fix(major::pr): re-architect instrumentation library

llama_stack/providers/registry/instrumentation.py

@@ -0,0 +1,41 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# the root directory of this source tree.
+
+"""Registry for instrumentation providers (non-API providers).
+
+This registry is string-based to avoid importing provider modules at import
+ time (prevents circular imports). Classes are instantiated lazily by the
+ StackRunConfig validator using `instantiate_class_type`.
+
+Please implement your instrumentation provider as a subclass of `InstrumentationProvider` and register it in this registry.
+
+Example:
+
+```
+from llama_stack.core.instrumentation import InstrumentationProvider
+
+class MyInstrumentationProvider(InstrumentationProvider):
+    fastapi_middleware(self, app: FastAPI) -> None:
+        pass
+```
+"""
+
+from typing import NamedTuple
+
+
+class InstrumentationEntry(NamedTuple):
+    provider_class: str  # fully-qualified class path
+    config_class: str  # fully-qualified class path
+    description: str
+
+
+instrumentation_registry: dict[str, InstrumentationEntry] = {
+    "otel": InstrumentationEntry(
+        provider_class="llama_stack.providers.inline.instrumentation.otel.otel.OTelInstrumentationProvider",
+        config_class="llama_stack.providers.inline.instrumentation.otel.config.OTelConfig",
+        description="OpenTelemetry instrumentation",
+    ),
+}