env：Django 4.1.3 drf 3.14.0 psycopg2 2.9.5 postgres 14.7 gunicorn 21.2.0 eventlet 0.33.3
我对django框架进行了基本的压力测试，我的观点如下

class HealthCheckView(APIView):
    def get(self, request, *args, **kwargs):
        try:
            Role.objects.filter().count()
        except Exception as e:
            return Response(status=499)
        return Response(status=status.HTTP_200_OK)

我使用以下命令启动Web服务：
gunicorn myapp.wsgi：application -c myapp/settings/gunicorn.conf.py
gunicorn.conf.py内容如下：

bind = f'0.0.0.0:{GUNICORN_PORT}'
worker_class = 'eventlet'
workers = 6

然后我使用ab工具进行压力测试：
AB -N 10000 -C 500 https://10.30.7.7/api/v1/healthz/

并发数为500时，效果较好
当我继续增加并发请求数量时，其中一些请求无法连接到数据库。

django.db.utils.OperationalError: could not connect to server: Cannot assign requested address
        Is the server running on host "10.30.7.7" and accepting
        TCP/IP connections on port 5432?

数据库配置文件如下：

max_connections = 4096
shared_buffers = 16GB
effective_cache_size = 48GB
maintenance_work_mem = 2GB
checkpoint_completion_target = 0.9
wal_buffers = 16MB
default_statistics_target = 100
random_page_cost = 4
effective_io_concurrency = 2
work_mem = 1MB
huge_pages = try
min_wal_size = 1GB
max_wal_size = 4GB
max_worker_processes = 20
max_parallel_workers_per_gather = 4
max_parallel_workers = 20
max_parallel_maintenance_workers = 4

我应该如何进行调查？
减少并发请求的数量可以避免问题，但500个并发请求显然不多。与此同时，我还尝试使用Docker部署数据库，并使用源代码编译和安装数据库。当并发性很高时会出现此问题。