diff --git a/litellm/integrations/otel/destination_logger.py b/litellm/integrations/otel/destination_logger.py
index f8a26771224..1138e860312 100644
--- a/litellm/integrations/otel/destination_logger.py
+++ b/litellm/integrations/otel/destination_logger.py
@@ -13,6 +13,7 @@ owning logger, and including it here would export the same call twice.
 from collections.abc import Mapping
 from datetime import datetime
 from functools import lru_cache
+from types import MappingProxyType
 from typing import TYPE_CHECKING, Any, Final
 
 from opentelemetry.trace import Span
@@ -41,7 +42,7 @@ def _vocabulary_config(backend: str) -> OpenTelemetryV2Config:
         config: Final = preset_fn(allow_missing_credentials=True)
     except Exception:  # noqa: BLE001  # an unbuildable preset still has a usable default vocabulary
         return OpenTelemetryV2Config()
-    return config.model_copy(update={"exporters": ()})
+    return config.model_copy(update=MappingProxyType({"exporters": ()}))
 
 
 class _DestinationOnlyOtel(OpenTelemetryV2):
@@ -133,7 +134,8 @@ class AdminDestinationLogger(CustomLogger):
         end_time: "datetime | float | None",
     ) -> None:
         owned: Final = otel_v2_owned_backends()
-        for backend in sorted({d.callback_name for d in request_destinations() if d.callback_name} - owned):
+        requested: Final = frozenset(d.callback_name for d in request_destinations() if d.callback_name)
+        for backend in sorted(requested - owned):
             try:
                 self._emitter_for(backend).export_to_destinations(kwargs, start_time, end_time)
             except Exception as exc:  # noqa: BLE001  # one destination's failure must not break the request or the others
diff --git a/litellm/integrations/otel/plumbing/providers.py b/litellm/integrations/otel/plumbing/providers.py
index 38764219f14..ae85359a61f 100644
--- a/litellm/integrations/otel/plumbing/providers.py
+++ b/litellm/integrations/otel/plumbing/providers.py
@@ -1,6 +1,7 @@
 """Provider / exporter factory + the Baggage span processor."""
 
 from collections.abc import Callable, Iterable, Mapping
+from types import MappingProxyType
 from typing import TYPE_CHECKING, Any, Final
 
 from opentelemetry import _logs, baggage, metrics
@@ -133,7 +134,7 @@ def destination_resource_attrs(destination: "OtelDestination") -> Mapping[str, s
     ``model_id`` / ``arize.project.name``; empty for header-routed backends), read
     by both export paths so the gen-AI span and its parents share one Resource.
     """
-    return dict(destination.resource_attributes)
+    return MappingProxyType(dict(destination.resource_attributes))
 
 
 def parse_headers(raw: str | None) -> dict[str, str]:
diff --git a/litellm/integrations/otel/plumbing/routing.py b/litellm/integrations/otel/plumbing/routing.py
index f025fb213ac..f66ef99b45a 100644
--- a/litellm/integrations/otel/plumbing/routing.py
+++ b/litellm/integrations/otel/plumbing/routing.py
@@ -6,6 +6,8 @@
 
 import threading
 from collections import OrderedDict
+from itertools import chain
+from types import MappingProxyType
 from typing import TYPE_CHECKING, Final
 
 from opentelemetry.context import Context
@@ -178,11 +180,15 @@ class TenantTracerCache:
         )
         if not owns_exporter:
             return self._config.model_copy(
-                update={"exporters": [*self._config.exporters, *self._synthesized_exporter(header_str, dynamic_params)]}
+                update=MappingProxyType(
+                    {
+                        "exporters": [*self._config.exporters, *self._synthesized_exporter(header_str, dynamic_params)]
+                    }  # mutable-ok: model_copy bypasses validation, so the field's declared list/dict type must be built as-is
+                )
             )
         exporters: Final = [
             (
-                spec.model_copy(update={"headers": header_str})
+                spec.model_copy(update=MappingProxyType({"headers": header_str}))
                 if spec.owner == self._callback_name and spec.kind.lower() not in _NON_OTLP_KINDS
                 else spec
             )
@@ -228,13 +234,14 @@ class TenantTracerCache:
             destination_resource_attrs,
         )
 
