Increase metric name maximum length from 63 to 255 characters (open-t…

…elemetry#3648)
carlosalberto · Aug 10, 2023 · a9bb41a · a9bb41a
1 parent 793170d
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -13,6 +13,9 @@ release.
 
 ### Metrics
 
+- Increase metric name maximum length from 63 to 255 characters.
+  ([#3648](https://github.com/open-telemetry/opentelemetry-specification/pull/3648))
+
 ### Logs
 
 ### Resource

diff --git a/specification/metrics/api.md b/specification/metrics/api.md
@@ -202,7 +202,7 @@ The instrument name syntax is defined below using the [Augmented Backus-Naur
 Form](https://tools.ietf.org/html/rfc5234):
 
 ```abnf
-instrument-name = ALPHA 0*62 ("_" / "." / "-" / ALPHA / DIGIT)
+instrument-name = ALPHA 0*254 ("_" / "." / "-" / ALPHA / DIGIT)
 
 ALPHA = %x41-5A / %x61-7A; A-Z / a-z
 DIGIT = %x30-39 ; 0-9
@@ -213,7 +213,7 @@ DIGIT = %x30-39 ; 0-9
 * The first character must be an alphabetic character.
 * Subsequent characters must belong to the alphanumeric characters, '_', '.',
   and '-'.
-* They can have a maximum length of 63 characters.
+* They can have a maximum length of 255 characters.
 
 #### Instrument unit