Clarify differences between prometheus protocols, including target in…

…fo metric naming (open-telemetry#3871) Fixes open-telemetry#3700 ## Changes The current specification mixes OpenMetrics and Prometheus in ways that can be confusing. This change first explains the differences between various Prometheus formats, and then consistently uses "Prometheus" to refer to the general conversion rules. This is helpful for explaining why the target (info) metric naming differs depending on the format used. Also, fix references to the "target" info-typed metric, which was previously referred to as "target_info". "target_info" is only used when info-typed metrics are not supported. --------- Co-authored-by: Yuri Shkuro <[email protected]> Co-authored-by: Eero Tamminen <[email protected]> Co-authored-by: Robert Pająk <[email protected]> Co-authored-by: Anthony Mirabella <[email protected]> Co-authored-by: Josh Suereth <[email protected]>
carlosalberto · Mar 14, 2024 · 623579c · 623579c
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -23,6 +23,9 @@ release.
 
 ### Compatibility
 
+- Prometheus compatibility: Clarify naming of the target info metric, and differences between various Prometheus formats.
+  ([#3871](https://github.com/open-telemetry/opentelemetry-specification/pull/3871))
+
 ### SDK Configuration
 
 ### Common