-        groups: OrderedDict[tuple[tuple[str, str], ...], list[OtelDestination]] = (
-            OrderedDict()
-        )  # mutable-ok: insertion-order grouping accumulator, frozen before return
-        for destination in destinations:
-            key = tuple(sorted(destination_resource_attrs(destination).items()))
-            groups.setdefault(key, []).append(destination)
-        return tuple((key, tuple(group)) for key, group in sorted(groups.items()))
+        keyed: Final = tuple(
+            (tuple(sorted(destination_resource_attrs(destination).items())), destination)
+            for destination in destinations
+        )
+        return tuple(
+            (key, tuple(destination for other_key, destination in keyed if other_key == key))
+            for key in sorted(frozenset(key for key, _ in keyed))
+        )
 
     def _tracer_for_group(
         self,
@@ -300,15 +307,24 @@ class TenantTracerCache:
             for d in destinations
         )
         base_exporters: Final = (*self._config.exporters,) if include_base_exporters else ()
-        merged_resource_attrs: Final = {
-            **self._config.resource_attributes,
-            **{key: value for d in destinations for key, value in destination_resource_attrs(d).items()},
-        }
+        merged_resource_attrs: Final = (
+            dict(  # mutable-ok: model_copy bypasses validation, so the declared dict field must be built as-is
+                chain(
+                    self._config.resource_attributes.items(),
+                    ((key, value) for d in destinations for key, value in destination_resource_attrs(d).items()),
+                )
+            )
+        )
         return self._config.model_copy(
-            update={
-                "exporters": [*base_exporters, *appended],
-                "resource_attributes": merged_resource_attrs,
-            }
+            update=MappingProxyType(
+                {
+                    "exporters": [
+                        *base_exporters,
+                        *appended,
+                    ],  # mutable-ok: model_copy bypasses validation, so the field's declared list/dict type must be built as-is
+                    "resource_attributes": merged_resource_attrs,
+                }
+            )
         )
 
 
@@ -322,8 +338,7 @@ def _processor_key(destination: OtelDestination) -> "tuple[str, tuple[tuple[str,
 
 
 def _is_genai_span(span: ReadableSpan) -> bool:
-    attributes: Final = span.attributes or {}
-    return _GENAI_SPAN_ATTR in attributes
+    return span.attributes is not None and _GENAI_SPAN_ATTR in span.attributes
 
 
 def _with_destination_resource(span: ReadableSpan, destination: OtelDestination) -> ReadableSpan:
@@ -336,7 +351,7 @@ def _with_destination_resource(span: ReadableSpan, destination: OtelDestination)
     extra: Final = destination_resource_attrs(destination)
     if not extra:
         return span
-    merged: Final = Resource.create({**dict(span.resource.attributes), **extra})
+    merged: Final = Resource.create(MappingProxyType(dict(chain(span.resource.attributes.items(), extra.items()))))
     return _ResourceWrappedReadableSpan(span, merged)
 
 
diff --git a/litellm/integrations/otel/presets/__init__.py b/litellm/integrations/otel/presets/__init__.py
index 47a34fe7239..263acfdfba4 100644
--- a/litellm/integrations/otel/presets/__init__.py
+++ b/litellm/integrations/otel/presets/__init__.py
@@ -15,7 +15,8 @@ tracer for the integrations that support it; ``dynamic_otlp_headers`` below buil
 those per-request headers.
 """
 
