[NO-TICKET] RFC: Bindings for libdatadog ddsketch API #4858
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On a second pass, this does seem like it makes sense to live inside core.
We were introducing a bit too much copy/pasta for each part of core that depends on libdatadog_api, so I've consolidated them. This opens the door to easily adding ddsketch without more repetition.
We'll use this for integration-style testing with the libdatadog ddsketch implementation. This file was imported from https://raw.githubusercontent.com/DataDog/sketches-go/cd8144afd502b4ee58d5f6c2efe49c4bcf56270b/ddsketch/pb/ddsketch.proto without any changes.
This depends on the fixes in DataDog/libdatadog#1185 .
ericfirth
approved these changes
Aug 20, 2025
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What does this PR do?
This PR introduces a
Datadog::Core::DDSketchAPI that is implemented by libdatadog via the recently added ddsketch ffi ( DataDog/libdatadog#1135 ).For more details on ddsketch, see https://www.datadoghq.com/blog/engineering/computing-accurate-percentiles-with-ddsketch/ .
I'm opening this PR as an RFC/draft for two reasons:
Motivation:
Some upcoming APM features are going to require ddsketch support on the library (the agent has been using it for a long time).
Change log entry
None.
Additional Notes:
N/A
How to test the change?
You'll need libdatadog master to run this branch. Other than that, I've included test coverage for this API, including a encode/decode round trip.