fix: grpc server ValueError when using unix sockets (#3394)

* fix: grpc server ValueError when using unix sockets

with some grpc implementations the full .peer address is available
for unix sockets, which includes the socket path. it seems that
in versions of grpc prior to 1.53.0, the full path is returned by
`context.peer()`. rather than change the dependency of the instrumentation,
this updates it to more gracefully handle the case of the socket path
being present or absent.

Fixes #3393

* add changelog entry

---------

Co-authored-by: Riccardo Magliocchetti <[email protected]>

Author: diurnalist

Diff for: CHANGELOG.md

@@ -25,6 +25,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - `opentelemetry-instrumentation-dbapi`, `opentelemetry-instrumentation-django`,
   `opentelemetry-instrumentation-sqlalchemy`: Fix sqlcomment for non string query and composable object.
   ([#3113](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/3113))
+- `opentelemetry-instrumentation-grpc` Fix error when using gprc versions <= 1.50.0 with unix sockets.
+  ([[#3393](https://github.com/open-telemetry/opentelemetry-python-contrib/issues/3393)])
 
 ## Version 1.31.0/0.52b0 (2025-03-12)
 

Diff for: instrumentation/opentelemetry-instrumentation-grpc/src/opentelemetry/instrumentation/grpc/_server.py

@@ -239,7 +239,7 @@ def _start_span(
         # * ipv4:127.0.0.1:57284
         # * ipv4:10.2.1.1:57284,127.0.0.1:57284
         #
-        if context.peer() != "unix:":
+        if not context.peer().startswith("unix:"):
             try:
                 ip, port = (
                     context.peer()