-from collections.abc import Callable
+from collections.abc import Callable, Mapping
+from types import MappingProxyType
 from typing import TYPE_CHECKING, Final
 
 from litellm.integrations.otel.presets.agentops import agentops_preset
@@ -39,17 +40,21 @@ if TYPE_CHECKING:
 #: routing). Only integrations that support dynamic credentials appear here —
 #: Arize-Phoenix/Langtrace/Levo/AgentOps/generic don't, so they use the logger's
 #: default tracer.
-DYNAMIC_HEADERS_BY_CALLBACK: Final[dict[str, Callable[[StandardCallbackDynamicParams], dict[str, str]]]] = {
-    "arize": arize_dynamic_headers,
-    "langfuse_otel": langfuse_dynamic_headers,
-    "weave_otel": weave_dynamic_headers,
-}
+DYNAMIC_HEADERS_BY_CALLBACK: Final[Mapping[str, Callable[[StandardCallbackDynamicParams], Mapping[str, str]]]] = (
+    MappingProxyType(
+        {
+            "arize": arize_dynamic_headers,
+            "langfuse_otel": langfuse_dynamic_headers,
+            "weave_otel": weave_dynamic_headers,
+        }
+    )
+)
 
 
 def dynamic_otlp_headers(
     callback_name: str | None,
     dynamic_params: "StandardCallbackDynamicParams | None",
-) -> dict[str, str] | None:
+) -> Mapping[str, str] | None:
     """Per-request OTLP headers for ``callback_name``, or ``None`` if N/A.
 
     ``None`` means "no per-request routing" — the caller uses its default tracer.
@@ -76,22 +81,26 @@ def dynamic_otlp_destination(
 
     if callback_name not in DYNAMIC_HEADERS_BY_CALLBACK or not dynamic_params:
         return None
-    values: Final = {str(key): str(value) for key, value in dynamic_params.items() if isinstance(value, str)}
+    values: Final = MappingProxyType(
+        {str(key): str(value) for key, value in dynamic_params.items() if isinstance(value, str)}
+    )
     return build_destination(callback_name or "", values)
 
 
 #: Callback name → preset. The ``Preset`` annotation makes mypy verify every
 #: registered value matches the preset interface.
-PRESET_BY_CALLBACK: Final[dict[str, Preset]] = {
-    "agentops": agentops_preset,
-    "arize": arize_preset,
-    "arize_phoenix": phoenix_preset,
-    "generic": generic_preset,
-    "langfuse_otel": langfuse_preset,
-    "langtrace": langtrace_preset,
-    "levo": levo_preset,
-    "weave_otel": weave_preset,
-}
+PRESET_BY_CALLBACK: Final[Mapping[str, Preset]] = MappingProxyType(
+    {
+        "agentops": agentops_preset,
+        "arize": arize_preset,
+        "arize_phoenix": phoenix_preset,
+        "generic": generic_preset,
+        "langfuse_otel": langfuse_preset,
+        "langtrace": langtrace_preset,
+        "levo": levo_preset,
+        "weave_otel": weave_preset,
+    }
+)
 
 
 __all__ = [
diff --git a/litellm/integrations/otel/presets/agentops.py b/litellm/integrations/otel/presets/agentops.py
index 6811f0b4e7d..63b847b86ba 100644
--- a/litellm/integrations/otel/presets/agentops.py
+++ b/litellm/integrations/otel/presets/agentops.py
@@ -57,14 +57,19 @@ def agentops_preset(
             ExporterSpec(
                 kind=_AGENTOPS_EXPORTER_KIND,
                 endpoint=_AGENTOPS_ENDPOINT,
-                options=({"api_key": settings.api_key} if settings.api_key else None),
+                options=(
+                    {"api_key": settings.api_key} if settings.api_key else None
+                ),  # mutable-ok: ExporterSpec.options is a mutable dict field
                 owner=ExporterOwner.AGENTOPS,
             ),
         )
     )
     return base.model_copy(
         update={
-            "exporters": [*base.exporters, *global_exporter],
+            "exporters": [
+                *base.exporters,
+                *global_exporter,
+            ],  # mutable-ok: model_copy bypasses validation, so the field's declared list/dict type must be built as-is
             "resource_attributes": {
                 **base.resource_attributes,
                 "service.name": settings.service_name,
diff --git a/litellm/integrations/otel/presets/arize.py b/litellm/integrations/otel/presets/arize.py
index cc1fb393832..802c651d7af 100644
--- a/litellm/integrations/otel/presets/arize.py
+++ b/litellm/integrations/otel/presets/arize.py
@@ -51,7 +51,10 @@ def arize_preset(
     )
     return base.model_copy(
         update={
-            "exporters": [*base.exporters, *global_exporter],
+            "exporters": [
+                *base.exporters,
+                *global_exporter,
+            ],  # mutable-ok: model_copy bypasses validation, so the field's declared list/dict type must be built as-is
             "mapper_names": ensure_mappers(base.mapper_names, "openinference"),
             "resource_attributes": {
                 **base.resource_attributes,
diff --git a/litellm/integrations/otel/presets/destinations.py b/litellm/integrations/otel/presets/destinations.py
index 9a727ff0dd1..4748eb599ab 100644
--- a/litellm/integrations/otel/presets/destinations.py
+++ b/litellm/integrations/otel/presets/destinations.py
@@ -12,6 +12,7 @@ credential values only.
 
