docs: update README and ARCHITECTURE for show_failed parameter

- README: add show_failed to litellm_history params
- ARCHITECTURE: update params line and add Filtering section explaining
  show_failed=False behavior and header indicator

ARCHITECTURE.md

@@ -161,7 +161,7 @@ By Date:
 
 **LiteLLM Endpoint:** `GET {litellm_url}/spend/logs`
 **Auth:** `Authorization: Bearer {litellm_master_key}`
-**Params:** `limit` (int, 1-50, default 20), `show_cost` (bool, default true)
+**Params:** `limit` (int, 1-50, default 20), `show_cost` (bool, default true), `show_failed` (bool, default true)
 
 ### Response Processing
 
@@ -169,6 +169,8 @@ The `/spend/logs` endpoint returns **all** historical request logs (no server-si
 
 **Performance note:** For large deployments (thousands of logs), this endpoint can be slow. The tool caps `limit` at 50 and uses a 30s timeout.
 
+**Filtering:** When `show_failed=False`, requests with `metadata.exception` or `metadata.status="failure"` are filtered out before applying the `limit`. This hides auth probe noise, routing failures, and other non-essential errors. The header shows "(failed requests hidden)" when active.
+
 ### Per-Request Fields
 
 | Field | Description |

README.md

@@ -16,6 +16,7 @@ Get recent LiteLLM request history. Returns the most recent N requests with mode
 **Parameters:**
 - `limit` (int, 1-50, default 20): Number of recent requests to show
 - `show_cost` (bool, default true): Include per-request cost
+- `show_failed` (bool, default true): Include failed requests. Set false to hide auth failures, routing errors, and probe noise.
 
 **Cost awareness:** This function hits `/spend/logs` which returns all historical logs. For large deployments, this can be a heavy query. Use reasonable `limit` values.