diff --git a/site/app.py b/site/app.py
index a3e2807..28b113a 100644
--- a/site/app.py
+++ b/site/app.py
@@ -6,7 +6,7 @@ from routes.main import bp as main_bp
 from routes.api import bp as api_bp
 from routes.api_test import bp as api_test_bp
 
-VERSION = "1.0.78"
+VERSION = "1.0.79"
 
 app = Flask(__name__, template_folder="templates", static_folder="static")
 app.config["NUBES_API_ENDPOINT"] = os.getenv("NUBES_API_ENDPOINT", "https://lk-api-gateway-dev.ngcloud.ru/api/v1/svc")
diff --git a/site/routes/api_test.py b/site/routes/api_test.py
index 85b2206..c0ff371 100644
--- a/site/routes/api_test.py
+++ b/site/routes/api_test.py
@@ -1,6 +1,7 @@
 from flask import Blueprint, current_app, jsonify, request
 import uuid
-import collections
+import os
+import fcntl
 
 from api.http_client import HttpClient, detect_endpoint
 from operations.get_services import get_services, get_service_detail
@@ -12,14 +13,33 @@ bp = Blueprint("api_test", __name__)
 
 AUTOTEST_PREFIX = "autotest-"
 
-# Кольцевой буфер логов (показываются в UI)
-_log_lines = collections.deque(maxlen=200)
+LOG_FILE = "/tmp/app-autotest.log"
+MAX_LOG_SIZE = 512 * 1024  # 512 KB — ротация
+MAX_LOG_LINES = 200  # сколько отдавать в /api/log
 
 
 def _log(msg):
-    """Пишет и в stdout (для gunicorn), и в буфер (для UI)."""
+    """Пишет в stdout (gunicorn) и в файл (UI-панель, общий для всех воркеров)."""
     print(msg, flush=True)
-    _log_lines.append(msg)
+    try:
+        with open(LOG_FILE, "a") as f:
+            fcntl.flock(f, fcntl.LOCK_EX)
+            f.write(msg + "\n")
+            fcntl.flock(f, fcntl.LOCK_UN)
+        # Ротация если разросся
+        st = os.stat(LOG_FILE)
+        if st.st_size > MAX_LOG_SIZE:
+            with open(LOG_FILE, "r+") as f:
+                fcntl.flock(f, fcntl.LOCK_EX)
+                f.seek(st.st_size // 2)
+                f.readline()  # доесть строку
+                rest = f.read()
+                f.seek(0)
+                f.truncate()
+                f.write(rest)
+                fcntl.flock(f, fcntl.LOCK_UN)
+    except Exception:
+        pass  # молча — не ронять запрос из-за лога
 
 
 def _with_prefix(name):
@@ -338,8 +358,17 @@ def api_test_status(op_uid):
 
 @bp.route("/api/log")
 def api_log():
-    """Отдать последние строки лога для UI-панели."""
-    return jsonify(list(_log_lines))
+    """Отдать последние MAX_LOG_LINES строк лога для UI-панели."""
+    try:
+        with open(LOG_FILE, "r") as f:
+            fcntl.flock(f, fcntl.LOCK_SH)
+            lines = f.readlines()
+            fcntl.flock(f, fcntl.LOCK_UN)
+        return jsonify([l.rstrip("\n") for l in lines[-MAX_LOG_LINES:]])
+    except FileNotFoundError:
+        return jsonify([])
+    except Exception:
+        return jsonify([])
 
 
 def _find_uid(resp):