diff --git a/observability/README.md b/observability/README.md
index 0eb88782..2a40461f 100644
--- a/observability/README.md
+++ b/observability/README.md
@@ -15,6 +15,7 @@ Make sure to have:
   - Or follow our [tutorial](tutorials/00-install-kubernetes-env.md)
 
 After that you can run:
+
 ```bash
 sudo bash install.sh
 ```
diff --git a/src/tests/requirements.txt b/src/tests/requirements.txt
index 07fcefca..743b58aa 100644
--- a/src/tests/requirements.txt
+++ b/src/tests/requirements.txt
@@ -1,5 +1,5 @@
 fastapi
 httpx
-uvicorn
 openai
+uvicorn
 vllm
diff --git a/src/vllm_router/router.py b/src/vllm_router/router.py
index 7539d527..5d35464f 100644
--- a/src/vllm_router/router.py
+++ b/src/vllm_router/router.py
@@ -8,7 +8,7 @@
 import uvicorn
 from fastapi import FastAPI, Request, UploadFile
 from fastapi.responses import JSONResponse, Response, StreamingResponse
-from prometheus_client import Gauge, generate_latest, CONTENT_TYPE_LATEST
+from prometheus_client import CONTENT_TYPE_LATEST, Gauge, generate_latest
 
 from vllm_router.engine_stats import GetEngineStatsScraper, InitializeEngineStatsScraper
 from vllm_router.files import initialize_storage
@@ -47,13 +47,22 @@ async def lifespan(app: FastAPI):
     "vllm:num_requests_running", "Number of running requests", ["server"]
 )
 current_qps = Gauge("vllm:current_qps", "Current Queries Per Second", ["server"])
-avg_decoding_length = Gauge("vllm:avg_decoding_length", "Average Decoding Length", ["server"])
-num_prefill_requests = Gauge("vllm:num_prefill_requests", "Number of Prefill Requests", ["server"])
-num_decoding_requests = Gauge("vllm:num_decoding_requests", "Number of Decoding Requests", ["server"])
+avg_decoding_length = Gauge(
+    "vllm:avg_decoding_length", "Average Decoding Length", ["server"]
+)
+num_prefill_requests = Gauge(
+    "vllm:num_prefill_requests", "Number of Prefill Requests", ["server"]
+)
+num_decoding_requests = Gauge(
+    "vllm:num_decoding_requests", "Number of Decoding Requests", ["server"]
+)
 
-# --- Request Processing & Routing --- 
+
+# --- Request Processing & Routing ---
 # TODO: better request id system
-async def process_request(method, header, body, backend_url, request_id, endpoint, debug_request=None):
+async def process_request(
+    method, header, body, backend_url, request_id, endpoint, debug_request=None
+):
     """
     Async generator to stream data from the backend server to the client.
     """
@@ -81,7 +90,9 @@ async def process_request(method, header, body, backend_url, request_id, endpoin
             total_len += len(chunk)
             if not first_token:
                 first_token = True
-                GetRequestStatsMonitor().on_request_response(backend_url, request_id, time.time())
+                GetRequestStatsMonitor().on_request_response(
+                    backend_url, request_id, time.time()
+                )
             yield chunk
 
     GetRequestStatsMonitor().on_request_complete(backend_url, request_id, time.time())
@@ -89,6 +100,7 @@ async def process_request(method, header, body, backend_url, request_id, endpoin
     # Optional debug logging can be enabled here.
     # logger.debug(f"Finished the request with id: {debug_request.headers.get('x-request-id', None)} at {time.time()}")
 
+
 async def route_general_request(request: Request, endpoint: str):
     """
     Route the incoming request to the backend server and stream the response back to the client.
@@ -145,6 +157,7 @@ async def route_general_request(request: Request, endpoint: str):
         headers={key: value for key, value in headers.items()},
     )
 
+
 # --- File Endpoints ---
 @app.post("/files")
 async def route_files(request: Request):
@@ -171,6 +184,7 @@ async def route_files(request: Request):
             status_code=500, content={"error": f"Failed to save file: {str(e)}"}
         )
 
+
 @app.get("/files/{file_id}")
 async def route_get_file(file_id: str):
     try:
@@ -181,6 +195,7 @@ async def route_get_file(file_id: str):
             status_code=404, content={"error": f"File {file_id} not found"}
         )
 
+
 @app.get("/files/{file_id}/content")
 async def route_get_file_content(file_id: str):
     try:
@@ -192,20 +207,24 @@ async def route_get_file_content(file_id: str):
             status_code=404, content={"error": f"File {file_id} not found"}
         )
 
+
 # --- API Endpoints ---
 @app.post("/chat/completions")
 async def route_chat_completition(request: Request):
     return await route_general_request(request, "/v1/chat/completions")
 
+
 @app.post("/completions")
 async def route_completition(request: Request):
     return await route_general_request(request, "/v1/completions")
 
+
 @app.get("/version")
 async def show_version():
     ver = {"version": STACK_VERSION}
     return JSONResponse(content=ver)
 
+
 @app.get("/models")
 async def show_models():
     endpoints = GetServiceDiscovery().get_endpoint_info()
@@ -226,6 +245,7 @@ async def show_models():
     model_list = ModelList(data=model_cards)
     return JSONResponse(content=model_list.model_dump())
 
+
 @app.get("/health")
 async def health() -> Response:
     """Health check: verifies that service discovery and engine stats scraping are operational."""
@@ -239,6 +259,7 @@ async def health() -> Response:
         )
     return Response(status_code=200)
 
+
 # --- Prometheus Metrics Endpoint (v2 observation/tracking) ---
 @app.get("/metrics")
 async def metrics():
@@ -249,9 +270,12 @@ async def metrics():
         avg_decoding_length.labels(server=server).set(stat.ttft)
         num_prefill_requests.labels(server=server).set(stat.in_prefill_requests)
         num_decoding_requests.labels(server=server).set(stat.in_decoding_requests)
-        vnum_requests_running.labels(server=server).set(stat.in_prefill_requests + stat.in_decoding_requests)
+        vnum_requests_running.labels(server=server).set(
+            stat.in_prefill_requests + stat.in_decoding_requests
+        )
     return Response(generate_latest(), media_type=CONTENT_TYPE_LATEST)
 
+
 # --- Argument Parsing and Initialization ---
 def validate_args(args):
     if args.service_discovery == "static":