redis otel tracing + async support for latency routing (#6452)

* docs(exception_mapping.md): add missing exception types

Fixes https://github.com/Aider-AI/aider/issues/2120#issuecomment-2438971183

* fix(main.py): register custom model pricing with specific key

Ensure custom model pricing is registered to the specific model+provider key combination

* test: make testing more robust for custom pricing

* fix(redis_cache.py): instrument otel logging for sync redis calls

ensures complete coverage for all redis cache calls

* refactor: pass parent_otel_span for redis caching calls in router

allows for more observability into what calls are causing latency issues

* test: update tests with new params

* refactor: ensure e2e otel tracing for router

* refactor(router.py): add more otel tracing acrosss router

catch all latency issues for router requests

* fix: fix linting error

* fix(router.py): fix linting error

* fix: fix test

* test: fix tests

* fix(dual_cache.py): pass ttl to redis cache

* fix: fix param

litellm/_service_logger.py

@@ -44,8 +44,7 @@ class ServiceLogging(CustomLogger):
         """
         Handles both sync and async monitoring by checking for existing event loop.
         """
-        # if service == ServiceTypes.REDIS:
-        #     print(f"SYNC service: {service}, call_type: {call_type}")
+
         if self.mock_testing:
             self.mock_testing_sync_success_hook += 1
 
@@ -112,8 +111,7 @@ class ServiceLogging(CustomLogger):
         """
         - For counting if the redis, postgres call is successful
         """
-        # if service == ServiceTypes.REDIS:
-        #     print(f"service: {service}, call_type: {call_type}")
+
         if self.mock_testing:
             self.mock_testing_async_success_hook += 1