Link to proposal for gRPC metrics (open-telemetry#627)

Co-authored-by: Joao Grassi <5938087+joaopgrassi@users.noreply.github.com>

.chloggen/627.yaml

@@ -0,0 +1,22 @@
+# Use this changelog template to create an entry for release notes.
+#
+# If your change doesn't affect end users you should instead start
+# your pull request title with [chore] or use the "Skip Changelog" label.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: enhancement
+
+# The name of the area of concern in the attributes-registry, (e.g. http, cloud, db)
+component: rpc
+
+# A brief description of the change. Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Add link to specification for metrics defined by gRPC community.
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+# The values here must be integers.
+issues: [627]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:

docs/rpc/README.md

@@ -23,4 +23,8 @@ Technology specific semantic conventions are defined for the following RPC syste
 * [gRPC](grpc.md): Semantic Conventions for *gRPC*.
 * [JSON-RPC](json-rpc.md): Semantic Conventions for *JSON-RPC*.
 
+Specifications defined by maintainers of RPC systems:
+
+* [gRPC](https://github.com/grpc/proposal/blob/master/A66-otel-stats.md): Semantic Conventions for *gRPC*.
+
 [DocumentStatus]: https://github.com/open-telemetry/opentelemetry-specification/tree/v1.26.0/specification/document-status.md

docs/rpc/rpc-metrics.md

@@ -288,5 +288,9 @@ More specific Semantic Conventions are defined for the following RPC technologie
 * [gRPC](grpc.md): Semantic Conventions for *gRPC*.
 * [JSON-RPC](json-rpc.md): Semantic Conventions for *JSON-RPC*.
 
+Specifications defined by maintainers of RPC systems:
+
+* [gRPC](https://github.com/grpc/proposal/blob/master/A66-otel-stats.md): Semantic Conventions for *gRPC*.
+
 [DocumentStatus]: https://github.com/open-telemetry/opentelemetry-specification/tree/v1.26.0/specification/document-status.md
 [MetricRecommended]: /docs/general/metric-requirement-level.md#recommended