 import os
 from collections.abc import Callable, Mapping
+from types import MappingProxyType
 from typing import Final
 
 from litellm.integrations.langfuse.langfuse_otel import (
@@ -26,7 +27,7 @@ from litellm.integrations.weave.weave_otel import (
 
 def _parse_header_string(raw: str) -> Mapping[str, str]:
     pairs: Final = (item.split("=", 1) for item in raw.split(",") if "=" in item)
-    return {key.strip(): value.strip() for key, value in pairs}
+    return MappingProxyType({key.strip(): value.strip() for key, value in pairs})
 
 
 def _langfuse_endpoint(host: str) -> str:
@@ -44,7 +45,7 @@ def _langfuse_destination(values: Mapping[str, str]) -> OtelDestination | None:
     auth: Final = LangfuseOtelLogger._get_langfuse_authorization_header(  # pyright: ignore[reportPrivateUsage]  # shared v1 header builder
         public_key=public_key, secret_key=secret_key
     )
-    return OtelDestination(endpoint=endpoint, headers={"Authorization": auth})
+    return OtelDestination(endpoint=endpoint, headers=MappingProxyType({"Authorization": auth}))
 
 
 def _arize_destination(values: Mapping[str, str]) -> OtelDestination | None:
@@ -60,10 +61,12 @@ def _arize_destination(values: Mapping[str, str]) -> OtelDestination | None:
     project: Final = (
         values.get("arize_project_name") or values.get("project_name") or os.environ.get("ARIZE_PROJECT_NAME")
     )
-    resource_attributes: Final = {"model_id": project, "arize.project.name": project} if project else {}
+    resource_attributes: Final = MappingProxyType(
+        {"model_id": project, "arize.project.name": project} if project else {}
+    )
     return OtelDestination(
         endpoint=endpoint,
-        headers={"space_id": space, "api_key": api_key},
+        headers=MappingProxyType({"space_id": space, "api_key": api_key}),
         resource_attributes=resource_attributes,
         protocol="otlp_http" if http_endpoint and not values.get("arize_endpoint") else None,
     )
@@ -80,10 +83,15 @@ def _weave_destination(values: Mapping[str, str]) -> OtelDestination | None:
 
     base: Final = (values.get("weave_endpoint") or WEAVE_BASE_URL).rstrip("/")
     endpoint: Final = base if base.endswith("/v1/traces") else base.removesuffix("/otel") + WEAVE_OTEL_ENDPOINT
-    headers: Final = {"Authorization": _get_weave_authorization_header(api_key=api_key)}
     project_id: Final = values.get("weave_project_id")
-    if project_id:
-        headers["project_id"] = project_id
+    headers: Final = MappingProxyType(
+        dict(
+            (
+                ("Authorization", _get_weave_authorization_header(api_key=api_key)),
+                *((("project_id", project_id),) if project_id else ()),
+            )
+        )
+    )
     return OtelDestination(endpoint=endpoint, headers=headers)
 
