The Webalert Blog
Expert insights on website monitoring, uptime optimization, SSL management, and building trust with status pages.
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Network Jitter Explained: Causes, Measurement & Monitoring
What jitter is, why it breaks VoIP, video and gaming, how it's measured, acceptable thresholds, and how to monitor it alongside latency and packet loss.
May 31, 2026
6 min read
4xx Errors Explained: 400, 401, 403, 404, 429 & Fixes
What 400, 401, 403, 404 and 429 really mean, what causes each, which 4xx spikes should page you at 3am, and how to monitor them before Google notices.
May 30, 2026
10 min read
Cloud SLAs Compared: What AWS, Azure & GCP Actually Guarantee
Compare AWS, Azure and GCP uptime SLAs — what 99.9%, 99.95% and 99.99% really guarantee, how service credits work, and why the SLA is not your real uptime.
May 30, 2026
9 min read
RTO vs RPO Explained: Setting Disaster Recovery Objectives
RTO vs RPO made clear — what each means, how they differ, how to calculate them, how they relate to MTD, MTTR and backups, and how monitoring protects both.
May 30, 2026
9 min read
Apdex Score Explained: Calculation, T Threshold & Pitfalls
Apdex compresses latency into one 0-1 score: (satisfied + tolerating/2) / total. Learn to set the T threshold, what 0.85 means, and when Apdex misleads.
May 29, 2026
8 min read
HTTP/3 & QUIC Monitoring: What Changes and What to Watch
How HTTP/3 and QUIC change monitoring: UDP 443, 0-RTT, connection migration, fallback to HTTP/2, and the new failure modes and metrics you must watch.
May 29, 2026
9 min read
Latency Percentiles Explained: p50, p95, p99 & p99.9
p99 is the latency your slowest 1% of users hit. Learn why averages hide outages, how to set SLOs on p95 and p99, and how to alert without noise.
May 29, 2026
9 min read
ActiveRecord Monitoring: N+1, Slow Queries & Pool Exhaustion
Detect ActiveRecord N+1 queries, slow SQL and pool exhaustion in Rails. Bullet, Prosopite, pg slow logs, Sidekiq pool sizing, and HTTP latency as canary.
May 28, 2026
13 min read
AI Crawler Monitoring: GPTBot, ClaudeBot & PerplexityBot
The 2026 playbook for AI crawler traffic: identify GPTBot, ClaudeBot, PerplexityBot and more by user agent and IP, set robots.txt rules, and alert on spikes.
May 28, 2026
13 min read
Real User Monitoring (RUM) Explained: How It Works & When to Use It
RUM explained from first principles: what it measures, how it captures Core Web Vitals, beacons, sampling, privacy, when to use it and when synthetic wins.
May 28, 2026
13 min read
5xx Server Errors Explained: 500, 502, 503, 504 Fix Guide
Diagnose and fix HTTP 5xx server errors. What 500, 502, 503, 504 and Cloudflare 520-526 mean, common causes per code, and how to monitor each.
May 27, 2026
16 min read
Is My Website Down? How to Check From Outside in 60 Seconds
Find out if your website is really down or only down for you. Step-by-step external checks: DNS, ping, multi-region, third-party tools, and what to do next.
May 27, 2026
12 min read