Expose ExemplarReservoir as configuration option of View. (#3820)

Fixes #2922 Fixes #3812 Related to #3756 ## Changes - Cleans up language around exposing `ExemplarReservoir`. (Remove TODO, e.g.) - Remove `ExemplarFilter` interface but keep configuration options. (see #3812) - Clarify / simplify Spec Compliance matrix for existing state of the Exemplar Specification. Prototype in java: open-telemetry/opentelemetry-java#5960
open-telemetry · Jan 31, 2024 · c0491fb · c0491fb
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -13,6 +13,11 @@ release.
 
 ### Metrics
 
+- Expose `ExemplarReservoir` as configuration parameter for views.
+  Remove `ExemplarFilter` as an interface, now it is only configuration
+  parameter.
+  ([#3820](https://github.com/open-telemetry/opentelemetry-specification/pull/3820))
+
 ### Logs
 
 - Fix `Resource` field type in Logs Data Model.