 
@@ -108,11 +116,13 @@ def _generic_destination(values: Mapping[str, str]) -> OtelDestination | None:
     )
 
 
-_ADAPTERS: Final[Mapping[str, Callable[[Mapping[str, str]], OtelDestination | None]]] = {
-    "langfuse_otel": _langfuse_destination,
-    "arize": _arize_destination,
-    "weave_otel": _weave_destination,
-}
+_ADAPTERS: Final[Mapping[str, Callable[[Mapping[str, str]], OtelDestination | None]]] = MappingProxyType(
+    {
+        "langfuse_otel": _langfuse_destination,
+        "arize": _arize_destination,
+        "weave_otel": _weave_destination,
+    }
+)
 
 OTEL_V2_DESTINATION_CALLBACKS: Final = frozenset(_ADAPTERS)
 
@@ -125,7 +135,7 @@ def build_destination(callback_name: str, values: Mapping[str, str]) -> OtelDest
     host (an easy slip in the create form) yields a malformed OTLP URL the
     exporter rejects with a 404, so whitespace is never significant here.
     """
-    trimmed: Final = {key: value.strip() for key, value in values.items()}
+    trimmed: Final = MappingProxyType({key: value.strip() for key, value in values.items()})
     adapter: Final = _ADAPTERS.get(callback_name)
     if adapter is not None:
         destination: Final = adapter(trimmed)
diff --git a/litellm/integrations/otel/presets/langfuse.py b/litellm/integrations/otel/presets/langfuse.py
index 7aba454d893..f6f7a566dc8 100644
--- a/litellm/integrations/otel/presets/langfuse.py
+++ b/litellm/integrations/otel/presets/langfuse.py
@@ -1,5 +1,7 @@
 """Langfuse-OTEL preset."""
 
+from collections.abc import Mapping
+from types import MappingProxyType
 from typing import Final
 
 from litellm.integrations.langfuse.langfuse_otel import (
@@ -14,7 +16,7 @@ from litellm.integrations.otel.presets.utils import ensure_mappers
 from litellm.types.utils import StandardCallbackDynamicParams
 
 
-def langfuse_dynamic_headers(params: StandardCallbackDynamicParams) -> dict[str, str]:
+def langfuse_dynamic_headers(params: StandardCallbackDynamicParams) -> Mapping[str, str]:
     """Per-request Langfuse OTLP headers from team/key dynamic params."""
     public_key: Final = params.get("langfuse_public_key")
     secret_key: Final = params.get("langfuse_secret_key")
@@ -24,7 +26,7 @@ def langfuse_dynamic_headers(params: StandardCallbackDynamicParams) -> dict[str,
                 public_key=public_key, secret_key=secret_key
             )
         )
-    return {}
+    return MappingProxyType({})
 
 
 def langfuse_preset(
@@ -39,7 +41,7 @@ def langfuse_preset(
     except Exception:
         if not allow_missing_credentials:
             raise
-        return base.model_copy(update={"mapper_names": mappers})
+        return base.model_copy(update=MappingProxyType({"mapper_names": mappers}))
     kind: Final = cfg.exporter if isinstance(cfg.exporter, str) else "otlp_http"
     return base.model_copy(
         update={
diff --git a/litellm/integrations/otel/presets/phoenix.py b/litellm/integrations/otel/presets/phoenix.py
index 020086a0acd..4820d010976 100644
--- a/litellm/integrations/otel/presets/phoenix.py
+++ b/litellm/integrations/otel/presets/phoenix.py
@@ -44,7 +44,10 @@ def phoenix_preset(
     )
     return base.model_copy(
         update={
-            "exporters": [*base.exporters, *global_exporter],
+            "exporters": [
+                *base.exporters,
+                *global_exporter,
+            ],  # mutable-ok: model_copy bypasses validation, so the field's declared list/dict type must be built as-is
             "mapper_names": ensure_mappers(base.mapper_names, "openinference"),
             "resource_attributes": {
                 **base.resource_attributes,
diff --git a/litellm/integrations/otel/presets/weave.py b/litellm/integrations/otel/presets/weave.py
index 8c0dc3f2c6f..cb156797e9b 100644
--- a/litellm/integrations/otel/presets/weave.py
+++ b/litellm/integrations/otel/presets/weave.py
@@ -1,5 +1,7 @@
 """Weave (W&B) preset."""
 
