feat(instrumentation/asgi): add target to metrics (open-telemetry#1323)

Author: sk-

CHANGELOG.md

@@ -18,6 +18,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   ([#1369](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/1369))
 - `opentelemetry-instrumentation-system-metrics` add supports to collect system thread count. ([#1339](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/1339))
 - `opentelemetry-exporter-richconsole` Fixing RichConsoleExpoter to allow multiple traces, fixing duplicate spans and include resources ([#1336](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/1336))
+- `opentelemetry-instrumentation-asgi` metrics record target attribute (FastAPI only)
+  ([#1323](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/1323))
 
 ## [1.13.0-0.34b0](https://github.com/open-telemetry/opentelemetry-python/releases/tag/v1.13.0-0.34b0) - 2022-09-26