Monitor
Magento monitor for the Varnish HIT-ratio drop overnight, the Redis flush that tipped TBT on /checkout, and the PHP-version bump that broke a module.
A Magento store rarely goes hard-down. It goes wrong-on-checkout because a Varnish HIT-ratio dropped overnight and the origin tip now serves uncached HTML, ballooning TBT past four seconds. SiteGuardian watches the URLs a buyer types, on a minute cadence, before the next deploy or cache flush tips /checkout above threshold.
- Watches your Magento storefront, /cart, /checkout, and admin login as separate URLs.
- Tight slow threshold on /checkout. 1.5 seconds is sane — most stores accept getting close under Varnish HIT.
- Probes every minute on Pro. Fast enough to catch the Varnish HIT-ratio drop overnight.
- SSL expiry alerts on every plan. A certificate problem on a Magento custom domain is a silent breakage.
- No Magento module install, no app/etc/env.php edit, no Varnish purge call.
How it works
Setup, in three beats.
Step 01
Add the URL a paying shopper types first
Paste your Magento storefront root, /cart, /checkout, and the admin login. Set a tight slow threshold on /checkout (1.5 seconds is sane) and a slightly looser one on /cart. SiteGuardian starts probing inside the next minute, no Magento module install required.
Step 02
Let the alerts catch the Varnish-HIT-ratio drop day
Most Magento slowdowns come from a deploy that bumped module counts, a Redis flush out of schedule, or a Varnish HIT-ratio drop overnight because the cache warmed on stale tags. The minute cadence catches the day the change happened, before New Relic shows the response-time spike at 9 AM.
Step 03
Catch the cache-flush slowdown before the checkout conversion drops
A /checkout that returns 200 but takes nine seconds because Varnish cold-missed overnight is the worst kind of Magento failure. SiteGuardian catches the same minute it happens, with one short email naming the URL, the new TTFB, and the prior-day baseline.
What the alert actually says
One email. One URL. One timestamp.
Your URL https://yourstore.com/checkout answered slowly at 9,420ms (your threshold is 1,500ms) at 09:14 UTC, immediately after a varnishadm ban.url / tag purge.Frequently asked
The magento monitor questions, answered flat.
Frequently asked
Related reading
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Starter is $19 a month — one site, ten URLs, every-five-minute checks. Pro is $39 a month — three sites, fifty URLs, every-minute checks. Lifetime is $299 paid once and stays yours with every future update included.
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