+from collections.abc import Mapping
+from types import MappingProxyType
 from typing import Final
 
 from litellm.integrations.otel.model.config import (
@@ -15,16 +17,18 @@ from litellm.integrations.weave.weave_otel import (
 from litellm.types.utils import StandardCallbackDynamicParams
 
 
-def weave_dynamic_headers(params: StandardCallbackDynamicParams) -> dict[str, str]:
+def weave_dynamic_headers(params: StandardCallbackDynamicParams) -> Mapping[str, str]:
     """Per-request Weave OTLP headers from team/key dynamic params."""
-    headers: Final[dict[str, str]] = {}
     api_key: Final = params.get("wandb_api_key")
-    if api_key:
-        headers["Authorization"] = _get_weave_authorization_header(api_key=api_key)
     project_id: Final = params.get("weave_project_id")
-    if project_id:
-        headers["project_id"] = project_id
-    return headers
+    return MappingProxyType(
+        dict(
+            (
+                *((("Authorization", _get_weave_authorization_header(api_key=api_key)),) if api_key else ()),
+                *((("project_id", project_id),) if project_id else ()),
+            )
+        )
+    )
 
 
 def weave_preset(
@@ -39,7 +43,7 @@ def weave_preset(
     except Exception:
         if not allow_missing_credentials:
             raise
-        return base.model_copy(update={"mapper_names": mappers})
+        return base.model_copy(update=MappingProxyType({"mapper_names": mappers}))
     return base.model_copy(
         update={
             "exporters": [
diff --git a/litellm/litellm_core_utils/litellm_logging.py b/litellm/litellm_core_utils/litellm_logging.py
index 1cd23414441..ec902cbd58a 100644
--- a/litellm/litellm_core_utils/litellm_logging.py
+++ b/litellm/litellm_core_utils/litellm_logging.py
@@ -4036,7 +4036,12 @@ def _init_custom_logger_compatible_class(
                 config: Final = (
                     initial_config
                     if initial_config.exporters
-                    else OpenTelemetryV2Config(**{**settings, "exporter": initial_config.exporter})
+                    else OpenTelemetryV2Config(
+                        **{
+                            **settings,
+                            "exporter": initial_config.exporter,
+                        }  # mutable-ok: keyword expansion needs a dict
+                    )
                 )
                 otel_logger_v2: Final = OpenTelemetryV2(config=config)
                 _in_memory_loggers.append(otel_logger_v2)
diff --git a/litellm/proxy/auth/user_api_key_auth.py b/litellm/proxy/auth/user_api_key_auth.py
index e406e29724a..b8f51302dea 100644
--- a/litellm/proxy/auth/user_api_key_auth.py
+++ b/litellm/proxy/auth/user_api_key_auth.py
@@ -13,6 +13,7 @@ import re
 import secrets
 from contextlib import suppress
 from datetime import datetime, timezone
+from types import MappingProxyType
 from typing import Any, Final, NamedTuple, Protocol, Union, cast
 
 import fastapi
@@ -1039,8 +1040,8 @@ async def _hoist_request_destinations(request: Request, user_api_key_dict: UserA
             OtelDestination(
                 callback_name=item.get("callback_name"),
                 endpoint=item.get("endpoint", ""),
-                headers=item.get("headers") or {},
-                resource_attributes=item.get("resource_attributes") or {},
+                headers=item.get("headers") or MappingProxyType({}),
+                resource_attributes=item.get("resource_attributes") or MappingProxyType({}),
                 protocol=item.get("protocol"),
             )
             for item in destinations_raw
diff --git a/litellm/proxy/credential_endpoints/endpoints.py b/litellm/proxy/credential_endpoints/endpoints.py
index dc8ff36de0f..bb4f8c0618a 100644
--- a/litellm/proxy/credential_endpoints/endpoints.py
+++ b/litellm/proxy/credential_endpoints/endpoints.py
@@ -2,6 +2,7 @@
 CRUD endpoints for storing reusable credentials.
 """
 
