Add SSL Certificate checks for General TCP ports

[throwabird]

⚠️ Please verify that this feature request has NOT been suggested before.

• I checked and didn't find similar feature request

🏷️ Feature Request Type

New Notification, New Monitor

🔖 Feature description

Say you have an application running on a TCP port using an SSL Certificate that will expire eventually.
You want to have notifications for the certificate expiry (as is possible with HTTPS currently).

Usecases

IMAP on Port 993

openssl s_client -connect imap.gmail.com:993

SMTP starttls checks on Port 25

openssl s_client -starttls smtp smtp.gmail.com:25

✔️ Solution

I propose Uptime Kuma adds (optional) SSL certificate monitoring for the TCP Port Monitor which might use similar functionality as described above.

❓ Alternatives

No response

📝 Additional Context

Trying to add expiry notifications for my mail server certificate.

[CommanderStorm]

@Techssh as mentioned above:

Please refrain from posting +1 / requests for updates things on issues, as this makes issue-management harder. Issues are for discussing what needs to be done how by whom. We use 👍🏻 on issues to prioritise work, as always: Pull Requests welcome.

We would be open to such contributions.
See our contribution guide and dns.js