寻求帮助调查和隔离，TIA
如果您需要其他信息（如配置值）
，请与我们联系每隔几天，从一个（已知的好）IP地址充斥我的服务器（一个非常具体的WP主页），所有响应代码都是499.
访问日志看起来像是来自Chrome，并且以每秒6次的速度进入，直到达到max_children限制，之后我必须重新启动PHP-FPM。然后很长一段时间都很安静，直到它再次发生。
PHP错误日志不显示任何内容。在此之前和期间，它实际上是空的很长时间（这很奇怪）。
我确实在我的监控服务上看到了与MySQL相关的内容，只是在它发生爆发时，但我不确定它是否与原因或症状相关或会导致499响应代码：
E_WARNING: Error while sending QUERY packet. PID=2990
in mysqli_query called at /wp-includes/wp-db.php (1931)
…pdb::_do_query called at /wp-includes/
wp-db.php (1820)
in wpdb::query called at /wp-includes/wp-db.php (2420)
…wpdb::get_row called at /wp-includes/
option.php (98)
…/wp-content/plugins/wp-user-avatar/includes/
wpua-globals.php (45)
…ww/html/wp-content/plugins/wp-user-avatar/
wp-user-avatar.php (77)
…ww/html/wp-content/plugins/wp-user-avatar/
wp-user-avatar.php (33)
…ww/html/wp-content/plugins/wp-user-avatar/
wp-user-avatar.php (97)
in include_once called at /wp-settings.php (305)
in require_once called at /wp-config.php (119)
in require_once called at /wp-load.php (37)
in require_once called at /wp-blog-header.php (13)
in require called at /index.php (17)
我找不到这个：（