Learn and troubleshoot

Monitoring guides

What Is Website Uptime?

Understand uptime percentages, check intervals, missing data and what a healthy response really means.

Set up meaningful checks, verify notifications and use incident evidence to troubleshoot outages.

Check certificate dates and trust, then verify renewal before the next deadline.

Understand what SPF authorizes and how to investigate missing or duplicate records.

Learn how DMARC combines alignment, published policy and message-level authentication.

Use receiver evidence to distinguish missing policy, authentication failure and alignment problems.

Detect missed backup, ETL and scheduled-task completions with a private heartbeat URL.

Choose expected HTTP responses and assertions that match the endpoint you are testing.

Watch meaningful DNS records while understanding resolver caching and expected changes.

A practical checklist for website, network, certificate, domain and scheduled-job reliability.

Learn how external checks, confirmation and recovery turn website failures into actionable incidents.

Separate DNS, TLS, TTFB and transfer timing, set useful thresholds and investigate slow responses.

Understand DKIM selectors, diagnose missing keys and verify message signatures without confusing DNS lookup with delivery proof.

Choose API health assertions, chain bounded requests safely and diagnose authentication or response failures.

Detect missed scheduled work with completion signals, grace periods and practical failure diagnosis.

Check registry expiry dates, registrar renewal settings and the limits of public registration data.

Understand contractual SLAs, operational SLO targets and duration-based error budgets with worked examples.

Choose public components, write useful incident updates and separate operational evidence from communication.

Use confirmation, dependencies and bounded escalation to make monitoring alerts easier to act on.