https://tonym.us/category/monitoring.html Recent content in Monitoring on Tony Metzidis Hugo en-us Wed, 15 Apr 2026 00:00:00 +0000 https://tonym.us/testing-google-cloud-alerting.html Wed, 15 Apr 2026 00:00:00 +0000 https://tonym.us/testing-google-cloud-alerting.html <p>Testing alerting in Google Cloud Monitoring requires a proactive approach, especially with uncommon scenarios. For assertions that almost always pass—such as DNS record verification or health checks—you can simulate failures using synthetic log injection.</p> <h3 id="the-alerting-signal-assertion_passed-false">The Alerting Signal: <code>assertion_passed: false</code></h3> <p>At the heart of this strategy is a convention: services perform their internal checks and log a JSON payload with an <code>assertion_passed</code> boolean. When a check fails—be it a DNS mismatch or a stale cache—the service logs <code>{&quot;assertion_passed&quot;: false}</code>.</p>