General

I use pushover.net for all of my lightweight notifications - it's simple, reliable, cheap and very good so fits well with updown.io :) At its simplest, integration takes the form of an API call with a couple of tokens and a customised message. https://pushover.net/faq#technical-ips

iOS app with push notifications

How about having a dark theme? I find it a bit aggressive to the eyes after few minutes. Having a toggle button and choose between original or website in a dark theme would be amazing!

Teams aka multiple users per account

Allow maintenance window for planned IT job (server down)

Longer history than 30 days would be excellent for troubleshooting performance issues.

Having a blacklist monitor to check for IP / domain / mail blacklisting would be great. Some big web companies are hosting thousand of users and shared IPs are regularly blacklisted due to phishing or malware distribution. Similar services: https://www.site24x7.com/tools/blacklist-check.html https://www.inmotionhosting.com/support/tools/blacklist-check/

Right now, Let's Encrypt certificate expiration alert is sent 14 days, 7 days, 1 day before. I have a certbot that renews it 5 days before. So every month, I receive alerts 14 days and 7 days for all domains, which are perfectly normal. Hence, some 'alert noise' that I don't take into account anymore... Suggestion: Let us select a custom period for SSL expiration dates. I think globally, with 2 different settings: one for "standard" certificate, the other for 'let's encrypt' certificates. --> only alert when worth alerting :) --> smarter monitoring

Similar to https://status.status.io/pages/history/51f6f2088643809b7200000d

The idea is to add an option to create an alert if a port is opened (and not closed as usual). The goal is to detect firewall misconfiguration. For example, monitor the port SSH 22. If the port is accessible, trigger an alert.