Everything with an address.
One monitor per thing that can break, one timeline for what will break and what is broken, and nothing to install.
What gets watched
Uptime monitoringHTTP · TCP
Websites, APIs and anything that answers on a port, checked every minute from up to four places, with a failure confirmed before anyone is paged.FreeProBusinessCertificate monitoringCERT
Every certificate hostnag can reach is watched for expiry and a swapped chain; the ones it cannot reach get a URL to report to instead.FreeProBusinessDomain monitoringDOMAIN
Every domain's registration watched for lapsing, plus who holds the nameservers and whether DNSSEC is still switched on.FreeProBusinessDNS monitoringDNS
The records that point people and mail at your systems, watched for drift from the answer you told hostnag to expect.FreeProBusinessMail health monitoringMAIL
The records that keep mail deliverable, plus every sending address checked against the blocklists that actually get you rejected.FreeProBusinessLink monitoringLINK
An office or ISP connection watched from both ends, so a filtered port and a dead line never read the same.FreeProBusinessHeartbeat monitoringHEARTBEAT
A minted URL for anything that runs on its own schedule: a job that goes quiet becomes an alert, not a surprise weeks later.FreeProBusinessCertificate transparency watchCT WATCH
Every certificate anyone issues for your domain, watched in the public logs before you'd otherwise hear about it.FreeProBusinessAlerting and status pagesALERTS
Every alert routed to the right channel at the right severity, held during quiet hours and maintenance, escalated until it's acknowledged.FreeProBusinessAdd a host. Hear about it first.
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