litellm_docs: add missing environment variable documentation

docs/my-website/docs/proxy/config_settings.md

@@ -507,6 +507,7 @@ router_settings:
 | DD_AGENT_HOST | Hostname or IP of DataDog agent (e.g., "localhost"). When set, logs are sent to agent instead of direct API
 | DD_AGENT_PORT | Port of DataDog agent for log intake. Default is 10518
 | DD_API_KEY | API key for Datadog integration
+| DD_APP_KEY | Application key for Datadog Cost Management integration. Required along with DD_API_KEY for cost metrics
 | DD_SITE | Site URL for Datadog (e.g., datadoghq.com)
 | DD_SOURCE | Source identifier for Datadog logs
 | DD_TRACER_STREAMING_CHUNK_YIELD_RESOURCE | Resource name for Datadog tracing of streaming chunk yields. Default is "streaming.chunk.yield"
@@ -643,6 +644,10 @@ router_settings:
 | GENERIC_USERINFO_ENDPOINT | Endpoint to fetch user information in generic OAuth
 | GENERIC_LOGGER_ENDPOINT | Endpoint URL for the Generic Logger callback to send logs to
 | GENERIC_LOGGER_HEADERS | JSON string of headers to include in Generic Logger callback requests
+| GENERIC_ROLE_MAPPINGS_DEFAULT_ROLE | Default LiteLLM role to assign when no role mapping matches in generic SSO. Used with GENERIC_ROLE_MAPPINGS_ROLES
+| GENERIC_ROLE_MAPPINGS_GROUP_CLAIM | The claim/attribute name in the SSO token that contains the user's groups. Used for role mapping
+| GENERIC_ROLE_MAPPINGS_ROLES | Python dict string mapping LiteLLM roles to SSO group names. Example: `{"proxy_admin": ["admin-group"], "internal_user": ["users"]}`
+| GENERIC_USER_ROLE_MAPPINGS | Alternative to GENERIC_ROLE_MAPPINGS_ROLES for configuring user role mappings from SSO
 | GEMINI_API_BASE | Base URL for Gemini API. Default is https://generativelanguage.googleapis.com
 | GALILEO_BASE_URL | Base URL for Galileo platform
 | GALILEO_PASSWORD | Password for Galileo authentication
@@ -735,6 +740,7 @@ router_settings:
 | LITELLM_CLI_JWT_EXPIRATION_HOURS | Expiration time in hours for CLI-generated JWT tokens. Default is 24 hours
 | LITELLM_DD_AGENT_HOST | Hostname or IP of DataDog agent for LiteLLM-specific logging. When set, logs are sent to agent instead of direct API
 | LITELLM_DD_AGENT_PORT | Port of DataDog agent for LiteLLM-specific log intake. Default is 10518
+| LITELLM_DD_LLM_OBS_PORT | Port for Datadog LLM Observability agent. Default is 8126
 | LITELLM_DONT_SHOW_FEEDBACK_BOX | Flag to hide feedback box in LiteLLM UI
 | LITELLM_DROP_PARAMS | Parameters to drop in LiteLLM requests
 | LITELLM_MODIFY_PARAMS | Parameters to modify in LiteLLM requests
@@ -830,6 +836,7 @@ router_settings:
 | OPENMETER_EVENT_TYPE | Type of events sent to OpenMeter
 | ONYX_API_BASE | Base URL for Onyx Security AI Guard service (defaults to https://ai-guard.onyx.security)
 | ONYX_API_KEY | API key for Onyx Security AI Guard service
+| ONYX_TIMEOUT | Timeout in seconds for Onyx Guard server requests. Default is 10
 | OTEL_ENDPOINT | OpenTelemetry endpoint for traces
 | OTEL_EXPORTER_OTLP_ENDPOINT | OpenTelemetry endpoint for traces
 | OTEL_ENVIRONMENT_NAME | Environment name for OpenTelemetry
@@ -892,6 +899,8 @@ router_settings:
 | ROUTER_MAX_FALLBACKS | Maximum number of fallbacks for router. Default is 5
 | RUNWAYML_DEFAULT_API_VERSION | Default API version for RunwayML service. Default is "2024-11-06"
 | RUNWAYML_POLLING_TIMEOUT | Timeout in seconds for RunwayML image generation polling. Default is 600 (10 minutes)
+| S3_VECTORS_DEFAULT_DIMENSION | Default vector dimension for S3 Vectors RAG ingestion. Default is 1024
+| S3_VECTORS_DEFAULT_DISTANCE_METRIC | Default distance metric for S3 Vectors RAG ingestion. Options: "cosine", "euclidean". Default is "cosine"
 | SECRET_MANAGER_REFRESH_INTERVAL | Refresh interval in seconds for secret manager. Default is 86400 (24 hours)
 | SEPARATE_HEALTH_APP | If set to '1', runs health endpoints on a separate ASGI app and port. Default: '0'.
 | SEPARATE_HEALTH_PORT | Port for the separate health endpoints app. Only used if SEPARATE_HEALTH_APP=1. Default: 4001.