+from types import MappingProxyType
 from typing import Final
 
 from fastapi import APIRouter, Depends, HTTPException, Path, Request, Response
@@ -138,9 +139,9 @@ async def get_credentials(
                 "credential_values": _get_masked_values(credential.credential_values),
                 "credential_info": credential.credential_info,
                 **(
-                    {"resolves_to_destination": destination_for_credential(credential) is not None}
+                    MappingProxyType({"resolves_to_destination": destination_for_credential(credential) is not None})
                     if is_logging_credential(credential.credential_info)
-                    else {}
+                    else MappingProxyType({})
                 ),
             }
             for credential in litellm.credential_list
diff --git a/litellm/proxy/litellm_pre_call_utils.py b/litellm/proxy/litellm_pre_call_utils.py
index 4f7a13ab2ca..9df304ab527 100644
--- a/litellm/proxy/litellm_pre_call_utils.py
+++ b/litellm/proxy/litellm_pre_call_utils.py
@@ -743,6 +743,17 @@ async def _effective_org_id(user_api_key_dict: UserAPIKeyAuth) -> str | None:
     return getattr(team_obj, "organization_id", None)
 
 
+def _destination_params(backend: str, destination: "OtelDestination") -> "OtelDestinationParams":
+    params: Final[OtelDestinationParams] = {
+        "callback_name": backend,
+        "endpoint": destination.endpoint,
+        "headers": destination.headers,
+        "resource_attributes": destination.resource_attributes,
+        "protocol": destination.protocol,
+    }
+    return params
+
+
 async def _resolve_logging_exporters(
     user_api_key_dict: UserAPIKeyAuth,
 ) -> "tuple[tuple[OtelDestinationParams, ...], tuple[str, ...]]":
@@ -795,26 +806,21 @@ async def _resolve_logging_exporters(
         if access_grants(info.access, team_ids, org_ids)
         if (result := destination_for_credential(credential)) is not None
     )
-    deduped: Final = {
-        (
-            destination.endpoint,
-            tuple(sorted(destination.headers.items())),
-            tuple(sorted(destination.resource_attributes.items())),
-        ): (
-            backend,
-            destination,
-        )
-        for backend, destination in built
-    }
-    destinations: Final[tuple[OtelDestinationParams, ...]] = tuple(
+    deduped: Final = MappingProxyType(
         {
-            "callback_name": backend,
-            "endpoint": destination.endpoint,
-            "headers": destination.headers,
-            "resource_attributes": destination.resource_attributes,
-            "protocol": destination.protocol,
+            (
+                destination.endpoint,
+                tuple(sorted(destination.headers.items())),
+                tuple(sorted(destination.resource_attributes.items())),
+            ): (
+                backend,
+                destination,
+            )
+            for backend, destination in built
         }
-        for backend, destination in deduped.values()
+    )
+    destinations: Final[tuple[OtelDestinationParams, ...]] = tuple(
+        _destination_params(backend, destination) for backend, destination in deduped.values()
     )
     backends: Final = tuple(dict.fromkeys(backend for backend, _ in deduped.values()))
     return destinations, backends
diff --git a/litellm/proxy/management_endpoints/logging_exporter_access.py b/litellm/proxy/management_endpoints/logging_exporter_access.py
index 621c22ac000..0bdebf3cc32 100644
--- a/litellm/proxy/management_endpoints/logging_exporter_access.py
+++ b/litellm/proxy/management_endpoints/logging_exporter_access.py
@@ -10,6 +10,7 @@ scope is the given set of team ids and org ids. The resolver passes a
 one-element scope built with ``identity_scope``.
 """
 
