fix(litellm): Report both attempts' failure kinds in probe-failed

The failure line now preserves both attempts' failure kinds instead of
hardcoding 'timeout after retry, 45s'. If both attempts fail, the report
shows: 'probe-failed: <model> <first kind> then <retry kind> (2 attempts)'.

This fixes the self-contradictory output when the first attempt timed out
but the retry failed with connection refused, and prevents the duration
from appearing twice when both attempts were timeouts.

Example outputs:
- timeout then timeout: 'probe-failed: gpu-dense timeout after 30s then timeout after 45s (2 attempts)'
- timeout then refused: 'probe-failed: gpu-dense timeout after 30s then connection refused (2 attempts)'
- refused then refused: 'probe-failed: gpu-dense connection refused then connection refused (2 attempts)'

scripts/litellm-health-check.py

@@ -124,8 +124,10 @@ def check_model_probes():
                                        data='{"model":"' + model + '","messages":[{"role":"user","content":"health ' + str(random.randint(1000, 9999)) + '"}],"max_tokens":4}',
                                        timeout=30)
         
+        first_kind = None  # Track first attempt's failure kind
         if code == 000 and failure_kind:
             # Retry once with longer timeout (45s) before declaring failure
+            first_kind = failure_kind
             time.sleep(1)
             code, failure_kind = probe_http("http://" + BACKEND_HOST + "/litellm/v1/chat/completions",
                                            method="POST",
@@ -134,8 +136,11 @@ def check_model_probes():
                                            timeout=45)
         
         if code == 000 and failure_kind:
-            # Both attempts failed - report with duration
-            results.append((model, False, "probe-failed: " + model + " " + failure_kind + " (timeout after retry, 45s)"))
+            # Both attempts failed - report both kinds
+            if first_kind:
+                results.append((model, False, "probe-failed: " + model + " " + first_kind + " then " + failure_kind + " (2 attempts)"))
+            else:
+                results.append((model, False, "probe-failed: " + model + " " + failure_kind))
         elif code == 200:
             results.append((model, True, str(code) + " (target: " + BACKEND_HOST + "/litellm/v1/chat/completions, model=" + model + ")"))
         elif code in (401, 403):