Blog

Notes on monitoring

Occasional, practical writing about uptime, alerting and the ways systems fail quietly. No news, no product announcements — those live in the changelog.

August 14, 20268 min read

How to monitor cron jobs (and why they fail silently)

A cron job that stops running produces no error and no output. Here is why that happens, and how heartbeat monitoring catches it.

Read the article

July 29, 20267 min read

What 99.9% uptime actually allows

Every extra nine costs roughly ten times more. Here is the downtime each one permits, and why the number on the SLA is rarely the number that matters.

Read the article

July 17, 20266 min read

Email, Slack, SMS or webhook: choosing an alert channel

The channel decides whether an alert wakes someone or joins a backlog nobody reads. A practical comparison, including when each one fails.

Read the article