fix: resolve type gate regressions in prometheus caller identity validation

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

basedpyright-code-budget.json

@@ -1,6 +1,6 @@
 {
   "reportAny": {
-    "limit": 18494
+    "limit": 18483
   },
   "reportArgumentType": {
     "limit": 2564
@@ -24,7 +24,7 @@
     "limit": 19
   },
   "reportExplicitAny": {
-    "limit": 5968
+    "limit": 5960
   },
   "reportFunctionMemberAccess": {
     "limit": 7
@@ -57,7 +57,7 @@
     "limit": 5659
   },
   "reportMissingTypeArgument": {
-    "limit": 15494
+    "limit": 15484
   },
   "reportMissingTypeStubs": {
     "limit": 40
@@ -105,13 +105,13 @@
     "limit": 109
   },
   "reportUnknownMemberType": {
-    "limit": 38818
+    "limit": 38808
   },
   "reportUnknownParameterType": {
-    "limit": 19838
+    "limit": 19829
   },
   "reportUnknownVariableType": {
-    "limit": 30371
+    "limit": 30356
   },
   "reportUnnecessaryCast": {
     "limit": 117

litellm/types/integrations/prometheus.py

@@ -332,16 +332,17 @@ def validate_caller_identity_settings(litellm_settings: Mapping[str, object]) ->
     that request a label the selected mode removes."""
     if "prometheus_deployment_and_latency_caller_identity" not in litellm_settings:
         return
-    litellm.prometheus_deployment_and_latency_caller_identity = cast(
+    litellm.prometheus_deployment_and_latency_caller_identity = cast(  # cast-ok: validated on the next line, which raises on an invalid value
         'Literal["api_key_alias", "user_email", "both"]',
         litellm_settings["prometheus_deployment_and_latency_caller_identity"],
-    )  # cast-ok: validated on the next line, which raises on an invalid value
+    )
     caller_identity_mode: Final = validate_prometheus_deployment_and_latency_caller_identity()
     if caller_identity_mode != "user_email":
         return
+    raw_metrics_config: Final = litellm_settings.get("prometheus_metrics_config")
     conflicting_metrics: Final = tuple(
         metric_name
-        for metric_config in (litellm_settings.get("prometheus_metrics_config") or ())
+        for metric_config in (raw_metrics_config if isinstance(raw_metrics_config, list) else ())
         if isinstance(metric_config, dict) and "api_key_alias" in (metric_config.get("include_labels") or ())
         for metric_name in (metric_config.get("metrics") or ())
         if metric_name in PROMETHEUS_DEPLOYMENT_AND_LATENCY_CALLER_IDENTITY_METRICS

ruff-strict-budget.json

@@ -12,10 +12,10 @@
     "limit": 2012
   },
   "ANN202": {
-    "limit": 848
+    "limit": 847
   },
   "ANN204": {
-    "limit": 707
+    "limit": 706
   },
   "ANN205": {
     "limit": 112
@@ -24,7 +24,7 @@
     "limit": 133
   },
   "ANN401": {
-    "limit": 1155
+    "limit": 1153
   },
   "ASYNC230": {
     "limit": 11

type-discipline-budget.json

@@ -1,9 +1,9 @@
 {
   "LIT001": {
-    "limit": 22741
+    "limit": 22733
   },
   "LIT002": {
-    "limit": 26865
+    "limit": 26864
   },
   "LIT003": {
     "limit": 269
@@ -27,7 +27,7 @@
     "limit": 0
   },
   "LIT010": {
-    "limit": 16638
+    "limit": 16621
   },
   "LIT011": {
     "limit": 5585