fix: reduce Sub2API compact threshold and observe failures

scripts/src/platform-infra-sub2api-codex-sentinel.ts

@@ -1346,13 +1346,25 @@ def gateway_monitor_paths(config):
     return {"/responses", "/v1/responses", "/responses/compact", "/v1/responses/compact"}
 
 def gateway_failure_kind(message, payload, config):
-    if "openai.forward_failed" not in message or not isinstance(payload, dict):
+    if not isinstance(payload, dict):
         return None
     path = payload.get("path")
     if path not in gateway_monitor_paths(config):
         return None
     if payload.get("account_id") is None:
         return None
+    if "codex.remote_compact.failed" in message:
+        status = payload.get("status_code")
+        if isinstance(status, int) and status >= 500:
+            return "gateway-compact-final-failure"
+        return None
+    if "openai.upstream_failover_switching" in message and path in ("/responses/compact", "/v1/responses/compact"):
+        upstream_status = payload.get("upstream_status")
+        if isinstance(upstream_status, int) and upstream_status >= 500:
+            return "gateway-compact-upstream-failover"
+        return None
+    if "openai.forward_failed" not in message:
+        return None
     error_text = str(payload.get("error") or "").lower()
     fallback_written = payload.get("fallback_error_response_written") is True
     upstream_already_written = payload.get("upstream_error_response_already_written") is True
@@ -1404,7 +1416,7 @@ def gateway_failure_kind(message, payload, config):
     return None
 
 def gateway_failure_is_observe_only(failure_kind):
-    return failure_kind in {"gateway-session-affinity-failure"}
+    return failure_kind in {"gateway-session-affinity-failure", "gateway-compact-final-failure", "gateway-compact-upstream-failover"}
 
 def gateway_failure_item(ts, pod_name, payload, failure_kind):
     request_id = payload.get("request_id") or sha(json.dumps(payload, sort_keys=True, ensure_ascii=False))