+from types import MappingProxyType
 from typing import TYPE_CHECKING, Final
 
 from pydantic import BaseModel, ConfigDict, ValidationError
@@ -127,15 +128,19 @@ def destination_for_credential(credential: CredentialItem) -> 'tuple[str, "OtelD
     from litellm.integrations.otel.presets import PRESET_BY_CALLBACK
     from litellm.integrations.otel.presets.destinations import build_destination
 
-    backend: Final = (credential.credential_info or {}).get("description")
+    backend: Final = (credential.credential_info or MappingProxyType({})).get("description")
     if not backend:
         return None
     # Drop unset (``None``) values rather than stringifying them: ``str(None)`` is the
     # literal ``"None"``, which would land in the exporter endpoint/headers and break
     # the export (e.g. an empty ``otel_endpoint`` becoming the URL ``"None"``).
-    values: Final = {
-        str(key): str(value) for key, value in (credential.credential_values or {}).items() if value is not None
-    }
+    values: Final = MappingProxyType(
+        {
+            str(key): str(value)
+            for key, value in (credential.credential_values or MappingProxyType({})).items()
+            if value is not None
+        }
+    )
     destination: Final = build_destination(backend, values)
     if destination is None:
         return None
diff --git a/litellm/proxy/management_endpoints/logging_exporter_validation.py b/litellm/proxy/management_endpoints/logging_exporter_validation.py
index 002cbc9249f..b52d22cbb2f 100644
--- a/litellm/proxy/management_endpoints/logging_exporter_validation.py
+++ b/litellm/proxy/management_endpoints/logging_exporter_validation.py
@@ -24,23 +24,29 @@ def validate_credential_access(credential_info: Mapping[str, object] | None) ->
     if not isinstance(access, dict):
         raise HTTPException(
             status_code=status.HTTP_400_BAD_REQUEST,
-            detail={"error": "credential_info.access must be an object"},
+            detail={
+                "error": "credential_info.access must be an object"
+            },  # mutable-ok: FastAPI serializes the detail dict
         )
     if "global" in access and not isinstance(access["global"], bool):
         raise HTTPException(
             status_code=status.HTTP_400_BAD_REQUEST,
-            detail={"error": "access.global must be a boolean"},
+            detail={"error": "access.global must be a boolean"},  # mutable-ok: FastAPI serializes the detail dict
         )
     for field in ("teams", "orgs"):
         bucket = access.get(field)
         if bucket is not None and not (isinstance(bucket, list) and all(isinstance(item, str) for item in bucket)):
             raise HTTPException(
                 status_code=status.HTTP_400_BAD_REQUEST,
-                detail={"error": f"access.{field} must be a list of strings"},
+                detail={
+                    "error": f"access.{field} must be a list of strings"
+                },  # mutable-ok: FastAPI serializes the detail dict
             )
-    unknown: Final = set(access) - {"global", "teams", "orgs"}
+    unknown: Final = frozenset(access) - frozenset(("global", "teams", "orgs"))
     if unknown:
         raise HTTPException(
             status_code=status.HTTP_400_BAD_REQUEST,
-            detail={"error": f"access contains unknown field(s): {sorted(unknown)}"},
+            detail={
+                "error": f"access contains unknown field(s): {sorted(unknown)}"
+            },  # mutable-ok: FastAPI serializes the detail dict
         )
diff --git a/type-discipline-budget.json b/type-discipline-budget.json
index 15a1490885e..ca848190a32 100644
--- a/type-discipline-budget.json
+++ b/type-discipline-budget.json
@@ -3,7 +3,7 @@
     "limit": 22909
   },
   "LIT002": {
-    "limit": 26927
+    "limit": 26898
   },
   "LIT003": {
     "limit": 269