozilla/glean/compare/custom-distribution
Lacks everything except the basic implementation (and I had to duplicate few things to easily support linear and exponential histograms).

Will continue work on it when I return.

Comment 3

[Jan-Erik Rediger [:janerik]]

Attachment: GitHub Pull Request