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How to monitor the things that break quietly

Step-by-step guides to monitoring cron jobs, certificates, client sites, status pages and sign-in flows.

Cron job monitoringSSL expiry alertsClient websitesStatus page on your domainLogin and checkout checksDNS record monitoringAPI endpoint monitoringOn-call for a small teamIncident postmortemsTCP port monitoringMaintenance windowsA status page people trustCutting alert noise
Start here · Catch silent failures · 5 min readCron job monitoring

How to monitor a cron job and get alerted when it does not run

Give each scheduled job a URL to call when it finishes, and get an alert when the call is late, missing, or reports a failure.

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Three pings arrive one interval apart. The fourth does not arrive. The job is late during the grace time, then missed, and the alarm is raised.pingpingpingexpectedalarmintervalintervalintervalgraceOn timeLateMissed

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Catch silent failures

The things that stop without an error: jobs, certificates, DNS.

  • 14days left

    SSL expiry alerts

    How to get alerted before an SSL certificate expires

    4 min read
  • NSns1.dnsprovider.com
    MXmx.example.com
    A203.0.113.10

    DNS record monitoring

    How to monitor DNS records and catch changes you did not make

    4 min read
  • smtp :587ok
    imap :993ok
    sftp :22failed

    TCP port monitoring

    How to monitor a database, mail server or any TCP port

    5 min read

Check what users do

A page that answers is not a product that works.

  • 1 Go to URLpassed
    2 Fill fieldpassed
    3 Clickpassed
    4 Expect URLfailed

    Login and checkout checks

    How to check that a login or checkout flow still works

    4 min read
  • GET /health200
    "status":"ok"found
    latency182 ms

    API endpoint monitoring

    How to monitor an API endpoint, not just whether it answers

    5 min read

Run the response

Who is told, who acts, and what you learn afterwards.

  • Team chat+15mPrimary+15mSecondary

    On-call for a small team

    How to set up an on-call rotation for a small team

    4 min read
  • Triggerexpired certificate
    Detectionno alert
    Amplifierretry storm

    Incident postmortems

    How to write an incident postmortem people will read

    5 min read
  • Sat 02:00 – 03:00Scheduled
    expected alertsheld back
    the most severestill page

    Maintenance windows

    How to plan a maintenance window without a night of false alarms

    4 min read
  • Pageact now
    Notifyact today
    Recordno action

    Cutting alert noise

    How to cut alert noise so the alerts that matter get read

    4 min read

Keep customers informed

For the people who depend on you, and the clients you look after.

  • acme1 down · 2 up
    nordlicht2 up
    cafe-blau2 up

    Client websites

    How to monitor client websites as an agency

    4 min read
  • status.example.com

    Status page on your domain

    How to set up a public status page on your own domain

    4 min read
  • WebsiteOperational
    Sign-inOperational
    CheckoutDown

    A status page people trust

    How to set up a status page your customers will trust

    4 min read
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