* feat(prometheus): add api_provider label to token, latency, request and cache metrics
The token (input/output/total), latency (llm_api, time_to_first_token,
request_total, request_queue_time), proxy request (total/failed) and cache
metrics were emitted from the same call sites as litellm_spend_metric and
litellm_requests_metric, which already carry api_provider, yet these were
missing it. That left no way to break tokens, latency, request counts or cache
hits down by upstream provider even though the provider is already on the
payload as custom_llm_provider.
Add api_provider to each metric's label allow-list. The success path already
populates enum_values.api_provider from standard_logging_payload, so those
metrics emit it with no further plumbing. The cache label is added to the
shared _cache_metric_labels list, so alongside litellm_cache_hits_metric and
litellm_cache_misses_metric it also covers litellm_cached_tokens_metric and the
provider prompt-cache read/creation token metrics; the label-presence test
asserts all of them. For the client-side failure path, where a deployment may
not have been resolved, derive it best-effort from
litellm_params.custom_llm_provider, a partial standard_logging_object, or
inference from the requested model name via litellm.get_llm_provider, falling
back to empty rather than guessing.
Resolves LIT-4178
* fix(prometheus): satisfy ruff BLE001 budget and update enterprise label assertions
- Suppress the strict-rule BLE001 budget breach with a justified noqa;
the broad except in the failure-path provider extraction is
intentional defense-in-depth (covered by
test_extract_api_provider_swallows_unknown_model_but_logs_unexpected_errors),
not dead code to delete
- Update tests/enterprise assertions for litellm_tokens_metric,
litellm_input_tokens_metric, litellm_output_tokens_metric, the three
latency metrics, and the proxy request counters to expect the new
api_provider label, matching what litellm_mapped_enterprise_tests
caught in CI
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Co-authored-by: Shivi Jain <mobile.350017@gmail.com>
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