Fix logger creating many thread locks

We call getLogger for each integration to get the current
log level when loading the integrations page. This creates
a storm of threading locks

homeassistant/components/logger/helpers.py

@@ -5,6 +5,7 @@ from collections import defaultdict
 from collections.abc import Mapping
 import contextlib
 from dataclasses import asdict, dataclass
+from functools import lru_cache
 import logging
 from typing import Any, cast
 
@@ -216,3 +217,11 @@ class LoggerSettings:
                 )
 
         return dict(combined_logs)
+
+
+get_logger = lru_cache(maxsize=256)(logging.getLogger)
+"""Get a logger.
+
+getLogger uses a threading.RLock, so we cache the result to avoid
+locking the threads every time the integrations page is loaded.
+"""

homeassistant/components/logger/websocket_api.py

@@ -1,5 +1,4 @@
 """Websocket API handlers for the logger integration."""
-import logging
 from typing import Any
 
 import voluptuous as vol
@@ -16,6 +15,7 @@ from .helpers import (
     LogPersistance,
     LogSettingsType,
     async_get_domain_config,
+    get_logger,
 )
 
 
@@ -38,7 +38,7 @@ def handle_integration_log_info(
         [
             {
                 "domain": integration,
-                "level": logging.getLogger(
+                "level": get_logger(
                     f"homeassistant.components.{integration}"
                 ).getEffectiveLevel(),
             }