(fix) Strip trailing slash in api_base for prometheus metrics

[owaisaamir]

Description by Korbit AI

What change is being made?

Remove trailing slashes from api_base in the prometheus metrics

Why are these changes being made?

Trailing slashes in api_base values can cause increased metric cardinality resulting in higher custom metrics cost in platform such as Datadog. This can also cause metrics not getting aggregated correctly for the same api_base.

example metrics with trailing slash:

litellm_deployment_success_responses_total{api_base="https://api.openai.com/v1/",api_key_alias="None",api_provider="openai",hashed_api_key="None",litellm_model_name="gpt-4o",model_id="0816ddaaddd6d762d4ba80f754895c0386360bdecc35430e5644bba7eb905b4f",requested_model="openai-gpt-4o",team="None",team_alias="None"} 4.0
litellm_deployment_success_responses_total{api_base="https://my-test-instance.openai.azure.com//openai/",api_key_alias="None",api_provider="azure",hashed_api_key="None",litellm_model_name="gpt-4o",model_id="4346bb17b8f946ed63b7a315d50b765be26387b0ffe3f1875c37a1efdcf0e82e",requested_model="azure-gpt-4o",team="None",team_alias="None"} 3.0
litellm_deployment_success_responses_total{api_base="https://api.openai.com/v1",api_key_alias="None",api_provider="openai",hashed_api_key="EMPTY",litellm_model_name="gpt-4o",model_id="0816ddaaddd6d762d4ba80f754895c0386360bdecc35430e5644bba7eb905b4f",requested_model="openai-gpt-4o",team="None",team_alias="None"} 1.0

By stripping trailing slashes, this improves metrics aggregation and reduces custom metrics cost.

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Name	Status	Preview	Comments	Updated (UTC)
litellm	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 21, 2024 10:38pm

[korbit-ai]

I've completed my review and didn't find any issues... but I did find this squirrel.

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            '--'-'

Files scanned

​

File Path	Reviewed
litellm/router_utils/cooldown_callbacks.py	✅
litellm/integrations/prometheus.py	✅

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