uptime-kuma
A web-based website monitoring tool
It can detect website online status and SSL certificates
It can combine with dozens of notification methods to provide alerts
GitHub address
https://github.com/louislam/uptime-kuma
Docker IAMGES
https://hub.docker.com/r/louislam/uptime-kuma

Docker configuration
docker-compose.yml
Remember that the uptime version used in this article is fixed at version 2.
version: "3.0"
services:
uptime-kuma:
image: louislam/uptime-kuma:2
container_name: uptime-kuma
volumes:
- ./data/:/app/data
ports:
- 3779:3001
restart: always
tips
For details on adding the website and checking the SSL certificate, please refer to the video demonstration.
I won’t go into the specific details here.
I haven’t had time to set up notification messages yet.
I’m mainly checking several WordPress blogs to avoid being unaware of disconnections or expired SSL certificates.
WordPress has been frequently disconnecting these past few days.