📝 Add docstrings to codex/create-json-dashboards-and-configure-alerts (#133)

Docstrings generation was requested by @shayancoin.

* #76 (comment)

The following files were modified:

* `backend/api/main.py`
* `backend/api/metrics.py`
* `backend/api/routes_observability.py`
* `backend/tests/test_observability_metrics.py`
* `frontend/src/app/reportWebVitals.ts`

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>
Co-authored-by: Shayan <shayan@coin.link>

Author: coderabbitai[bot]

backend/api/metrics.py

@@ -64,7 +64,16 @@ def observe_http_request(
     status: str,
     duration_seconds: float,
 ) -> None:
-    """Record a single HTTP request observation."""
+    """
+    Record a single HTTP request observation for Prometheus metrics.
+    
+    Parameters:
+    	service (str): Logical name of the service handling the request (e.g., "api", "frontend").
+    	route (str): HTTP route or path being requested (e.g., "/users/{id}").
+    	method (str): HTTP method used for the request (e.g., "GET", "POST").
+    	status (str): HTTP response status code or status label (e.g., "200", "500").
+    	duration_seconds (float): Request duration in seconds to record in the latency histogram.
+    """
 
     http_requests_total.labels(
         service=service, route=route, method=method, status=status

backend/tests/test_observability_metrics.py

@@ -24,6 +24,11 @@ def _get_sample(name: str, labels: dict[str, str]) -> float:
 
 
 def test_lcp_ingest_records_histogram() -> None:
+    """
+    Verify posting an LCP web-vital increments the LCP count histogram for the specified app.
+    
+    Sends an LCP payload to the observability ingest endpoint and asserts the `web_vitals_lcp_count` metric for `app="frontend"` increases by 1.
+    """
     before = _get_sample("web_vitals_lcp_count", {"app": "frontend"})
 
     response = client.post(