Prometheus 3 Native Histogram and OpenTelemetry Exponential Histogram #7356
Description
What type of enhancement is this?
API improvement
What does the enhancement do?
Prometheus Native Histogram
Native histogram becomes a stable feature of Prometheus since 3.8
General structure
Similar to a classic histogram, a native histogram has a field for the count of observations and a field for the sum of observations. While the count of observation is generally non-negative (with the only exception being intermediate results in PromQL), the sum of observations might have any float64 value.
In addition, a native histogram contains the following components, which are described in detail in dedicated sections below:
- A schema to identify the method of determining the boundaries of any given bucket with an index i.
- A sparse representation of indexed buckets, mirrored for positive and negative observations.
- A zero bucket to count observations close to zero.
- A (possibly empty) list of custom values.
Exemplars.
More context: https://prometheus.io/docs/specs/native_histograms/
Not sure if it's required to support Remote Write 2.0 first. #4765
OpenTelemetry Exponential Histogram
OpenTelemetry Exponential Histogram is the OpenTelemetry equivalent to Prometheus Native Histogram. We can use the data structure of Prometheus to support this Otel data type.
https://opentelemetry.io/docs/specs/otel/metrics/data-model/#exponentialhistogram
Implementation challenges
No response