Blog
Practical advice, incident post-mortems and how-tos on keeping servers, SSL certificates and domains healthy - written by the team behind ServerInspector.
Your site can be 'up' but key flows like login or checkout are broken. Learn how to implement transactional monitoring to script and validate multi-step user journeys, catching business-critical outages that simple checks miss.
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Webhooks from services like Stripe or GitHub are critical. Learn how to build resilient webhook handlers, monitor their uptime, and implement strategies like idempotency and retry queues to ensure you never miss a critical event.
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Your site can be 'up' but still insecure. Learn how to use uptime monitoring checks to enforce security headers like Content-Security-Policy (CSP), HSTS, and others to prevent silent security regressions.
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Your service relies on external APIs for payments, email, or auth. When they go down, you go down. Learn a multi-layered strategy to monitor third-party dependencies and avoid being the last to know.
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Go beyond basic requests. Master advanced `curl` commands for debugging web services, analyzing performance, and troubleshooting SSL/TLS issues. A practical guide for any developer or SRE.
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Go beyond basic uptime. Learn why monitoring DNS records like MX, TXT, and CNAME is crucial for email delivery, security, and service reliability. This guide shows you how.
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A 200 OK from one location is a dangerous blind spot. Learn to build a multi-region monitoring strategy to detect CDN issues, network problems, and regional cloud outages.
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A 200 OK status isn't enough. Learn how keyword monitoring (or content matching) detects 'soft' outages, defacement, and errors that simple uptime checks miss.
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Go beyond basic HTTP checks. Learn why TCP port monitoring is essential for services like databases, mail servers, and SSH. This guide covers how it works and what to monitor.
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Prevent silent failures in your background tasks. Learn how to implement cron job monitoring using heartbeat checks (a.k.a. a dead man's switch) to get alerted when your jobs fail or don't run on schedule. Includes practical `curl` examples.
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Check frequency tradeoffs: 1-minute vs 5-minute monitoring intervals compared for detection time, cost, false positives, and API rate limits.
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Distinguish real outages from DNS failures like NXDOMAIN, SERVFAIL, and propagation issues using dig and clear diagnostics.
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Compare RDAP and WHOIS for domain expiry monitoring, including ccTLD quirks, registrar lock, and grace period pitfalls.
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Design a reliable /healthz endpoint: liveness vs readiness vs deep checks, dependency timeouts, caching, and security best practices.
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Learn the structure of a blameless post-mortem, how to separate root cause from contributing factors, plus a free copyable markdown template.
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Know which HTTP status codes should page you: 401, 403, 429, and the 5xx class, plus how to handle redirects and health endpoints.
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A lightweight incident response playbook for small engineering teams: roles, severity matrix, comms cadence, and a first-15-minutes checklist.
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Learn to monitor SSL certificate expiry automatically with openssl, cron scripts, and alerting to avoid outages from expired certs.
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Learn API monitoring best practices: status and JSON body assertions, API key and OAuth2 auth, chained requests, and check scheduling.
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Cut noisy pages with confirmation checks, flap detection, severity tiers, and deduplication so on-call engineers trust every alert again.
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Understand core server monitoring metrics: availability, latency percentiles, error rate, saturation, and cert/domain expiry.
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Decode SSL/TLS errors like NET::ERR_CERT_*, hostname mismatch, and OCSP failures with diagnostic commands and fast fixes.
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Learn what components, update cadence, and wording build trust on a status page during an outage, plus custom domain hosting best practices.
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Synthetic monitoring vs real user monitoring (RUM) compared: strengths, blind spots, and how to combine both for complete uptime visibility.
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Uptime SLA math explained: convert 99.9% vs 99.99% into real downtime budgets, define SLO/SLA/SLI, and calculate service credits correctly.
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Uptime monitoring explained: how HTTP, TCP, keyword and ping synthetic checks work across regions, intervals and retries to detect real outages.
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